CVE-2026-49428

Certain system calls, such open2 with the OTRUNC flag set, and fspacectl2, 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...

CVE-2026-49428 posixshm: system calls can incorrectly free memory of largepage objects

Certain system calls, such open2 with the OTRUNC flag set, and fspacectl2, 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...

CVE-2026-49427

In FreeBSD's posixshm module, pages backing largepage shared memory objects were not explicitly wired, so sendfile(2) with SF_NOCACHE freed them despite active mappings, enabling use-after-free of kernel memory. An unprivileged local user can exploit this to read freed kernel memory and escalate ...