CVE-2026-45252 (Medium) detected in src4.0.4

[mend-bolt-for-github]

CVE-2026-45252 - Medium Severity Vulnerability

Vulnerable Library - src4.0.4

Library home page: https://github.com/MidnightBSD/src.git

Found in base branches: stable/4.0, master

Vulnerable Source Files (1)

/sys/fs/fuse/fuse_ipc.h

Vulnerability Details

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.

Publish Date: 2026-05-21

URL: CVE-2026-45252

CVSS 3 Score Details (5.5)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: High
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: Low
  • Integrity Impact: None
  • Availability Impact: High

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Release Date: 2026-05-21

Fix Resolution: https://github.com/freebsd/freebsd-src.git - release/15.0.0-p10,https://github.com/freebsd/freebsd-src.git - release/14.4.0-p6,https://github.com/freebsd/freebsd-src.git - release/14.3.0-p15

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