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CVE-2026-45251 is a FreeBSD kernel use-after-free vulnerability in file descriptor handling involving procdesc objects and poll(2)/select(2) waiters. A file descriptor may be closed while another thread is blocked in poll(2) or select(2) waiting on that descriptor. For affected descriptor types, the kernel failed to unlink blocked threads from the per-object wait queue before freeing the underlying object. In the procdesc case, procdesc_free() frees a struct procdesc containing embedded selection state without draining poll waiters. If the blocked thread is later awakened, it dereferences memory that has already been freed, creating a kernel use-after-free condition. Reported exploitation details indicate the freed slot can be reclaimed through file descriptor table manipulation, leading to stale queue-removal operations and arbitrary kernel pointer writes.
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A local privilege escalation vulnerability in FreeBSD procdesc handling caused by freeing a procdesc structure without draining poll waiters, enabling stale operations and arbitrary kernel-pointer writes.
A FreeBSD local privilege escalation vulnerability in procdesc_free() caused by freeing a procdesc structure without draining poll waiters, enabling arbitrary kernel-pointer writes.
A use-after-free vulnerability in old file descriptor infrastructure; the discussion says FreeBSD 11 is likely affected and no patch is possible on the EOL branch.
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Cross-references every affected SKU, including bundled OEM variants.
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