Answer in brief
CVE-2026-98047 records a Unknown severity vulnerability in bpf: Check ancestor frames for rbtree callbacks. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=a44b1334aadd82203f661adb9adb41e53ad0e8d1 <b545fa447e09e6844868deb2bee228827fe54d15 || >=a44b1334aadd82203f661adb9adb41e53ad0e8d1 <2410cb2ac0416dd2795a81984c8c73d7250bd8c4 || >=a44b1334aadd82203f661adb9adb41e53ad0e8d1 <369f4ce734570bdfedaa4b5ca50e2a3f6a892728 | b545fa447e09e6844868deb2bee228827fe54d15, 2410cb2ac0416dd2795a81984c8c73d7250bd8c4, 369f4ce734570bdfedaa4b5ca50e2a3f6a892728 |
| Linux/Linuxgeneric | 6.9 | Not reported |
Published upstream
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 25, 2026
In 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.
Quoted source text, attributed separately from HOL analysis.