CVE WatchJul 23, 2026

CVE-2026-45252

When a fusefs file system implements extended attributes, the kernel may send a FUSE_LISTXATTR message to the userspace daemon to retrieve t

CVSS

5.5

Medium

EPSS

0.3%

p21

KEV

—

Exploit Today

0-100

Published: May 21, 2026 · Last modified: Jul 23, 2026 · CWE-122

EPSS · 30d

0.3%EPSS · 30 days0.3%

2026-08-092026-09-05

Technical description

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.

Official references

security.freebsd.orghttps://security.freebsd.org/advisories/FreeBSD-SA-26:20.fusefs.asc

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