RHSA-2026:36348 - Security Advisory

Topic

An update for kernel-rt 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

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: tcp: fix potential race in tcp_v6_syn_recv_sock() (CVE-2026-43198)
• kernel: netfilter: nfnetlink_cthelper: fix OOB read in nfnl_cthelper_dump_table() (CVE-2026-43450)
• kernel: sctp: revalidate list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL (CVE-2026-46227)
• kernel: drm/gem: Fix inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs() (CVE-2026-46209)
• kernel: procfs: fix missing RCU protection when reading real_parent in do_task_stat() (CVE-2026-46259)
• kernel: Arm Processors: Privilege escalation or information disclosure via writes to higher exception level resources (CVE-2025-10263)

Bug Fix(es) and Enhancement(s):

• kernel panic at trailing_symlink while the task wdavdaemon runs even after 4c4f7c19b3c7 (JIRA:RHEL-152759)

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

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

Affected Products

• Red Hat Enterprise Linux for Real Time 8 x86_64
• Red Hat Enterprise Linux for Real Time for NFV 8 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 8.10 x86_64

Fixes

• BZ - 2467228 - CVE-2026-43198 kernel: tcp: fix potential race in tcp_v6_syn_recv_sock()
• BZ - 2468228 - CVE-2026-43450 kernel: netfilter: nfnetlink_cthelper: fix OOB read in nfnl_cthelper_dump_table()
• BZ - 2482564 - CVE-2026-46227 kernel: sctp: revalidate list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL
• BZ - 2482636 - CVE-2026-46209 kernel: drm/gem: Fix inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs()
• BZ - 2484477 - CVE-2026-46259 kernel: procfs: fix missing RCU protection when reading real_parent in do_task_stat()
• BZ - 2486958 - CVE-2025-10263 kernel: Arm Processors: Privilege escalation or information disclosure via writes to higher exception level resources

CVEs

• CVE-2025-10263
• CVE-2026-43198
• CVE-2026-43450
• CVE-2026-46209
• CVE-2026-46227
• CVE-2026-46259

References

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