## Releases
* Ubuntu 14.04 ESM
## Packages
* linux \- Linux kernel
Alexander Popov discovered that the N_HDLC line discipline implementation
in the Linux kernel contained a double-free vulnerability. A local attacker
could use this to cause a denial of service (system crash) or possibly gain
administrative privileges.
{"thn": [{"lastseen": "2018-01-27T09:17:15", "description": "[](<https://4.bp.blogspot.com/-cNY4GF7b-4k/WMq0sCwyxvI/AAAAAAAAr0g/zJMbacrkhsw-FQoVkI9bUZgXa-pB-QrWACLcB/s1600/linux-kernel-double-free-vulnerability.png>)\n\nAnother dangerous vulnerability has been discovered in Linux kernel that dates back to 2009 and affects a large number of Linux distros, including Red Hat, Debian, Fedora, OpenSUSE, and Ubuntu. \n \nThe latest Linux kernel flaw ([CVE-2017-2636](<http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-2636>)), which existed in the Linux kernel for the past seven years, allows a local unprivileged user to gain root privileges on affected systems or cause a denial of service (system crash). \n \nPositive Technologies researcher Alexander Popov discovered a race condition issue in the N_HLDC Linux kernel driver \u2013 which is responsible for dealing with High-Level Data Link Control (HDLC) data \u2013 that leads to double-free vulnerability. \n \n\u201c**Double Free**\u201d is one of the most common memory corruption bug that occurs when the application releases same memory location twice by calling the free() function on the same allocated memory. \n \nAn unauthenticated attacker may leverage this vulnerability to inject and execute arbitrary code in the security context of currently logged in user. \n \nThe vulnerability affects the majority of popular Linux distributions including [Red Hat Enterprise Linux 6, 7](<https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2636>), [Fedora](<https://bugzilla.redhat.com/show_bug.cgi?id=1430049>), [SUSE](<https://bugzilla.novell.com/show_bug.cgi?id=CVE-2017-2636>), [Debian](<https://security-tracker.debian.org/tracker/CVE-2017-2636>), and [Ubuntu](<https://people.canonical.com/~ubuntu-security/cve/2017/CVE-2017-2636.html>). \n \nSince the flaw dates back to June 2009, Linux enterprise servers and devices have been vulnerable for a long time, but according to Positive Technologies, it is hard to say whether this vulnerability has actively been exploited in the wild or not. \n\n\n> \"The vulnerability is old, so it is widespread across Linux workstations and servers,\" [says](<https://www.ptsecurity.com/ww-en/about/news/199636/>) Popov. \"To automatically load the flawed module, an attacker needs only unprivileged user rights. Additionally, the exploit doesn't require any special hardware.\"\n\nThe researcher detected the vulnerability during system calls testing with the syzkaller fuzzer, which is a security code auditing software developed by Google. \n \nPopov then reported the flaw to kernel.org on February 28, 2017, along with the exploit prototype, as well as provided the patch to fix the issue. \n \nThe vulnerability has already been patched in the Linux kernel, and the security updates along with the vulnerability details were [published](<http://seclists.org/oss-sec/2017/q1/569>) on March 7. \n \nSo, users are encouraged to install the latest security updates as soon as possible, but if unable to apply the patch, the researcher advised blocking the flawed module (n_hdlc) manually to safeguard enterprise as well as home use of the operating system.\n", "cvss3": {}, "published": "2017-03-16T04:54:00", "type": "thn", "title": "Linux Kernel Gets Patch For Years-Old Serious Vulnerability", "bulletinFamily": "info", "cvss2": {}, "cvelist": ["CVE-2017-2636"], "modified": "2017-03-16T15:54:33", "id": "THN:FA88848EF7446185D7481A0AB338ACA7", "href": "https://thehackernews.com/2017/03/linux-kernel-vulnerability.html", "cvss": {"score": 7.2, "vector": "AV:LOCAL/AC:LOW/Au:NONE/C:COMPLETE/I:COMPLETE/A:COMPLETE/"}}], "archlinux": [{"lastseen": "2023-06-23T14:58:24", "description": "Arch Linux Security Advisory ASA-201703-7\n=========================================\n\nSeverity: Low\nDate : 2017-03-13\nCVE-ID : CVE-2017-2636\nPackage : linux-grsec\nType : privilege escalation\nRemote : No\nLink : https://security.archlinux.org/AVG-201\n\nSummary\n=======\n\nThe package linux-grsec before version 1:4.9.14.r201703121245-1 is\nvulnerable to privilege escalation.