CVE-2026-52929 Linux CVE debrief

Who should care

Linux kernel users and administrators should be aware of this vulnerability and take steps to patch their systems. This vulnerability can be exploited remotely, and its exploitation can result in a denial of service. Users of Linux distributions that include the affected kernel versions should prioritize patching.

Technical summary

The Linux kernel vulnerability CVE-2026-52929 involves a fix for a stream add-out denial issue in the SCTP stream. When ADD_OUT_STREAMS is denied, the kernel only partially rolls back the changes, leaving behind removed stream metadata. This can lead to a null-pointer dereference when the stream is re-added later. The fix involves a complete rollback of the denied add-stream state, ensuring that scheduler-private RR/FC/PRIO lists remain consistent.

Defensive priority

High priority should be given to patching this vulnerability, as it can be exploited remotely and can result in a denial of service. Linux kernel users and administrators should prioritize patching their systems to prevent potential exploitation.

Recommended defensive actions

• Patch the Linux kernel to the latest version that includes the fix for CVE-2026-52929.
• Review and update Linux distribution packages to ensure the patched kernel version is installed.
• Perform a thorough inventory of Linux kernel versions in use and prioritize patching based on risk and exposure.
• Monitor Linux kernel logs for potential exploitation attempts.
• Implement compensating controls, such as network segmentation and access controls, to limit the attack surface.

Evidence notes

The CVE-2026-52929 vulnerability was published on June 24, 2026, and modified on June 28, 2026. The vulnerability has a CVSS score of 7.5 and is classified as HIGH severity. The fix involves a complete rollback of the denied add-stream state, ensuring that scheduler-private RR/FC/PRIO lists remain consistent.

Official resources