CVE-2026-53670: Vbpf Prevail

Critical severity, CVSS 9.3. EPSS: 0.5% chance of exploitation in the next 30 days.

PREVAIL is a Polynomial-Runtime EBPF Verifier using an Abstract Interpretation Layer. Prior to version 0.2.4, in the Prevail eBPF verifier, EbpfTransformer::add() silently skips offset-variable updates when the destination register carries a non-singleton typeset (two or more simultaneously possible pointer types). Subsequent bounds checks use the stale offset and accept out-of-bounds memory accesses, so a crafted BPF program passes verification even though it would corrupt memory at runtime. This issue has been patched in version 0.2.4.

Affected products

• Vbpf Prevail: before 0.2.4 (fixed in 0.2.4)

Published 2026-09-02. Last modified 2026-09-09.