bpf: Preserve unique-field state across nested structs

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-92515
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:54 UTC
Updated2026-09-17 17:17:54 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: Preserve unique-field state across nested structs btf_find_struct_field() initializes a fresh seen mask for every recursive descent. Unique special fields in different levels of the same aggregate therefore do not see one another. The duplicate fields can reach btf_parse_fields(), where they trigger an invariant WARN_ON_ONCE(). A crafted user BTF can consequently trigger the warning before map creation checks capabilities. Initialize the seen mask once in btf_find_field() and pass the same pointer through struct, datasec, and nested-struct walks. This gives the entire field traversal one shared uniqueness state.

Risk And Classification

EPSS: 0.002000000 probability, percentile 0.101580000 (date 2026-09-18)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 64e8ee814819f21beeeda00d4119221443d77992 cec97102d4147e18568c93946014c4c8ebf86fcf git Not specified
CNA Linux Linux affected 64e8ee814819f21beeeda00d4119221443d77992 28d5f20ed022ade0fb0bfbf50b78fec782083175 git Not specified
CNA Linux Linux affected 64e8ee814819f21beeeda00d4119221443d77992 373a1e9366e711b89bc5e45bd6edf33ef62402cd git Not specified
CNA Linux Linux affected 64e8ee814819f21beeeda00d4119221443d77992 f08619f060468076e4acbdc10e0713af20d60e65 git Not specified
CNA Linux Linux affected 6.11 Not specified
CNA Linux Linux unaffected 6.11 semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/28d5f20ed022ade0fb0bfbf50b78fec782083175 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/373a1e9366e711b89bc5e45bd6edf33ef62402cd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cec97102d4147e18568c93946014c4c8ebf86fcf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f08619f060468076e4acbdc10e0713af20d60e65 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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