CVE-2023-54033: Linux

EPSS: 0.2% chance of exploitation in the next 30 days.

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 products

• Linux Linux: from 5.11, before 5.15.115 (fixed in 5.15.115); from 5.16, before 6.1.31 (fixed in 6.1.31); from 6.2, before 6.3.5 (fixed in 6.3.5)

Published 2025-12-24. Last modified 2026-06-17.