RHSA-2026:2577 — Security Advisory

An update for kernel-rt is now available for Red Hat Enterprise Linux 9.0 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.

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 kernel: ath9k_htc out-of-bounds access vulnerability (CVE-2022-49503)

• kernel: Linux kernel: Out-of-bounds write in VXLAN due to incorrect nexthop hash size leading to denial of service (CVE-2023-53192)

• kernel: Bluetooth: hci_event: call disconnect callback before deleting conn (CVE-2023-53673)

• kernel: devlink: rate: Unset parent pointer in devl_rate_nodes_destroy (CVE-2025-40251)

• kernel: Linux kernel Bluetooth L2CAP: Kernel crash due to use-after-free via race condition (CVE-2023-53751)

• 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: ext4: fix use-after-free in ext4_orphan_cleanup (CVE-2022-50673)

• kernel: drm/i915: Fix NULL ptr deref by checking new_crtc_state (CVE-2023-53833)

• kernel: net: atlantic: fix fragment overflow handling in RX path (CVE-2025-68301)

• kernel: tcp: fix a signed-integer-overflow bug in tcp_add_backlog() (CVE-2022-50865)

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.