SB20260918371 - Use-after-free in Linux kernel ocfs2 cluster

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-90301)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 2.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

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

The vulnerability exists due to use-after-free in the OCFS2 o2hb heartbeat region handlers and delayed timeout work when processing heartbeat negotiation messages while a heartbeat region is being initialized or torn down. A remote user can send a heartbeat negotiation message to cause a denial of service.

Exploitation requires racing heartbeat region lifecycle operations with an in-flight o2net callback or delayed work.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/011291b70ba4832e136b7b581825b2bc0f525bf6
• https://git.kernel.org/stable/c/b5a2907bdeced0949bcddc84b95ba7d4cb93841b