Signed BPF integrity bypass via mutable metadata map
Published Aug 28, 2026 · Updated Aug 28, 2026
Integrity verification bypass in Linux 6.18 allows privileged local users to load signed BPF metadata that can change after validation. The libbpf signed loader validates map->sha from a frozen metadata map but fails to require exclusive ownership, so another BPF program can mutate the map after the stale hash passes. Exploitation requires a hostile host with BPF-loading privileges and undermines the signed loader's guarantee that validated metadata remains unchanged.
Summary
What happened
Integrity verification bypass in Linux 6.18 allows privileged local users to load signed BPF metadata that can change after validation. The libbpf signed loader validates map->sha from a frozen metadata map but fails to require exclusive ownership, so another BPF program can mutate the map after the stale hash passes. Exploitation requires a hostile host with BPF-loading privileges and undermines the signed loader's guarantee that validated metadata remains unchanged.
The record
- CVE
- CVE-2026-80675
- Published
- Aug 28, 2026
- Updated
- Aug 28, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1553
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Aug 28, 2026CVE publishedPublication date reported by the CVE source.
- Aug 28, 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=6.18
- Affected versionversion=fb2b0e290147ba01a53dfd92cf91058c9d2ee254 <0dad5adeb34b6f78a883e8faa6a1c947a240e7c9
- Affected versionversion=fb2b0e290147ba01a53dfd92cf91058c9d2ee254 <0fb6c9ed6493b4af01be8bb0a384574eba7df636
- Affected versionversion=fb2b0e290147ba01a53dfd92cf91058c9d2ee254 <b6862b6a25c6a925fb0b0e549ee4a52a8d2966fb
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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