by Kastro
Paper/Archive/CVE-2026-53670

CVE-2026-53670

vbpf prevail — PREVAIL: Non-singleton typeset in add() skips offset update, allowing OOB access to pass eBPF verification

EPSS 0.5%public exploitCVSS 9.3
critical.is priorityof 100
47
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 43.3.433 × 208.7Exploit: SSVC poc+1010.0SSVC exploitation: poc+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
prevail< 0.2.4–CNA

Scores by source

GitHub_M (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: poc · Automatable: yes · Technical impact: total

References

exploitgithub.com/vbpf/prevail/security/advisories/GHSA-2qc8-qh94-66rcrefgithub.com/vbpf/prevail/commit/2b209bc4e3d612ff9aca87125e67c0ff84477e61refgithub.com/vbpf/prevail/releases/tag/v0.2.4