Vulnerability · Published Sep 2, 2026 · Assigned by GitHub_M

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

Critical 9.3

In plain English

A critical-severity security flaw in prevail from vbpf. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities).

Severity (CVSS 4.0)9.3Critical

Exploit odds (30 days)0.5%top 56.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
vbpf	prevail	< 0.2.4

Weakness: CWE-682 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References

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