What is CVE-2023-54056?

CVE-2023-54056 is a unscored severity Linux kernel vulnerability, affecting Linux kernel versions from 5.2 onward and patched in 5.4.243, 5.10.180, 5.15.111 and others. CVE-2023-54056 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2023-54056?

CVE-2023-54056 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2023-54056?

Yes, CVE-2023-54056 has been patched. Fixed versions include 5.4.243, 5.10.180, 5.15.111 and others. If you are running Linux kernel 5.2 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2023-54056 actively exploited?

CVE-2023-54056 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2023-54056

In the Linux kernel, the following vulnerability has been resolved: kheaders: Use array declaration instead of char Under CONFIG_FORTIFY_SOURCE, memcpy() will check the size of destination and source buffers. Defining kernel_headers_data as "char" would trip this check. Since these addresses are treated as byte arrays, define them as arrays (as done everywhere else). This was seen with: $ cat /sys/kernel/kheaders.tar.xz >> /dev/null detected buffer overflow in memcpy kernel BUG at lib/string_helpers.c:1027! ... RIP: 0010:fortify_panic+0xf/0x20 [...] Call Trace: <TASK> ikheaders_read+0x45/0x50 [kheaders] kernfs_fop_read_iter+0x1a4/0x2f0 ...

Package Linux Kernel

Published 2025-12-24

Last modified 2026-04-15

Patch available

Yes

Affected versions

Linux kernel versions 5.2 and later are affected. Fixed in 5.4.243, 5.10.180, 5.15.111, 6.1.28, 6.2.15, 6.3.2, 6.4 and their respective stable series.

Affected from

≥ 5.2

Fixed in

✓ 5.4.243 5.4.x ✓ 5.10.180 5.10.x ✓ 5.15.111 5.15.x ✓ 6.1.28 6.1.x ✓ 6.2.15 6.2.x ✓ 6.3.2 6.3.x ✓ 6.4

References

The following references provide additional information about CVE-2023-54056 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/4a07d2d511e2703efd4387891d49e0326f1157f3
Patch
Kernel patch commit
https://git.kernel.org/stable/c/719459877d58c8aced5845c1e5b98d8d87d09197
Patch
Kernel patch commit
https://git.kernel.org/stable/c/82d2e01b95c439fe55fab5e04fc83387c42d3a48
Patch

7 patch commits total View all on NVD

Frequently asked questions

What is CVE-2023-54056?

CVE-2023-54056 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.2 onward and has been patched in 5.4.243, 5.10.180, 5.15.111 and others. CVE-2023-54056 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2023-54056?

Yes — CVE-2023-54056 has been patched. Fixed versions include 5.4.243, 5.10.180, 5.15.111 and others. If you are running Linux kernel 5.2 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2023-54056 actively exploited?

No — CVE-2023-54056 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.