RHSA-2026:0760 - 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: smb: client: Fix use-after-free in cifs_fill_dirent (CVE-2025-38051)
• kernel: smb: client: let recv_done verify data_offset, data_length and remaining_data_length (CVE-2025-39933)
• kernel: drm/i915: mark requests for GuC virtual engines to avoid use-after-free (CVE-2023-53552)
• kernel: drm/sched: Fix potential double free in drm_sched_job_add_resv_dependencies (CVE-2025-40096)
• kernel: net: atlantic: fix fragment overflow handling in RX path (CVE-2025-68301)

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 - 2373329 - CVE-2025-38051 kernel: smb: client: Fix use-after-free in cifs_fill_dirent
• BZ - 2401432 - CVE-2025-39933 kernel: smb: client: let recv_done verify data_offset, data_length and remaining_data_length
• BZ - 2401514 - CVE-2023-53552 kernel: drm/i915: mark requests for GuC virtual engines to avoid use-after-free
• BZ - 2407333 - CVE-2025-40096 kernel: drm/sched: Fix potential double free in drm_sched_job_add_resv_dependencies
• BZ - 2422836 - CVE-2025-68301 kernel: net: atlantic: fix fragment overflow handling in RX path

CVEs

• CVE-2023-53552
• CVE-2025-38051
• CVE-2025-39933
• CVE-2025-40096
• CVE-2025-68301

References

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