\n\nResolution\n==========\n\nUpgrade to 1:4.9.14.r201703121245-1.\n\n# pacman -Syu \"linux-grsec>=1:4.9.14.r201703121245-1\"\n\nThe problem has been fixed upstream in version 4.9.14.r201703121245.\n\nWorkaround\n==========\n\n# echo \"install n_hdlc /bin/true\" >> /etc/modprobe.d/disable-\nn_hdlc.conf\n\nDescription\n===========\n\nA race condition flaw was found in the N_HLDC Linux kernel driver when\naccessing the n_hdlc.tbuf list that can lead to double free. A local,\nunprivileged user able to set the HDLC line discipline on the tty\ndevice could use this flaw to crash the system or increase their\nprivileges on the system.\n\nImpact\n======\n\nA local attacker is able to escalate privileges or crash the system if\nthe n_hdlc kernel module has already been explicitly loaded by an\nadministrator.\n\nReferences\n==========\n\nhttps://bugs.archlinux.org/task/53242\nhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=82f2341c94d270421f383641b7cd670e474db56b\nhttp://seclists.org/oss-sec/2017/q1/569\nhttps://security.archlinux.org/CVE-2017-2636", "cvss3": {"exploitabilityScore": 1.0, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "baseScore": 7.0, "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2017-03-13T00:00:00", "type": "archlinux", "title": "[ASA-201703-7] linux-grsec: privilege escalation", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 3.4, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "baseScore": 6.9, "vectorString": "AV:L/AC:M/Au:N/C:C/I:C/A:C", "version": "2.0", "accessVector": "LOCAL", "authentication": "NONE"}, "impactScore": 10.0, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2017-2636"], "modified": "2017-03-13T00:00:00", "id": "ASA-201703-7", "href": "https://security.archlinux.org/ASA-201703-7", "cvss": {"score": 6.9, "vector": "AV:L/AC:M/Au:N/C:C/I:C/A:C"}}, {"lastseen": "2023-06-23T14:58:23", "description": "Arch Linux Security Advisory ASA-201703-6\n=========================================\n\nSeverity: High\nDate : 2017-03-12\nCVE-ID : CVE-2017-2636\nPackage : linux-lts\nType : privilege escalation\nRemote : No\nLink : https://security.archlinux.org/AVG-200\n\nSummary\n=======\n\nThe package linux-lts before version 4.9.14-1 is vulnerable to\nprivilege escalation.\n\nResolution\n==========\n\nUpgrade to 4.9.14-1.\n\n# pacman -Syu \"linux-lts>=4.9.14-1\"\n\nThe problem has been fixed upstream in version 4.9.14.\n\nWorkaround\n==========\n\n# echo \"install n_hdlc /bin/true\" >> /etc/modprobe.d/disable-\nn_hdlc.conf\n\nDescription\n===========\n\nA race condition flaw was found in the N_HLDC Linux kernel driver when\naccessing the n_hdlc.tbuf list that can lead to double free. A local,\nunprivileged user able to set the HDLC line discipline on the tty\ndevice could use this flaw to crash the system or increase their\nprivileges on the system.\n\nImpact\n======\n\nA local attacker is able to escalate privileges or crash the system.\n\nReferences\n==========\n\nhttps://bugs.archlinux.org/task/53242\nhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=82f2341c94d270421f383641b7cd670e474db56b\nhttp://seclists.org/oss-sec/2017/q1/569\nhttps://security.archlinux.org/CVE-2017-2636", "cvss3": {"exploitabilityScore": 1.0, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "baseScore": 7.0, "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2017-03-12T00:00:00", "type": "archlinux", "title": "[ASA-201703-6] linux-lts: privilege escalation", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 3.4, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "baseScore": 6.9, "vectorString": "AV:L/AC:M/Au:N/C:C/I:C/A:C", "version": "2.0", "accessVector": "LOCAL", "authentication": "NONE"}, "impactScore": 10.0, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2017-2636"], "modified": "2017-03-12T00:00:00", "id": "ASA-201703-6", "href": "https://security.archlinux.org/ASA-201703-6", "cvss": {"score": 6.9, "vector": "AV:L/AC:M/Au:N/C:C/I:C/A:C"}}, {"lastseen": "2023-06-23T14:58:22", "description": "Arch Linux Security Advisory ASA-201703-8\n=========================================\n\nSeverity: High\nDate : 2017-03-14\nCVE-ID : CVE-2017-2636\nPackage : linux\nType : privilege escalation\nRemote : No\nLink : https://security.archlinux.org/AVG-192\n\nSummary\n=======\n\nThe package linux before version 4.10.2-1 is vulnerable to privilege\nescalation.\n\nResolution\n==========\n\nUpgrade to 4.10.2-1.\n\n# pacman -Syu \"linux>=4.10.2-1\"\n\nThe problem has been fixed upstream in version 4.10.2.\n\nWorkaround\n==========\n\n# echo \"install n_hdlc /bin/true\" >> /etc/modprobe.d/disable-\nn_hdlc.conf\n\nDescription\n===========\n\nA race condition flaw was found in the N_HLDC Linux kernel driver when\naccessing the n_hdlc.tbuf list that can lead to double free. A local,\nunprivileged user able to set the HDLC line discipline on the tty\ndevice could use this flaw to crash the system or increase their\nprivileges on the system.\n\nImpact\n======\n\nA local attacker is able to escalate privileges or crash the system.\n\nReferences\n==========\n\nhttps://bugs.archlinux.org/task/53242\nhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=82f2341c94d270421f383641b7cd670e474db56b\nhttp://seclists.org/oss-sec/2017/q1/569\nhttps://security.archlinux.org/CVE-2017-2636", "cvss3": {"exploitabilityScore": 1.0, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "baseScore": 7.0, "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2017-03-14T00:00:00", "type": "archlinux", "title": "[ASA-201703-8] linux: privilege escalation", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 3.4, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "baseScore": 6.9, "vectorString": "AV:L/AC:M/Au:N/C:C/I:C/A:C", "version": "2.0", "accessVector": "LOCAL", "authentication": "NONE"}, "impactScore": 10.0, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2017-2636"], "modified": "2017-03-14T00:00:00", "id": "ASA-201703-8", "href": "https://security.archlinux.org/ASA-201703-8", "cvss": {"score": 6.9, "vector": "AV:L/AC:M/Au:N/C:C/I:C/A:C"}}, {"lastseen": "2023-06-23T14:58:22", "description": "Arch Linux Security Advisory ASA-201703-13\n==========================================\n\nSeverity: High\nDate : 2017-03-16\nCVE-ID : CVE-2017-2636\nPackage : linux-zen\nType : privilege escalation\nRemote : No\nLink : https://security.archlinux.org/AVG-203\n\nSummary\n=======\n\nThe package linux-zen before version 4.10.2-1 is vulnerable to\nprivilege escalation.\n\nResolution\n==========\n\nUpgrade to 4.10.2-1.\n\n# pacman -Syu \"linux-zen>=4.10.2-1\"\n\nThe problem has been fixed upstream in version 4.10.2.\n\nWorkaround\n==========\n\n# echo \"install n_hdlc /bin/true\" >> /etc/modprobe.d/disable-\nn_hdlc.conf\n\nDescription\n===========\n\nA race condition flaw was found in the N_HLDC Linux kernel driver when\naccessing the n_hdlc.tbuf list that can lead to double free. A local,\nunprivileged user able to set the HDLC line discipline on the tty\ndevice could use this flaw to crash the system or increase their\nprivileges on the system.\n\nImpact\n======\n\nA local attacker is able to escalate privileges or crash the system.\n\nReferences\n==========\n\nhttps://bugs.archlinux.org/task/53242\nhttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=82f2341c94d270421f383641b7cd670e474db56b\nhttp://seclists.org/oss-sec/2017/q1/569\nhttps://security.archlinux.org/CVE-2017-2636", "cvss3": {"exploitabilityScore": 1.0, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "attackComplexity": "HIGH", "scope": "UNCHANGED", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "baseScore": 7.0, "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 5.9}, "published": "2017-03-16T00:00:00", "type": "archlinux", "title": "[ASA-201703-13] linux-zen: privilege escalation", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 3.4, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "MEDIUM", "confidentialityImpact": "COMPLETE", "availabilityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "baseScore": 6.9, "vectorString": "AV:L/AC:M/Au:N/C:C/I:C/A:C", "version": "2.0", "accessVector": "LOCAL", "authentication": "NONE"}, "impactScore": 10.0, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2017-2636"], "modified": "2017-03-16T00:00:00", "id": "ASA-201703-13", "href": "https://security.archlinux.org/ASA-201703-13", "cvss": {"score": 6.9, "vector": "AV:L/AC:M/Au:N/C:C/I:C/A:C"}}], "nessus": [{"lastseen": "2023-05-19T14:18:45", "description": "Race condition in drivers/tty/n_hdlc.c in the Linux kernel through 4.10.1 allows local users to gain privileges or cause a 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K18015201.