## Releases
* Ubuntu 14.04 ESM
## Packages
* linux \- Linux kernel
It was discovered that the Linux kernel did not properly restrict access to
the kernel debugger when booted in secure boot environments. A privileged
attacker could use this to bypass UEFI Secure Boot restrictions.
(CVE-2022-21499)
It was discovered that a race condition existed in the network scheduling
subsystem of the Linux kernel, leading to a use-after-free vulnerability. A
local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2021-39713)
It was discovered that some Intel processors did not completely perform
cleanup actions on multi-core shared buffers. A local attacker could
possibly use this to expose sensitive information. (CVE-2022-21123)
It was discovered that some Intel processors did not completely perform
cleanup actions on microarchitectural fill buffers. A local attacker could
possibly use this to expose sensitive information. (CVE-2022-21125)
It was discovered that some Intel processors did not properly perform
cleanup during specific special register write operations. A local attacker
could possibly use this to expose sensitive information. (CVE-2022-21166)
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(CVE-2022-21123)\n\n - Incomplete cleanup of microarchitectural fill buffers on some Intel(R) Processors may allow an\n authenticated user to potentially enable information disclosure via local access. (CVE-2022-21125)\n\n - Incomplete cleanup in specific special register write operations for some Intel(R) Processors may allow an\n authenticated user to potentially enable information disclosure via local access. (CVE-2022-21166)\n\n - Aliases in the branch predictor may cause some AMD processors to predict the wrong branch type potentially\n leading to information disclosure. (CVE-2022-23825)\n\n - x86 pv: Race condition in typeref acquisition Xen maintains a type reference count for pages, in addition\n to a regular reference count. This scheme is used to maintain invariants required for Xen's safety, e.g.\n PV guests may not have direct writeable access to pagetables; updates need auditing by Xen. Unfortunately,\n the logic for acquiring a type reference has a race condition, whereby a safely TLB flush is issued too\n early and creates a window where the guest can re-establish the read/write mapping before writeability is\n prohibited. (CVE-2022-26362)\n\n - x86 pv: Insufficient care with non-coherent mappings T[his CNA information record relates to multiple\n CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Xen maintains a type\n reference count for pages, in addition to a regular reference count. This scheme is used to maintain\n invariants required for Xen's safety, e.g. PV guests may not have direct writeable access to pagetables;\n updates need auditing by Xen. Unfortunately, Xen's safety logic doesn't account for CPU-induced cache non-\n coherency; cases where the CPU can cause the content of the cache to be different to the content in main\n memory. In such cases, Xen's safety logic can incorrectly conclude that the contents of a page is safe.\n (CVE-2022-26363, CVE-2022-26364)\n\n - Mis-trained branch predictions for return instructions may allow arbitrary speculative code execution\n under certain microarchitecture-dependent conditions. (CVE-2022-29900)\n\n - insufficient TLB flush for x86 PV guests in shadow mode For migration as well as to work around kernels\n unaware of L1TF (see XSA-273), PV guests may be run in shadow paging mode. To address XSA-401, code was\n moved inside a function in Xen. This code movement missed a variable changing meaning / value between old\n and new code positions. The now wrong use of the variable did lead to a wrong TLB flush condition,\n omitting flushes where such are necessary. (CVE-2022-33745)\n\nNote that Nessus has not tested for these issues but has instead relied only on the application's self-reported version\nnumber.\");\n script_set_attribute(attribute:\"see_also\", value:\"https://bugzilla.suse.com/1199965\");\n script_set_attribute(attribute:\"see_also\", value:\"https://bugzilla.suse.com/1199966\");\n script_set_attribute(attribute:\"see_also\", value:\"https://bugzilla.suse.com/1200549\");\n script_set_attribute(attribute:\"see_also\", value:\"https://bugzilla.suse.com/1201394\");\n script_set_attribute(attribute:\"see_also\", value:\"https://bugzilla.suse.com/1201469\");\n # https://lists.suse.com/pipermail/sle-security-updates/2022-July/011700.html\n script_set_attribute(attribute:\"see_also\", value:\"http://www.nessus.org/u?a30aaeb7\");\n script_set_attribute(attribute:\"see_also\", value:\"https://www.suse.com/security/cve/CVE-2022-21123\");\n script_set_attribute(attribute:\"see_also\", value:\"https://www.suse.com/security/cve/CVE-2022-21125\");\n script_set_attribute(attribute:\"see_also\", value:\"https://www.suse.com/security/cve/CVE-2022-21166\");\n script_set_attribute(attribute:\"see_also\", value:\"https://www.suse.com/security/cve/CVE-2022-23816\");\n script_set_attribute(attribute:\"see_also\", value:\"https://www.suse.com/security/cve/CVE-2022-23825\");\n script_set_attribute(attribute:\"see_also\", value:\"https://www.suse.com/security/cve/CVE-2022-26362\");\n script_set_attribute(attribute:\"see_also\", value:\"https://www.suse.com/security/cve/CVE-2022-26363\");\n script_set_attribute(attribute:\"see_also\", value:\"https://www.suse.com/security/cve/CVE-2022-26364\");\n script_set_attribute(attribute:\"see_also\", value:\"https://www.suse.com/security/cve/CVE-2022-29900\");\n script_set_attribute(attribute:\"see_also\", value:\"https://www.suse.com/security/cve/CVE-2022-33745\");\n script_set_attribute(attribute:\"solution\", value:\n\"Update the affected packages.\");\n script_set_cvss_base_vector(\"CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C\");\n script_set_cvss_temporal_vector(\"CVSS2#E:POC/RL:OF/RC:C\");\n script_set_cvss3_base_vector(\"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H\");\n script_set_cvss3_temporal_vector(\"CVSS:3.0/E:P/RL:O/RC:C\");\n script_set_attribute(attribute:\"cvss_score_source\", value:\"CVE-2022-26364\");\n script_set_attribute(attribute:\"cvss3_score_source\", value:\"CVE-2022-33745\");\n\n script_set_attribute(attribute:\"exploitability_ease\", value:\"Exploits are available\");\n script_set_attribute
Linux kernel vulnerabilities
