RHSA-2026:77214 - Security Advisory

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions.

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: linux/dim: Fix divide by 0 in RDMA DIM (CVE-2022-49670)
• kernel: ALSA: 6fire: fix use-after-free on disconnect (CVE-2026-31581)
• kernel: ip6_gre: Use cached t->net in ip6erspan_changelink() (CVE-2026-46120)
• kernel: sctp: purge outqueue on stale COOKIE-ECHO handling (CVE-2026-52924)
• kernel: netfilter: conntrack: remove sprintf usage (CVE-2026-53002)
• kernel: ice: fix double-free of tx_buf skb (CVE-2026-53009)
• kernel: zram: fix use-after-free in zram_bvec_write_partial() (CVE-2026-53185)
• kernel: i2c: stub: Reject I2C block transfers with invalid length (CVE-2026-64191)
• kernel: net: qrtr: restrict socket creation to the initial network namespace (CVE-2026-68294)
• kernel: netfilter: flowtable: publish GC-visible tuple last (CVE-2026-74746)

Bug Fix(es) and Enhancement(s):

• RT scheduler livelock: migrate-disabled task at pushable-list head causes repeated RT push/stopper retries, starving a critical RT task (remaining issue after CVE-2026-45919 fix in 94894c9c477e) (JIRA:RHEL-257978)

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.

Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture.

Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.

Affected Products

• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.2 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.2 x86_64

Fixes

• BZ - 2347919 - CVE-2022-49670 kernel: linux/dim: Fix divide by 0 in RDMA DIM
• BZ - 2461471 - CVE-2026-31581 kernel: ALSA: 6fire: fix use-after-free on disconnect
• BZ - 2482614 - CVE-2026-46120 kernel: ip6_gre: Use cached t->net in ip6erspan_changelink()
• BZ - 2492095 - CVE-2026-52924 kernel: sctp: purge outqueue on stale COOKIE-ECHO handling
• BZ - 2492329 - CVE-2026-53002 kernel: netfilter: conntrack: remove sprintf usage
• BZ - 2492390 - CVE-2026-53009 kernel: ice: fix double-free of tx_buf skb
• BZ - 2492735 - CVE-2026-53185 kernel: zram: fix use-after-free in zram_bvec_write_partial()
• BZ - 2502872 - CVE-2026-64191 kernel: i2c: stub: Reject I2C block transfers with invalid length
• BZ - 2513353 - CVE-2026-68294 kernel: net: qrtr: restrict socket creation to the initial network namespace
• BZ - 2524483 - CVE-2026-74746 kernel: netfilter: flowtable: publish GC-visible tuple last

CVEs

• CVE-2022-49670
• CVE-2026-31581
• CVE-2026-46120
• CVE-2026-52924
• CVE-2026-53002
• CVE-2026-53009
• CVE-2026-53185
• CVE-2026-64191
• CVE-2026-68294
• CVE-2026-74746

References

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