CVE-2026-92520
UnknownSummary
In the Linux kernel, the BPF queue and stack pop/peek helpers did not zero the output buffer on a failed lock acquisition. BPF programs could observe uninitialized stack contents. The fix clears the buffer before returning -EBUSY.
Risk Assessment
Risk of leaking uninitialized kernel stack data to BPF programs, potentially exposing sensitive information.
Recommendation
Apply a kernel update containing this fix to ensure output buffers are zeroed in BPF helpers.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS