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):

• a use-after-free in cls_route filter implementation may lead to privilege escalation (CVE-2022-2588)
• RetBleed Arbitrary Speculative Code Execution with Return Instructions (CVE-2022-23816, CVE-2022-29900)
• Branch Type Confusion (non-retbleed) (CVE-2022-23825)
• Intel: Post-barrier Return Stack Buffer Predictions (CVE-2022-26373)
• Intel: RetBleed Arbitrary Speculative Code Execution with Return Instructions (CVE-2022-29901)

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):

• lpfc panics in lpfc_els_free_iocb() during port recovery (BZ#1969988)
• mlx5 reports error messages during shutdown then panic with mce (BZ#2077711)
• Kernel panic due to hard lockup caused by deadlock between tasklist_lock and k_itimer->it_lock (BZ#2115147)
• fix excess double put in nfs_prime_dcache (BZ#2117856)

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
• Red Hat Virtualization Host 4 for RHEL 7 x86_64

Fixes

• BZ - 2090226 - CVE-2022-23816 CVE-2022-29900 hw: cpu: AMD: RetBleed Arbitrary Speculative Code Execution with Return Instructions
• BZ - 2103148 - CVE-2022-29901 hw: cpu: Intel: RetBleed Arbitrary Speculative Code Execution with Return Instructions
• BZ - 2103153 - CVE-2022-23825 hw: cpu: AMD: Branch Type Confusion (non-retbleed)
• BZ - 2114849 - CVE-2022-2588 kernel: a use-after-free in cls_route filter implementation may lead to privilege escalation
• BZ - 2115065 - CVE-2022-26373 hw: cpu: Intel: Post-barrier Return Stack Buffer Predictions

CVEs

• CVE-2022-2588
• CVE-2022-23816
• CVE-2022-23825
• CVE-2022-26373
• CVE-2022-29900
• CVE-2022-29901

References

• https://access.redhat.com/security/updates/classification/#important
• https://access.redhat.com/solutions/6971358