What’s Vulnerable › Vulnerabilities

CVE-2026-53670: PREVAIL: Non-singleton typeset in add() skips offset update, allowing OOB access to pass eBPF verification

• Severity: critical (CVSS 9.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-02 · updated 2026-09-09
• Weakness: CWE-682

Description

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

References

• https://github.com/vbpf/prevail/commit/2b209bc4e3d612ff9aca87125e67c0ff84477e61
• https://github.com/vbpf/prevail/releases/tag/v0.2.4
• https://github.com/vbpf/prevail/security/advisories/GHSA-2qc8-qh94-66rc
• https://github.com/vbpf/prevail/security/advisories/GHSA-2qc8-qh94-66rc

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