bpf: Reject exclusive maps as inner maps in map-in-map

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Summary

CVECVE-2026-74364
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:38 UTC
Updated2026-08-15 06:22:38 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: Reject exclusive maps as inner maps in map-in-map An exclusive map (created with excl_prog_hash) is bound to a single program by hash: check_map_prog_compatibility() refuses to load any program whose digest does not match map->excl_prog_sha. That check only runs for maps a program references directly, i.e. its used_maps. A map reached at runtime through a map-of-maps is never in used_maps, and bpf_map_meta_equal() does not consider excl_prog_sha, so an exclusive map can be inserted into a non-exclusive outer map and then looked up and mutated by an unrelated program, bypassing the exclusivity guarantee. For the signed loader this defeats the metadata map exclusivity check added in the signed loader: the cached map->sha[] is validated against the signed hash while another program on a hostile host rewrites the frozen map's contents through the outer map.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected baefdbdf6812e120c9fba9cfb101d3656f478026 3a0f73d27a8d379a8852a378b3c3208143e3b3b2 git Not specified
CNA Linux Linux affected baefdbdf6812e120c9fba9cfb101d3656f478026 7c58ace08f180f8e249e714d1623388362f9d807 git Not specified
CNA Linux Linux affected baefdbdf6812e120c9fba9cfb101d3656f478026 9a3c3c49c333760c8944dadacbe114c1884546ef 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-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/7c58ace08f180f8e249e714d1623388362f9d807 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3a0f73d27a8d379a8852a378b3c3208143e3b3b2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9a3c3c49c333760c8944dadacbe114c1884546ef 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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