CVE-2026-92520 — bpf: Zero queue and stack outputs on lock failure

Affected: Linux

In the Linux kernel, the following vulnerability has been resolved:

bpf: Zero queue and stack outputs on lock failure

Queue and stack pop/peek helpers accept an uninitialized output buffer because the verifier expects the helper to initialize it. The empty-map error path clears the buffer, but a failed lock acquisition returns -EBUSY without writing it.

Clear the output before returning -EBUSY so BPF programs cannot observe uninitialized stack contents after a failed helper call.

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CVE-2026-92520 — bpf: Zero queue and stack outputs on lock failure