SB20260824187 - NULL pointer dereference in Linux kernel trace

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2026-74633)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a null pointer dereference in remove_cache_mod() in the tracing subsystem when handling crafted writes to /sys/kernel/tracing/set_event. A local user can send specially crafted event filter strings to cause a denial of service.

The issue is triggered when a module-only event filter is cached for a module that has not been loaded, and a later concatenated write attempts to remove a specific match from the same module.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/152a00440dc6ef62c6e4cf9bd881a7e6bb81fda9
• https://git.kernel.org/stable/c/ad4e9dd5fec7a322a471ff36fb9c76214e3c6992
• https://git.kernel.org/stable/c/b69859204d4db3acd86c1c2dadcef0d77b451933