RHSA-2026:63013 — Security Advisory

Red Hat Security Advisory: kernel-rt security, bug fix, and enhancement update

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Severity

Important

Red Hat Product Security

RHEL 8

Products

Official CSAF product identity

Published · September 3, 2026

Updated · November 4, 2026

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: s390/cpum_sf: Handle CPU hotplug remove during sampling (CVE-2024-57849)
kernel: smc91x: fix broken irq-context in PREEMPT_RT (CVE-2025-71132)
kernel: bonding: alb: fix UAF in rlb_arp_recv during bond up/down (CVE-2026-45970)
kernel: zram: fix use-after-free in zram_bvec_write_partial() (CVE-2026-53185)
kernel: pNFS: Fix use-after-free in pnfs_update_layout() (CVE-2026-63800)
kernel: nfsd: fix posix_acl leak on SETACL decode failure (CVE-2026-53397)
kernel: nfsd: release layout stid on setlease failure (CVE-2026-53399)
kernel: NFSv4/flexfiles: reject zero filehandle version count (CVE-2026-53392)
kernel: NFSv4/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr (CVE-2026-53391)
kernel: net: mana: validate rx_req_idx to prevent out-of-bounds array access (CVE-2026-64018)
kernel: Kernel: Remote out-of-bounds write in RDMA/siw (CVE-2026-64268)
kernel: NFSv4: include MAY_WRITE in open permission mask for O_TRUNC (CVE-2026-64298)
kernel: AMD-SN-7061: Safe RET Interrupt Vulnerability (CVE-2026-68480)
kernel: net: ipv6: use-after-free in fib6_rule_suppress due to stale res->rt6 pointer (CVE-2026-74581)

Bug Fix(es) and Enhancement(s):

qede: build_skb failure causes off-by-one BD ring corruption and kernel panic [rhel-8.10.z] (JIRA:RHEL-193045)
powerpc/pseries: lparcfg - fix kbuf[] underflow (JIRA:RHEL-240144)

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.