# CVE-2026-53671

## Summary

- **CVE ID:** CVE-2026-53671
- **Severity:** CRITICAL
- **CVSS Score:** 9.3 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-682
- **Published:** Sep 2, 2026
- **Last Modified:** Sep 5, 2026

## Description

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

- vbpf — prevail (< 0.2.4)

## References

- [CNA](https://github.com/vbpf/prevail/security/advisories/GHSA-65rv-h458-cq99)
- [CNA](https://github.com/vbpf/prevail/commit/de65234f67d2608b54d12571edb585ead224363c)
- [CNA](https://github.com/vbpf/prevail/releases/tag/v0.2.4)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.29%
- **EPSS Percentile:** 21.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._