CVE-2026-53671
Severity not reportedPREVAIL is a Polynomial-Runtime EBPF Verifier using an Abstract Interpretation Layer.
PREVAIL is a Polynomial-Runtime EBPF Verifier using an Abstract Interpretation Layer. Prior to version 0.2.4, the abstract transformer in prevail treats writes through a T_CTX-typed base register as a silent no-op: do_mem_store in src/crab/ebpf_transformer.cpp only models T_STACK stores, and the checker's T_CTX bounds arm never tests AccessType::write. An attacker can craft an eBPF program that overwrites a context field (e.g., ctx->data), reload that field typed as T_PACKET, and dereference an attacker-controlled address — and prevail will report the program as safe. This issue has been patched in version 0.2.4.
Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/vbpf/prevail/commit/de65234f67d2608b54d12571edb585ead224363c security-advisories@github.com
- https://github.com/vbpf/prevail/releases/tag/v0.2.4 security-advisories@github.com
- https://github.com/vbpf/prevail/security/advisories/GHSA-65rv-h458-cq99 security-advisories@github.com
- https://github.com/vbpf/prevail/security/advisories/GHSA-65rv-h458-cq99 134c704f-9b21-4f2e-91b3-4a467353bcc0