bpf: Reject resilient lock operations in rbtree callbacks

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98060
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:35 UTC
Updated2026-09-25 11:17:35 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: Reject resilient lock operations in rbtree callbacks __bpf_rbtree_add() keeps parent and link pointers live across calls to the program-supplied comparison callback. The verifier therefore requires the root's lock to remain held throughout the callback. The helper path enforces this rule for bpf_spin_lock() and bpf_spin_unlock(), but the resilient lock kfunc argument path does not. Since resilient locks may protect BPF rbtree roots, a callback can release the root lock and let another CPU remove and free the node referenced by the in-progress tree walk. The walk then resumes using freed pointers. Reject resilient lock kfuncs in an rbtree comparison callback, matching the existing policy for the spin lock helpers. Resilient-lock-protected trees remain valid when their comparison callbacks leave lock state alone.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0de2046137f976e7302d43ac01d9894d07ac1fff cc2e065ed206aecd9b94564779244f3ffb26e356 git Not specified
CNA Linux Linux affected 0de2046137f976e7302d43ac01d9894d07ac1fff 71930202a0a0c49f0a3b45b41907a074cb780266 git Not specified
CNA Linux Linux affected 0de2046137f976e7302d43ac01d9894d07ac1fff 7b7b8b5960102566bd625ae829d1f330c5b5d104 git Not specified
CNA Linux Linux affected 6.15 Not specified
CNA Linux Linux unaffected 6.15 semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/71930202a0a0c49f0a3b45b41907a074cb780266 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cc2e065ed206aecd9b94564779244f3ffb26e356 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7b7b8b5960102566bd625ae829d1f330c5b5d104 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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