CVE-2026-43125 dlm: validate length in dlm_search_rsb_tree
An attacker can trigger an out-of-bounds write in the Linux kernel Distributed Lock Manager via crafted network messages, potentially leading to code execution or system crash.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-43125?
CVE-2026-43125 is a critical memory corruption vulnerability in Linux kernel, published on 6 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
dlm: validate length in dlm_search_rsb_tree
The len parameter in dlm_dump_rsb_name() is not validated and comes from network messages. When it exceeds DLM_RESNAME_MAXLEN, it can cause out-of-bounds write in dlm_search_rsb_tree().
Add length validation to prevent potential buffer overflow.
Which versions are affected by CVE-2026-43125?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43125?
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-2026-43125 being exploited?
There is no known exploitation of CVE-2026-43125 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-85779, BELL-CVE-2026-43125, DEBIAN-CVE-2026-43125, GHSA-fr2c-799q-pg3x, ROOT-OS-DEBIAN-11-CVE-2026-43125, ROOT-OS-DEBIAN-12-CVE-2026-43125 and 3 more.