RHSA-2026:98638 - Security Advisory

Topic

An update for kernel is now available for Red Hat Enterprise Linux 10.

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 packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: sctp: stream: fully roll back denied add-stream state (CVE-2026-52929)
• kernel: net/mlx5: Fix MCIA register buffer overflow on 32 dword reads (CVE-2026-68293)
• kernel: sunrpc: pin svc_xprt across the asynchronous TLS handshake callback (CVE-2026-72222)
• kernel: sunrpc: wait for in-flight TLS handshake callback when cancel loses race (CVE-2026-72221)
• kernel: smb: client: clear setuid/setgid bit on write with cifsacl/modefromsid/posix extensions (CVE-2026-89638)
• kernel: openvswitch: Fix CT limit teardown use-after-free (CVE-2026-89488)
• kernel: PCI/sysfs: Add lockdown checks to legacy I/O and memory handlers (CVE-2026-90315)

Bug Fix(es) and Enhancement(s):

• [RHEL10.3z] watchdog: System can panic during reboot when pretimeout is disabled (0) (JIRA:RHEL-255346)

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 10 x86_64
• Red Hat Enterprise Linux for IBM z Systems 10 s390x
• Red Hat Enterprise Linux for Power, little endian 10 ppc64le
• Red Hat Enterprise Linux for ARM 64 10 aarch64
• Red Hat CodeReady Linux Builder for x86_64 10 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian 10 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 10 aarch64
• Red Hat CodeReady Linux Builder for IBM z Systems 10 s390x

Fixes

• BZ - 2492108 - CVE-2026-52929 kernel: sctp: stream: fully roll back denied add-stream state
• BZ - 2513150 - CVE-2026-68293 kernel: net/mlx5: Fix MCIA register buffer overflow on 32 dword reads
• BZ - 2516278 - CVE-2026-72222 kernel: sunrpc: pin svc_xprt across the asynchronous TLS handshake callback
• BZ - 2516412 - CVE-2026-72221 kernel: sunrpc: wait for in-flight TLS handshake callback when cancel loses race
• BZ - 2532122 - CVE-2026-89638 kernel: smb: client: clear setuid/setgid bit on write with cifsacl/modefromsid/posix extensions
• BZ - 2532407 - CVE-2026-89488 kernel: openvswitch: Fix CT limit teardown use-after-free
• BZ - 2536264 - CVE-2026-90315 kernel: PCI/sysfs: Add lockdown checks to legacy I/O and memory handlers

CVEs

• CVE-2026-52929
• CVE-2026-68293
• CVE-2026-72221
• CVE-2026-72222
• CVE-2026-89488
• CVE-2026-89638
• CVE-2026-90315

References

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