CVE-2026-49427 (High) detected in src4.0.4, src4.0.4

[mend-bolt-for-github]

CVE-2026-49427 - High Severity Vulnerability

Vulnerable Libraries - src4.0.4, src4.0.4

src4.0.4

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

Vulnerable Source Files (2)

/sys/kern/uipc_shm.c
/sys/vm/vm_page.c

src4.0.4

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

Vulnerable Source Files (2)

/sys/kern/uipc_shm.c
/sys/vm/vm_page.c

Found in base branches: stable/4.0, master

Vulnerability Details

Pages belonging to largepage shared memory objects were not explicitly wired. When sendfile(2) transmitted such an object with the SF_NOCACHE flag, it freed the underlying pages after transmission even though existing mappings still referred to them.
An unprivileged local user can abuse the bug to access freed kernel memory. This can be exploited to escalate privileges.

Publish Date: 2026-08-19

URL: CVE-2026-49427

CVSS 3 Score Details (8.8)

Base Score Metrics:

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

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Release Date: 2026-08-19

Fix Resolution: https://github.com/freebsd/freebsd-src.git - release/14.4.0-p7,https://github.com/freebsd/freebsd-src.git - release/15.1.0-p1,https://github.com/freebsd/freebsd-src.git - release/14.3.0-p16,https://github.com/freebsd/freebsd-src.git - release/15.0.0-p11

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