Important: kernel security and bug fix update

Topic

An update for kernel is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: stack overflow in do_proc_dointvec and proc_skip_spaces (CVE-2022-4378)
• kernel: use-after-free related to leaf anon_vma double reuse (CVE-2022-42703)

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):

• Regression - SAS3416 card works on RHEL 7.7 and below, does not work on RHEL 7.8 or 7.9 (BZ#1974485)
• use-after-free in sctp_do_8_2_transport_strike (BZ#2054037)
• RHEL7.9 - [Regression] Kernel test failed during CPU polarization test - lscpu, chcpu - LPAR (BZ#2071980)
• RHEL 7, block: Crash in blk_mq_rq_timed_out() when dereferencing NULL request->q pointer (BZ#2088029)
• qla2xxx: Qlogic double completion races during error handling are still not fixed and this will also be a RHEL8+ exposure (BZ#2092105)
• kernel 3.10.0-1160.80.1.el7.x86_64 on Xeon E55xx crashes upon KVM startup (BZ#2143438)
• Guest's time jumped forward by 12 minutes _after_ live-migration completes (in 30 seconds) (BZ#2152838)
• RHEL7: target crashes if a malicious initiator sends a logout immediately after a login command (BZ#2154243)
• RHEL7.9 - LTP testcase creat09 fails related to 'CVE-2018-13405' and 'CVE-2021-4037` (BZ#2159946)

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Affected Products

• Red Hat Enterprise Linux Server 7 x86_64
• Red Hat Enterprise Linux Workstation 7 x86_64
• Red Hat Enterprise Linux Desktop 7 x86_64
• Red Hat Enterprise Linux for IBM z Systems 7 s390x
• Red Hat Enterprise Linux for Power, big endian 7 ppc64
• Red Hat Enterprise Linux for Scientific Computing 7 x86_64
• Red Hat Enterprise Linux for Power, little endian 7 ppc64le

Fixes

• BZ - 2054037 - use-after-free in sctp_do_8_2_transport_strike [rhel-7.9.z]
• BZ - 2133483 - CVE-2022-42703 kernel: use-after-free related to leaf anon_vma double reuse
• BZ - 2143438 - kernel 3.10.0-1160.80.1.el7.x86_64 on Xeon E55xx crashes upon KVM startup [rhel-7.9.z]
• BZ - 2152548 - CVE-2022-4378 kernel: stack overflow in do_proc_dointvec and proc_skip_spaces

CVEs

• CVE-2022-4378
• CVE-2022-42703

References

• https://access.redhat.com/security/updates/classification/#important