CVE-2025-37846 arm64: mops: Do not dereference src reg for a set operation
A local attacker can trigger a kernel out-of-bounds access via MOPS SET operations, potentially causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-37846?
CVE-2025-37846 is a high-severity vulnerability in Linux kernel, published on 9 May 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:
arm64: mops: Do not dereference src reg for a set operation
The source register is not used for SET* and reading it can result in a UBSAN out-of-bounds array access error, specifically when the MOPS exception is taken from a SET* sequence with XZR (reg 31) as the source. Architecturally this is the only case where a src/dst/size field in the ESR can be reported as 31.
Prior to 2de451a329cf662b the code in do_el0_mops() was benign as the use of pt_regs_read_reg() prevented the out-of-bounds access.
Weakness: CWE-125
Which versions are affected by CVE-2025-37846?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-37846?
Apply the vendor's patch.
Is CVE-2025-37846 being exploited?
There is no known exploitation of CVE-2025-37846 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-37846, DEBIAN-CVE-2025-37846, GHSA-rjhh-hgmx-6v66, ROOT-OS-UBUNTU-2404-CVE-2025-37846, UBUNTU-CVE-2025-37846.