\n#\n# The text description of this plugin is (C) F5 Networks.\n#\n\ninclude(\"compat.inc\");\n\nif (description)\n{\n script_id(99048);\n script_version(\"3.3\");\n script_cvs_date(\"Date: 2019/01/04 10:03:41\");\n\n script_cve_id(\"CVE-2017-2636\");\n\n script_name(english:\"F5 Networks BIG-IP : Linux kernel vulnerability (K18015201)\");\n script_summary(english:\"Checks the BIG-IP version.\");\n\n script_set_attribute(\n attribute:\"synopsis\", \n value:\"The remote device is missing a vendor-supplied security patch.\"\n );\n script_set_attribute(\n attribute:\"description\", \n value:\n\"Race condition in drivers/tty/n_hdlc.c in the Linux kernel through\n4.10.1 allows local users to gain privileges or cause a denial of\nservice (double free) by setting the HDLC line discipline.\n(CVE-2017-2636)\"\n );\n script_set_attribute(\n attribute:\"see_also\",\n value:\"https://support.f5.com/csp/article/K18015201\"\n );\n script_set_attribute(\n attribute:\"solution\", \n 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script_set_attribute(attribute:\"cpe\", value:\"cpe:/a:f5:big-ip_local_traffic_manager\");\n script_set_attribute(attribute:\"cpe\", value:\"cpe:/a:f5:big-ip_policy_enforcement_manager\");\n script_set_attribute(attribute:\"cpe\", value:\"cpe:/h:f5:big-ip\");\n\n script_set_attribute(attribute:\"patch_publication_date\", value:\"2017/03/28\");\n script_set_attribute(attribute:\"generated_plugin\", value:\"current\");\n script_set_attribute(attribute:\"plugin_publication_date\", value:\"2017/03/30\");\n script_end_attributes();\n\n script_category(ACT_GATHER_INFO);\n script_copyright(english:\"This script is Copyright (C) 2017-2019 and is owned by Tenable, Inc. or an Affiliate thereof.\");\n script_family(english:\"F5 Networks Local Security Checks\");\n\n script_dependencies(\"f5_bigip_detect.nbin\");\n script_require_keys(\"Host/local_checks_enabled\", \"Host/BIG-IP/hotfix\", \"Host/BIG-IP/modules\", \"Host/BIG-IP/version\", \"Settings/ParanoidReport\");\n\n 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A local attacker in an L2 guest VM can take advantage of this flaw to cause a denial of service for the L1 guest VM.\n\n - CVE-2017-2636 Alexander Popov discovered a race condition flaw in the n_hdlc line discipline that can lead to a double free. A local unprivileged user can take advantage of this flaw for privilege escalation. On systems that do not already have the n_hdlc module loaded, this can be mitigated by disabling it:echo >> /etc/modprobe.d/disable-n_hdlc.conf install n_hdlc false\n\n - CVE-2017-5669 Gareth Evans reported that privileged users can map memory at address 0 through the shmat() system call.\n This could make it easier to exploit other kernel security vulnerabilities via a set-UID program.\n\n - CVE-2017-5986 Alexander Popov reported a race condition in the SCTP implementation that can be used by local users to cause a denial-of-service (crash). The initial fix for this was incorrect and introduced further security issues ( CVE-2017-6353 ). This update includes a later fix that avoids those. On systems that do not already have the sctp module loaded, this can be mitigated by disabling it:echo >> /etc/modprobe.d/disable-sctp.conf install sctp false\n\n - CVE-2017-6214 Dmitry Vyukov reported a bug in the TCP implementation's handling of urgent data in the splice() system call.\n This can be used by a remote attacker for denial-of-service (hang) against applications that read from TCP sockets with splice().\n\n - CVE-2017-6345 Andrey Konovalov reported that the LLC type 2 implementation incorrectly assigns socket buffer ownership. This can be used by a local user to cause a denial-of-service (crash). On systems that do not already have the llc2 module loaded, this can be mitigated by disabling it:echo >> /etc/modprobe.d/disable-llc2.conf install llc2 false\n\n - CVE-2017-6346 Dmitry Vyukov reported a race condition in the raw packet (af_packet) fanout feature. Local users with the CAP_NET_RAW capability (in any user namespace) can use this for denial-of-service and possibly for privilege escalation.