CVE-2026-45252: Freebsd

Medium severity, CVSS 5.5. EPSS: 0.4% chance of exploitation in the next 30 days.

When a fusefs file system implements extended attributes, the kernel may send a FUSE_LISTXATTR message to the userspace daemon to retrieve the list of extended attributes for a given file. The FUSE protocol requires the daemon to return a packed list of NUL-terminated strings. The fusefs kernel module calls strlen() on this daemon-supplied buffer without first verifying that the entire list is NUL-terminated. If a malicious daemon sends a non-NUL-terminated list, the fusefs kernel module may read beyond the end of one heap-allocated buffer and potentially write beyond the end of a second buffer. A malicious daemon could disclose up to 253 bytes of kernel heap memory, or it could inject up to 250 attacker-controlled bytes into unallocated kernel heap space.

Affected products

• Freebsd Freebsd: version 14.3 only; version 14.4 only; version 15.0 only

Published 2026-05-21. Last modified 2026-07-23.