CVE-2023-54033
Description
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.
How to fix
- Linux Linux79ea1a12fb9a8275b6e19d4ca625dd872dedcbb9, 1a9e80f757bbb1562d82e350afce2bb2f712cc3d, 965e9cccbe6b9c7b379908cebcb5e3a47f20dd5e, b34ffb0c6d23583830f9327864b9c1f486003305 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 ≤ v < 79ea1a12fb9a8275b6e19d4ca625dd872dedcbb9, 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 ≤ v < 1a9e80f757bbb1562d82e350afce2bb2f712cc3d, 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 ≤ v < 965e9cccbe6b9c7b379908cebcb5e3a47f20dd5e, 20b6cc34ea74b6a84599c1f8a70f3315b56a1883 ≤ v < b34ffb0c6d23583830f9327864b9c1f486003305, 5.11 | 79ea1a12fb9a8275b6e19d4ca625dd872dedcbb9, 1a9e80f757bbb1562d82e350afce2bb2f712cc3d, 965e9cccbe6b9c7b379908cebcb5e3a47f20dd5e, b34ffb0c6d23583830f9327864b9c1f486003305 |
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