bpf: Check ancestor frames for rbtree callbacks

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Summary

CVECVE-2026-98047
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:33 UTC
Updated2026-09-25 11:17:33 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: Check ancestor frames for rbtree callbacks bpf_rbtree_add() invokes its comparator while the caller holds the root lock. The native insertion code retains raw parent and link pointers across the callback, so the verifier prohibits unlocking, consuming tree nodes, or changing RCU state from that callback. in_rbtree_lock_required_cb() only checks the innermost verifier frame. Static subprogram calls are permitted while holding a spin lock, and such a call pushes a frame without in_callback_fn set. Consequently, all callback restrictions disappear in the nested frame. The subprogram can unlock the tree, remove and drop the node being compared, then relock. Native insertion resumes with the stale parent pointer and links freed memory into the tree. Walk all active frames for the rbtree callback instead. Benign static subprograms remain permitted, while callback restrictions follow execution into nested frames.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected a44b1334aadd82203f661adb9adb41e53ad0e8d1 b545fa447e09e6844868deb2bee228827fe54d15 git Not specified
CNA Linux Linux affected a44b1334aadd82203f661adb9adb41e53ad0e8d1 2410cb2ac0416dd2795a81984c8c73d7250bd8c4 git Not specified
CNA Linux Linux affected a44b1334aadd82203f661adb9adb41e53ad0e8d1 369f4ce734570bdfedaa4b5ca50e2a3f6a892728 git Not specified
CNA Linux Linux affected 6.9 Not specified
CNA Linux Linux unaffected 6.9 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/369f4ce734570bdfedaa4b5ca50e2a3f6a892728 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2410cb2ac0416dd2795a81984c8c73d7250bd8c4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b545fa447e09e6844868deb2bee228827fe54d15 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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