bpf: Clear rb node linkage when freeing bpf_rb_root

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74344
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:35 UTC
Updated2026-08-15 06:22:35 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: Clear rb node linkage when freeing bpf_rb_root bpf_rb_root_free() detaches the root by copying the current rb_root_cached and then replacing the live root with RB_ROOT_CACHED. It then walks the copied root and drops each object contained in the tree. This leaves the rb node state intact while dropping the object. If the object is refcounted and survives the drop, its bpf_rb_node_kern still contains an owner pointer to the freed root and stale rb tree linkage. If a later bpf_rb_root allocation reuses the same address, bpf_rbtree_remove() can incorrectly pass the owner check and call rb_erase_cached() on a node whose rb pointers belong to the old tree. Mirror the list draining behavior by marking nodes as busy while the root is being detached, then clear the rb node and release the owner before dropping the containing object. This makes surviving nodes unowned and safe to reject from remove or accept for a later add.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 9c395c1b99bd23f74bc628fa000480c49593d17f 2eb39de4962f842d653e96818ae372665cd481fd git Not specified
CNA Linux Linux affected 9c395c1b99bd23f74bc628fa000480c49593d17f 574612793bed416f6c05fe7c9b50e9eb0441997e git Not specified
CNA Linux Linux affected 9c395c1b99bd23f74bc628fa000480c49593d17f 4a7910ee060d8ce55612f5b3cc267f3a265a3cec git Not specified
CNA Linux Linux affected 1d0675957d35ac5e514073481beda62e4e1e2ec5 git Not specified
CNA Linux Linux affected 6.2.15 6.3 semver Not specified
CNA Linux Linux affected 6.3 Not specified
CNA Linux Linux unaffected 6.3 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/2eb39de4962f842d653e96818ae372665cd481fd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4a7910ee060d8ce55612f5b3cc267f3a265a3cec 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/574612793bed416f6c05fe7c9b50e9eb0441997e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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