RHSA-2026:19875 - 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 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: proc: fix UAF in proc_get_inode() (CVE-2025-21999)
• kernel: Linux kernel (qla2xxx): Double free vulnerability leads to denial of service and potential privilege escalation. (CVE-2025-71238)
• kernel: Linux kernel: Denial of service and memory corruption in RDMA umad (CVE-2026-23243)
• kernel: Linux kernel KVM: Privilege escalation or denial of service due to improper shadow page table entry handling (CVE-2026-23401)
• kernel: can: raw: fix ro->uniq use-after-free in raw_rcv() (CVE-2026-31532)
• kernel: "Fragnesia" is a variant of Dirty Frag vulnerability in the ESP/XFRM leading to Local Privilege Escalation (LPE) vulnerability in the Linux kernel (CVE-2026-46300)
• kernel: Read root-owned files as an unprivileged user (CVE-2026-46333)

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 - 2357134 - CVE-2025-21999 kernel: proc: fix UAF in proc_get_inode()
• BZ - 2444398 - CVE-2025-71238 kernel: Linux kernel (qla2xxx): Double free vulnerability leads to denial of service and potential privilege escalation.
• BZ - 2448594 - CVE-2026-23243 kernel: Linux kernel: Denial of service and memory corruption in RDMA umad
• BZ - 2453803 - CVE-2026-23401 kernel: Linux kernel KVM: Privilege escalation or denial of service due to improper shadow page table entry handling
• BZ - 2461107 - CVE-2026-31532 kernel: can: raw: fix ro->uniq use-after-free in raw_rcv()
• BZ - 2477015 - CVE-2026-46300 kernel: "Fragnesia" is a variant of Dirty Frag vulnerability in the ESP/XFRM leading to Local Privilege Escalation (LPE) vulnerability in the Linux kernel
• BZ - 2477802 - CVE-2026-46333 kernel: Read root-owned files as an unprivileged user

CVEs

• CVE-2025-21999
• CVE-2025-71238
• CVE-2026-23243
• CVE-2026-23401
• CVE-2026-31532
• CVE-2026-46300
• CVE-2026-46333

References

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