Riskcovery

CVE-2026-80675

libbpf: Reject non-exclusive metadata maps in the signed loader

State
Published
Severity
7.1 High
Published
Aug 28, 2026
Updated
Aug 29, 2026
Reserved
Aug 26, 2026

Read the record on cve.org

Description

In the Linux kernel, the following vulnerability has been resolved:

libbpf: Reject non-exclusive metadata maps in the signed loader

The loader verifies map->sha against the metadata hash in its instructions. map->sha is calculated when BPF_OBJ_GET_INFO_BY_FD is called on the frozen map.

While the map is frozen, the /signed loader/ must also ensure the map is exclusive, as, without exclusivity (which a hostile host could just omit when loading the loader), another BPF program with map access can mutate the contents afterwards, so the check passes on stale data.

With the extra check as part of the signed loader, it now refuses to move on with map->sha validation if the host set it up wrongly.

Scores

CVSSScoreVectorSource
3.17.1 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:NLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • fb2b0e290147ba01a53dfd92cf91058c9d2ee254 to before b6862b6a25c6a925fb0b0e549ee4a52a8d2966fbAffected
  • fb2b0e290147ba01a53dfd92cf91058c9d2ee254 to before 0dad5adeb34b6f78a883e8faa6a1c947a240e7c9Affected
  • fb2b0e290147ba01a53dfd92cf91058c9d2ee254 to before 0fb6c9ed6493b4af01be8bb0a384574eba7df636Affected
LinuxLinux
  • 6.18Affected
  • before 6.18Not affected
  • 6.18.40 through 6.18.*Not affected
  • 7.1.5 through 7.1.*Not affected
  • 7.2 and laterNot affected

References

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