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Medium severity5.5NVD Advisory· Published May 21, 2026· Updated May 21, 2026

CVE-2026-45252

CVE-2026-45252

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.

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Affected products

30
  • FreeBSD/FreeBSD29 versions
    cpe:2.3:o:freebsd:freebsd:14.3:-:*:*:*:*:*:*+ 28 more
    • cpe:2.3:o:freebsd:freebsd:14.3:-:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p1:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p10:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p11:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p12:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p13:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p2:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p3:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p4:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p5:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p6:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p7:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p8:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.3:p9:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.4:-:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.4:p1:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.4:p2:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.4:p3:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.4:p4:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:14.4:rc1:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:-:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p1:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p2:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p3:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p4:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p5:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p6:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p7:*:*:*:*:*:*
    • cpe:2.3:o:freebsd:freebsd:15.0:p8:*:*:*:*:*:*
  • FreeBSD/fusefsllm-fuzzy

Patches

Vulnerability mechanics

References

1

News mentions

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