#VU120553 Integer underflow in Linux kernel - CVE-2023-54021
Published: December 26, 2025 / Updated: December 31, 2025
Vulnerability identifier: #VU120553
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2023-54021
CWE-ID: CWE-191
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
The vulnerability allows a local user to execute arbitrary code.
The vulnerability exists due to integer underflow within the ext4_mb_normalize_request() function in fs/ext4/mballoc.c. A local user can execute arbitrary code.
Remediation
Install update from vendor's repository.
External links
- https://git.kernel.org/stable/c/2479bb6cbdb4d56b807bbe5229e3e26a6f1f4530
- https://git.kernel.org/stable/c/390eee955d4de4662db5e3e9e9a9eae020432cb7
- https://git.kernel.org/stable/c/3ca3005b502ca8ea87d6a344323b179b48c4e4a3
- https://git.kernel.org/stable/c/abb330ffaa3a0ae7ce632e28c9260b461c01f19f
- https://git.kernel.org/stable/c/b07ffe6927c75d99af534d685282ea188d9f71a6
- https://git.kernel.org/stable/c/bc4a3e1d07a86ae5845321d371190244acacb2f2
- https://git.kernel.org/stable/c/c6bee8970075b256fc1b07bf4873049219380818
- https://git.kernel.org/stable/c/cee78217a7ae72d11c2e21e1a5263b8044489823
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.244