CVE-2023-54123 md/raid10: fix memleak for 'conf->bio_split'
A memory leak in the Linux kernel RAID10 driver allows local attackers to exhaust system memory, potentially causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-54123?
CVE-2023-54123 is a memory corruption vulnerability in Linux, published on 24 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
md/raid10: fix memleak for 'conf->bio_split'
In the error path of raid10_run(), 'conf' need be freed, however, 'conf->bio_split' is missed and memory will be leaked.
Since there are 3 places to free 'conf', factor out a helper to fix the problem.
Which versions are affected by CVE-2023-54123?
How do I fix CVE-2023-54123?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2023-54123 being exploited?
There is no known exploitation of CVE-2023-54123 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2023-54123, DEBIAN-CVE-2023-54123, GHSA-fggm-fgvr-h4xg, UBUNTU-CVE-2023-54123.