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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80675
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 08:16:52 UTC
Updated2026-08-29 07:16:49 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.001660000 probability, percentile 0.060720000 (date 2026-08-28)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected fb2b0e290147ba01a53dfd92cf91058c9d2ee254 b6862b6a25c6a925fb0b0e549ee4a52a8d2966fb git Not specified
CNA Linux Linux affected fb2b0e290147ba01a53dfd92cf91058c9d2ee254 0dad5adeb34b6f78a883e8faa6a1c947a240e7c9 git Not specified
CNA Linux Linux affected fb2b0e290147ba01a53dfd92cf91058c9d2ee254 0fb6c9ed6493b4af01be8bb0a384574eba7df636 git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0dad5adeb34b6f78a883e8faa6a1c947a240e7c9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0fb6c9ed6493b4af01be8bb0a384574eba7df636 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b6862b6a25c6a925fb0b0e549ee4a52a8d2966fb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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