\n\n - CVE-2017-6348 Dmitry Vyukov reported that the general queue implementation in the IrDA subsystem does not properly manage multiple locks, possibly allowing local users to cause a denial-of-service (deadlock) via crafted operations on IrDA devices.", "cvss3": {}, "published": "2017-03-09T00:00:00", "type": "nessus", "title": "Debian DSA-3804-1 : linux - security update", "bulletinFamily": "scanner", "cvss2": {}, "cvelist": ["CVE-2016-9588", "CVE-2017-2636", "CVE-2017-5669", "CVE-2017-5986", "CVE-2017-6214", "CVE-2017-6345", "CVE-2017-6346", "CVE-2017-6348", "CVE-2017-6353"], "modified": "2021-01-11T00:00:00", "cpe": ["p-cpe:/a:debian:debian_linux:linux", "cpe:/o:debian:debian_linux:8.0"], "id": "DEBIAN_DSA-3804.NASL", "href": "https://www.tenable.com/plugins/nessus/97615", "sourceData": "#%NASL_MIN_LEVEL 70300\n#\n# (C) Tenable Network Security, Inc.\n#\n# The descriptive text and package checks in this plugin were \n# extracted from Debian Security Advisory DSA-3804. The text \n# itself is copyright (C) Software in the Public Interest, Inc.\n#\n\ninclude('deprecated_nasl_level.inc');\ninclude('compat.inc');\n\nif (description)\n{\n script_id(97615);\n script_version(\"3.5\");\n script_set_attribute(attribute:\"plugin_modification_date\", value:\"2021/01/11\");\n\n script_cve_id(\"CVE-2016-9588\", \"CVE-2017-2636\", \"CVE-2017-5669\", \"CVE-2017-5986\", \"CVE-2017-6214\", \"CVE-2017-6345\", \"CVE-2017-6346\", \"CVE-2017-6348\", \"CVE-2017-6353\");\n script_xref(name:\"DSA\", value:\"3804\");\n\n script_name(english:\"Debian DSA-3804-1 : linux - security update\");\n script_summary(english:\"Checks dpkg output for the updated package\");\n\n script_set_attribute(\n attribute:\"synopsis\", \n value:\"The remote Debian host is missing a security-related update.\"\n );\n script_set_attribute(\n attribute:\"description\", \n value:\n\"Several vulnerabilities have been discovered in the Linux kernel that\nmay lead to a privilege escalation, denial of service or have other\nimpacts.\n\n - CVE-2016-9588\n Jim Mattson discovered that the KVM implementation for\n Intel x86 processors does not properly handle #BP and\n #OF exceptions in an L2 (nested) virtual machine. A\n local attacker in an L2 guest VM can take advantage of\n this flaw to cause a denial of service for the L1 guest\n VM.\n\n - CVE-2017-2636\n Alexander Popov discovered a race condition flaw in the\n n_hdlc line discipline that can lead to a double free. A\n local unprivileged user can take advantage of this flaw\n for privilege escalation. On systems that do not already\n have the n_hdlc module loaded, this can be mitigated by\n disabling it:echo >> /etc/modprobe.d/disable-n_hdlc.conf\n install n_hdlc false\n\n - CVE-2017-5669\n Gareth Evans reported that privileged users can map\n memory at address 0 through the shmat() system call.\n This could make it easier to exploit other kernel\n security vulnerabilities via a set-UID program.\n\n - CVE-2017-5986\n Alexander Popov reported a race condition in the SCTP\n implementation that can be used by local users to cause\n a denial-of-service (crash). The initial fix for this\n was incorrect and introduced further security issues (\n CVE-2017-6353 ). This update includes a later fix that\n avoids those. On systems that do not already have the\n sctp module loaded, this can be mitigated by disabling\n it:echo >> /etc/modprobe.d/disable-sctp.conf install\n sctp false\n\n - CVE-2017-6214\n Dmitry Vyukov reported a bug in the TCP implementation's\n handling of urgent data in the splice() system call.\n This can be used by a remote attacker for\n denial-of-service (hang) against applications that read\n from TCP sockets with splice().\n\n - CVE-2017-6345\n Andrey Konovalov reported that the LLC type 2\n implementation incorrectly assigns socket buffer\n ownership. This can be used by a local user to cause a\n denial-of-service (crash). On systems that do not\n already have the llc2 module loaded, this can be\n mitigated by disabling it:echo >>\n /etc/modprobe.d/disable-llc2.conf install llc2 false\n\n - CVE-2017-6346\n Dmitry Vyukov reported a race condition in the raw\n packet (af_packet) fanout feature. Local users with the\n CAP_NET_RAW capability (in any user namespace) can use\n this for denial-of-service and possibly for privilege\n escalation.\n\n - CVE-2017-6348\n Dmitry Vyukov reported that the general queue\n implementation in the IrDA subsystem does not properly\n manage multiple locks, possibly allowin
Linux kernel vulnerability
