High severity8.4NVD Advisory· Published Aug 19, 2026· Updated Sep 1, 2026
CVE-2026-49428
CVE-2026-49428
Description
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.
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Affected products
1Patches
Vulnerability mechanics
References
1- security.freebsd.org/advisories/FreeBSD-SA-26:44.posixshm.ascnvdVendor Advisory
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