RHSA-2026:1661 - 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 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: IB/hfi1: Fix sdma.h tx->num_descs off-by-one error (CVE-2024-26766)
• kernel: RDMA/core: Fix "KASAN: slab-use-after-free Read in ib_register_device" problem (CVE-2025-38022)
• kernel: Linux kernel: RDMA/rxe use-after-free vulnerability leading to potential arbitrary code execution (CVE-2025-38024)
• kernel: Linux kernel: Memory corruption in Squashfs due to incorrect block size calculation (CVE-2025-38415)
• kernel: Linux kernel: Denial of Service in ATM CLIP module via infinite recursion (CVE-2025-38459)
• kernel: Linux kernel: Denial of Service via out-of-bounds read in USB configuration parsing (CVE-2025-39760)
• kernel: mptcp: fix race condition in mptcp_schedule_work() (CVE-2025-40258)
• kernel: Linux kernel: Use-after-free in proc_readdir_de() can lead to privilege escalation or denial of service. (CVE-2025-40271)
• kernel: Linux kernel: Information disclosure and denial of service via out-of-bounds read in font glyph handling (CVE-2025-40322)
• 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.

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

Fixes

• BZ - 2273187 - CVE-2024-26766 kernel: IB/hfi1: Fix sdma.h tx->num_descs off-by-one error
• BZ - 2373326 - CVE-2025-38022 kernel: RDMA/core: Fix "KASAN: slab-use-after-free Read in ib_register_device" problem
• BZ - 2373354 - CVE-2025-38024 kernel: Linux kernel: RDMA/rxe use-after-free vulnerability leading to potential arbitrary code execution
• BZ - 2383404 - CVE-2025-38415 kernel: Linux kernel: Memory corruption in Squashfs due to incorrect block size calculation
• BZ - 2383487 - CVE-2025-38459 kernel: Linux kernel: Denial of Service in ATM CLIP module via infinite recursion
• BZ - 2394601 - CVE-2025-39760 kernel: Linux kernel: Denial of Service via out-of-bounds read in USB configuration parsing
• BZ - 2418876 - CVE-2025-40258 kernel: mptcp: fix race condition in mptcp_schedule_work()
• BZ - 2419837 - CVE-2025-40271 kernel: Linux kernel: Use-after-free in proc_readdir_de() can lead to privilege escalation 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 - 2426226 - CVE-2022-50865 kernel: tcp: fix a signed-integer-overflow bug in tcp_add_backlog()

CVEs

• CVE-2022-50865
• CVE-2024-26766
• CVE-2025-38022
• CVE-2025-38024
• CVE-2025-38415
• CVE-2025-38459
• CVE-2025-39760
• CVE-2025-40258
• CVE-2025-40271
• CVE-2025-40322

References

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