CVE-2026-89575 dm raid1: reserve space for NUL-terminator in build_constructor_string()
A buffer overflow in the Linux kernel dm raid1 module allows attackers to execute arbitrary code or cause 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-2026-89575?
CVE-2026-89575 is a memory corruption vulnerability in Linux, published on 11 Sep 2026. 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:
dm raid1: reserve space for NUL-terminator in build_constructor_string()
Reserve space for the termination NUL after the maximum 20 decimal digits of a long long value to avoid buffer overflow in sprintf().
Which versions are affected by CVE-2026-89575?
How do I fix CVE-2026-89575?
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-2026-89575 being exploited?
There is no known exploitation of CVE-2026-89575 in the wild and no public exploit code.
Sources
Also known as AZL-100328, BELL-CVE-2026-89575, DEBIAN-CVE-2026-89575, GHSA-hrch-mw7x-pxg7, UBUNTU-CVE-2026-89575.