Heap-based buffer overflow in FreeBSD - CVE-2026-45252
Published: May 21, 2026
Vulnerability identifier: #VU132008
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-45252
CWE-ID: CWE-122
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: FreeBSD Foundation
Affected software:
FreeBSD
FreeBSD
Detailed vulnerability description
The vulnerability allows a local user to disclose sensitive information or corrupt kernel heap memory.
The vulnerability exists due to a heap-based buffer overflow in the fusefs kernel module FUSE_LISTXATTR handling when processing a daemon-supplied extended attribute list. A local user can send a non-NUL-terminated list of extended attributes to disclose sensitive information or corrupt kernel heap memory.
Exploitation requires control of a fusefs userspace daemon, and unprivileged use depends on the vfs.usermount sysctl being enabled.
How to mitigate CVE-2026-45252
Install security update from vendor's website.