7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
0.974 High
EPSS
Percentile
99.9%
The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
An integer overflow flaw was found in the way the Linux kernel’s networking subsystem processed TCP Selective Acknowledgment (SACK) segments. While processing SACK segments, the Linux kernel’s socket buffer (SKB) data structure becomes fragmented. Each fragment is about TCP maximum segment size (MSS) bytes. To efficiently process SACK blocks, the Linux kernel merges multiple fragmented SKBs into one, potentially overflowing the variable holding the number of segments. A remote attacker could use this flaw to crash the Linux kernel by sending a crafted sequence of SACK segments on a TCP connection with small value of TCP MSS, resulting in a denial of service (DoS). (CVE-2019-11477)
kernel: race condition in snd_seq_write() may lead to UAF or OOB-access (CVE-2018-7566)
kernel: Race condition in sound system can lead to denial of service (CVE-2018-1000004)
Kernel: tcp: excessive resource consumption while processing SACK blocks allows remote denial of service (CVE-2019-11478)
Kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of service (CVE-2019-11479)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Bug Fix(es):
Mistmach between ‘tty->termios->c_lflag’ and ‘ldata->icanon’ for ‘ICANON’ (BZ#1708061)
RHEL7: rwsem reader/writer mutual exclusion guarantee may not work (BZ#1709702)
hardened usercopy is causing crash (BZ#1712311)
[RHEL7] md_clear flag missing from /proc/cpuinfo on late microcode update (BZ#1712991)
[RHEL7] MDS mitigations are not enabled after double microcode update (BZ#1712996)
WARNING: CPU: 0 PID: 0 at kernel/jump_label.c:90 __static_key_slow_dec+0xa6/0xb0 (BZ#1713002)
[debug kernel] [x86_64]INFO: possible circular locking dependency detected (BZ#1715326)
RHEL-7.7: tty: termios_rwsem possible deadlock (BZ#1715329)
Enhancement(s):
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
RedHat | 7 | s390x | python-perf-debuginfo | < 3.10.0-693.50.3.el7 | python-perf-debuginfo-3.10.0-693.50.3.el7.s390x.rpm |
RedHat | 7 | ppc64le | kernel | < 3.10.0-693.50.3.el7 | kernel-3.10.0-693.50.3.el7.ppc64le.rpm |
RedHat | 7 | s390x | kernel | < 3.10.0-693.50.3.el7 | kernel-3.10.0-693.50.3.el7.s390x.rpm |
RedHat | 7 | ppc64 | kernel-debuginfo | < 3.10.0-693.50.3.el7 | kernel-debuginfo-3.10.0-693.50.3.el7.ppc64.rpm |
RedHat | 7 | ppc64 | kernel | < 3.10.0-693.50.3.el7 | kernel-3.10.0-693.50.3.el7.ppc64.rpm |
RedHat | 7 | s390x | python-perf | < 3.10.0-693.50.3.el7 | python-perf-3.10.0-693.50.3.el7.s390x.rpm |
RedHat | 7 | ppc64 | kernel-debug-debuginfo | < 3.10.0-693.50.3.el7 | kernel-debug-debuginfo-3.10.0-693.50.3.el7.ppc64.rpm |
RedHat | 7 | ppc64 | kernel-tools | < 3.10.0-693.50.3.el7 | kernel-tools-3.10.0-693.50.3.el7.ppc64.rpm |
RedHat | 7 | s390x | perf-debuginfo | < 3.10.0-693.50.3.el7 | perf-debuginfo-3.10.0-693.50.3.el7.s390x.rpm |
RedHat | 7 | x86_64 | perf | < 3.10.0-693.50.3.el7 | perf-3.10.0-693.50.3.el7.x86_64.rpm |
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
0.974 High
EPSS
Percentile
99.9%