CVE Watch5 sept 2026

CVE-2026-53671

PREVAIL is a Polynomial-Runtime EBPF Verifier using an Abstract Interpretation Layer. Prior to version 0.2.4, the abstract transformer in pr

CVSS

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Sin CVSS

EPSS

0.3%

p21

KEV

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Exploit Today

0-100

Publicado: 2 sept 2026 · Última mod.: 5 sept 2026 · CWE-682

EPSS · 30d

0.3%EPSS · 30 días0.3%

2026-09-032026-09-06

Descripción técnica

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.

Referencias oficiales

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