Unsafe eBPF acceptance via stale pointer offset
Published Sep 2, 2026 · Updated Sep 2, 2026
Incorrect calculation in vbpf PREVAIL before 0.2.4 allows remote attackers to pass unsafe eBPF programs through verification. EbpfTransformer::add() skips offset-variable updates when a destination register has multiple possible pointer types, so later bounds checks rely on a stale offset. Submission access to a PREVAIL-backed verifier is required; a trusted Linux kernel can then load out-of-bounds reads or writes that enable memory corruption, information disclosure, or privilege escalation.
Summary
What happened
Incorrect calculation in vbpf PREVAIL before 0.2.4 allows remote attackers to pass unsafe eBPF programs through verification. EbpfTransformer::add() skips offset-variable updates when a destination register has multiple possible pointer types, so later bounds checks rely on a stale offset. Submission access to a PREVAIL-backed verifier is required; a trusted Linux kernel can then load out-of-bounds reads or writes that enable memory corruption, information disclosure, or privilege escalation.
The record
- CVE
- CVE-2026-53670
- Published
- Sep 2, 2026
- Updated
- Sep 2, 2026
- Vendor
- vbpf
- Product
- PREVAIL
- Classifications
- CWE-682, T1068
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 2, 2026CVE publishedPublication date reported by the CVE source.
- Sep 2, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 0.2.4
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- GHSA-2qc8-qh94-66rc proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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