RHSA-2026:2583 - 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 Moderate. 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: RDMA/core: Fix "KASAN: slab-use-after-free Read in ib_register_device" problem (CVE-2025-38022)
• kernel: smb: client: Fix use-after-free in cifs_fill_dirent (CVE-2025-38051)
• kernel: Bluetooth: hci_event: call disconnect callback before deleting conn (CVE-2023-53673)
• kernel: drm/sched: Fix potential double free in drm_sched_job_add_resv_dependencies (CVE-2025-40096)
• kernel: mptcp: fix race condition in mptcp_schedule_work() (CVE-2025-40258)
• kernel: devlink: rate: Unset parent pointer in devl_rate_nodes_destroy (CVE-2025-40251)
• kernel: Linux kernel: Out-of-bounds write in fbdev can lead to privilege escalation, information disclosure, or denial of service. (CVE-2025-40304)
• kernel: Linux kernel: Information disclosure and denial of service via out-of-bounds read in font glyph handling (CVE-2025-40322)
• kernel: drm/i915: Fix NULL ptr deref by checking new_crtc_state (CVE-2023-53833)

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 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 - 2373326 - CVE-2025-38022 kernel: RDMA/core: Fix "KASAN: slab-use-after-free Read in ib_register_device" problem
• BZ - 2373329 - CVE-2025-38051 kernel: smb: client: Fix use-after-free in cifs_fill_dirent
• BZ - 2402193 - CVE-2023-53673 kernel: Bluetooth: hci_event: call disconnect callback before deleting conn
• BZ - 2407333 - CVE-2025-40096 kernel: drm/sched: Fix potential double free in drm_sched_job_add_resv_dependencies
• BZ - 2418876 - CVE-2025-40258 kernel: mptcp: fix race condition in mptcp_schedule_work()
• BZ - 2418892 - CVE-2025-40251 kernel: devlink: rate: Unset parent pointer in devl_rate_nodes_destroy
• BZ - 2419870 - CVE-2025-40304 kernel: Linux kernel: Out-of-bounds write in fbdev can lead to privilege escalation, information disclosure, or denial of service.
• BZ - 2419902 - CVE-2025-40322 kernel: Linux kernel: Information disclosure and denial of service via out-of-bounds read in font glyph handling
• BZ - 2420366 - CVE-2023-53833 kernel: drm/i915: Fix NULL ptr deref by checking new_crtc_state

CVEs

• CVE-2023-53673
• CVE-2023-53833
• CVE-2025-38022
• CVE-2025-38051
• CVE-2025-40096
• CVE-2025-40251
• CVE-2025-40258
• CVE-2025-40304
• CVE-2025-40322

References

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