SB20260812361 - NULL pointer dereference in Linux kernel trace

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2026-68174)

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 an invalid pointer dereference in __ftrace_set_clr_event_nolock() and update_event_fields() when filtering or setting events for a specific module on dynamic events. A local user can write a module-specific event filter such as ':mod:' to trigger a kernel crash and cause a denial of service.

Exploitation requires a dynamic event with a non-zero reference count, such as one with active event triggers or perf attachments.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/43a23dfe0024afd3d2b0232e987d0292919a9b24
• https://git.kernel.org/stable/c/b4eb07bde606c2096b24252be589e735eff6d413
• https://git.kernel.org/stable/c/b6a4575f22925da7e6aa00171e9fc0e5029c0bc9