SB2026102975 - Use-after-free in Linux kernel ocfs2 dlm

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-99204)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local privileged user to potentially cause a denial of service through invalid kernel memory access.

The vulnerability exists due to use-after-free in the Linux kernel OCFS2 DLM debug_state_print() function when reading recovery participant records without holding the lock that protects their list. A local privileged user can open the DLM debugfs state interface concurrently with recovery-area teardown to trigger reads of freed participant records, potentially causing a kernel crash.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/04d4571c00db61a9664f387752fa05cb3c08a537
• https://git.kernel.org/stable/c/2bc426a32bfb78868c7f76d9547132837b6b5284
• https://git.kernel.org/stable/c/4c435828932bf46f29860e4a0375bcae101b778a