RHSA-2026:9835 — Security Advisory
Red Hat Security Advisory: kernel-rt security update
Severity
ModerateRed Hat Product Security
Products
Official CSAF product identity
Published · April 23, 2026
Updated · September 11, 2026
Topic
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.
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: macvlan: fix possible UAF in macvlan_forward_source() (CVE-2026-23001)
-
kernel: net/sched: cls_u32: use skb_header_pointer_careful() (CVE-2026-23204)
-
kernel: kernel: Privilege escalation or denial of service via use-after-free in nf_tables_addchain() (CVE-2026-23231)
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.