RHSA-2023:3470 - Security Advisory

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 9.0 Extended Update Support.

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: net/ulp: use-after-free in listening ULP sockets (CVE-2023-0461)
• kernel: udmabuf: improper validation of array index leading to local privilege escalation (CVE-2023-2008)
• kernel: netfilter: use-after-free in nf_tables when processing batch requests can lead to privilege escalation (CVE-2023-32233)

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-debug: BUG: MAX_LOCKDEP_CHAINS too low (BZ#2181286)
• kernel-rt: update RT source tree to the latest RHEL-9.0.z9 Batch (BZ#2186491)
• kernel-rt: INFO: task deadline_test:1778 blocked for more than 622 seconds (BZ#2188662)

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 for x86_64 - 4 years of updates 9.0 x86_64
• Red Hat Enterprise Linux for Real Time for NFV for x86_64 - 4 years of updates 9.0 x86_64

Fixes

• BZ - 2176192 - CVE-2023-0461 kernel: net/ulp: use-after-free in listening ULP sockets
• BZ - 2186862 - CVE-2023-2008 kernel: udmabuf: improper validation of array index leading to local privilege escalation
• BZ - 2196105 - CVE-2023-32233 kernel: netfilter: use-after-free in nf_tables when processing batch requests can lead to privilege escalation

CVEs

• CVE-2023-0461
• CVE-2023-2008
• CVE-2023-32233

References

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