RHSA-2026:55762 - Security Advisory

Topic

An update for multiple packages is now available for Red Hat Enterprise Linux 8.

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

This is a kernel live patch module which can be loaded by the kpatch command line utility to modify the code of a running kernel. This patch module is targeted for kernel-4.18.0-553.53.1.el8_10.

Security Fix(es):

• kernel: ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach() (CVE-2026-43038)
• kernel: dlm: validate length in dlm_search_rsb_tree (CVE-2026-43125)
• kernel: netfilter: flowtable: strictly check for maximum number of actions (CVE-2026-43329)
• kernel: net: sched: UAF via missing handler for TC_ACT_CONSUMED in tcf_qevent_handle (CVE-2026-64530)

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.

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

Affected Products

• Red Hat Enterprise Linux for x86_64 8 x86_64
• Red Hat Enterprise Linux for Power, little endian 8 ppc64le
• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 8.10 x86_64
• Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 8.10 ppc64le

Fixes

• BZ - 2464397 - CVE-2026-43038 kernel: ipv6: icmp: clear skb2->cb[] in ip6_err_gen_icmpv6_unreach()
• BZ - 2467234 - CVE-2026-43125 kernel: dlm: validate length in dlm_search_rsb_tree
• BZ - 2468124 - CVE-2026-43329 kernel: netfilter: flowtable: strictly check for maximum number of actions
• BZ - 2504052 - CVE-2026-64530 kernel: net: sched: UAF via missing handler for TC_ACT_CONSUMED in tcf_qevent_handle

CVEs

• CVE-2026-43038
• CVE-2026-43125
• CVE-2026-43329
• CVE-2026-64530

References

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