Description (CNA)
In 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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 0de2046137f976e7302d43ac01d9894d07ac1fff before cc2e065ed206aecd9b94564779244f3ffb26e356; affected 0de2046137f976e7302d43ac01d9894d07ac1fff before 71930202a0a0c49f0a3b45b41907a074cb780266; affected 0de2046137f976e7302d43ac01d9894d07ac1fff before 7b7b8b5960102566bd625ae829d1f330c5b5d104 |
| Linux / Linux | affected 6.15; unaffected 0 before 6.15; unaffected 6.18.53 through 6.18.*; unaffected 7.2.7 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.