CVE-2026-49428
posixshm: system calls can incorrectly free memory of largepage objects
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
Certain system calls, such open(2) with the O_TRUNC flag set, and fspacectl(2), could incorrectly free memory in largepage objects. These operations are not permitted on largepage objects, but the implementation did not verify this. An unprivileged local user can abuse the bug to access freed kernel memory. This can be exploited to escalate privileges.
| CWE | CWE-915 |
| Vendor | freebsd |
| Product | freebsd |
| Published | Aug 19, 2026 |
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Affected Versions
FreeBSD / FreeBSD
15.1-RELEASE < p1 15.0-RELEASE < p11 14.4-RELEASE < p7 14.3-RELEASE < p16
References
Credits
Chris Jarrett-Davies of the OpenAI Codex Security Team