Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: bpf: fix a memory leak in the LRU and LRU_PERCPU hash maps The LRU and LRU_PERCPU maps allocate a new element on update before locking the target hash table bucket. Right after that the maps try to lock the bucket. If this fails, then maps return -EBUSY to the caller without releasing the allocated element. This makes the element untracked: it doesn't belong to either of free lists, and it doesn't belong to the hash table, so can't be re-used; this eventually leads to the permanent -ENOMEM on LRU map updates, which is unexpected. Fix this by returning the element to the local free list if bucket locking fails.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 before 79ea1a12fb9a8275b6e19d4ca625dd872dedcbb9; affected 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 before 1a9e80f757bbb1562d82e350afce2bb2f712cc3d; affected 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 before 965e9cccbe6b9c7b379908cebcb5e3a47f20dd5e; affected 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 before b34ffb0c6d23583830f9327864b9c1f486003305 |
| Linux / Linux | affected 5.11; unaffected 0 before 5.11; unaffected 5.15.115 through 5.15.*; unaffected 6.1.31 through 6.1.*; unaffected 6.3.5 through 6.3.*; unaffected 6.4 through * |
CWE
No CWE identifiers supplied.