RHSA-2023:4821 - Security Advisory

Topic

An update for kernel-rt 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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

• kernel: cls_flower: out-of-bounds write in fl_set_geneve_opt() (CVE-2023-35788)
• hw: amd: Cross-Process Information Leak (CVE-2023-20593)

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):

• kernel-rt: update to the latest RHEL7.9.z25 source tree (BZ#2221821)

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 for Real Time 7 x86_64
• Red Hat Enterprise Linux for Real Time for NFV 7 x86_64

Fixes

• BZ - 2215768 - CVE-2023-35788 kernel: cls_flower: out-of-bounds write in fl_set_geneve_opt()
• BZ - 2217845 - CVE-2023-20593 hw: amd: Cross-Process Information Leak

CVEs

• CVE-2023-20593
• CVE-2023-35788

References

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