What is CVE-2023-54033?

CVE-2023-54033 is a unscored severity Linux kernel vulnerability, affecting Linux kernel versions from 5.11 onward and patched in 5.15.115, 6.1.31, 6.3.5 and others. CVE-2023-54033 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2023-54033?

CVE-2023-54033 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2023-54033?

Yes, CVE-2023-54033 has been patched. Fixed versions include 5.15.115, 6.1.31, 6.3.5 and others. If you are running Linux kernel 5.11 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2023-54033 actively exploited?

CVE-2023-54033 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2023-54033

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.

Package Linux Kernel

Published 2025-12-24

Last modified 2026-04-15

Patch available

Yes

Affected versions

Linux kernel versions 5.11 and later are affected. Fixed in 5.15.115, 6.1.31, 6.3.5, 6.4 and their respective stable series.

Affected from

≥ 5.11

Fixed in

✓ 5.15.115 5.15.x ✓ 6.1.31 6.1.x ✓ 6.3.5 6.3.x ✓ 6.4

References

The following references provide additional information about CVE-2023-54033 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/1a9e80f757bbb1562d82e350afce2bb2f712cc3d
Patch
Kernel patch commit
https://git.kernel.org/stable/c/79ea1a12fb9a8275b6e19d4ca625dd872dedcbb9
Patch
Kernel patch commit
https://git.kernel.org/stable/c/965e9cccbe6b9c7b379908cebcb5e3a47f20dd5e
Patch

4 patch commits total View all on NVD

Frequently asked questions

What is CVE-2023-54033?

CVE-2023-54033 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.11 onward and has been patched in 5.15.115, 6.1.31, 6.3.5 and others. CVE-2023-54033 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2023-54033?

Yes — CVE-2023-54033 has been patched. Fixed versions include 5.15.115, 6.1.31, 6.3.5 and others. If you are running Linux kernel 5.11 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2023-54033 actively exploited?

No — CVE-2023-54033 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.