CVE-2026-64359

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the nilfs2 file system where user-supplied segment numbers are not validated before the nilfs clean segments() function begins processing. The range check is performed deep in the call chain by nilfs sufile updatev(), which generates a warning for each invalid entry while holding the ns segctor sem lock and the sufile mi sem. Under heavy load, the latency caused by repeated printk operations can keep the ns segctor sem lock held long enough to trigger a hung task watchdog, blocking concurrent operations such as chmod() that require the lock for read access. This occurs when calling the NILFS IOCTL CLEAN SEGMENTS ioctl endpoint.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.