CVE-2026-89493

A flaw was found in the Linux kernel's ocfs2 component. A local attacker with CAP_SYS_ADMIN privileges could exploit this by mounting a crafted or corrupted ocfs2 image, or by performing a raw write to the block device backing an already-mounted ocfs2 filesystem. This vulnerability arises from insufficient validation of rl_used against rl_count in the refcount block validator, allowing an out-of-bounds read and write operation. Successful exploitation could lead to memory corruption and system instability.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.