CVE-2025-37740 jfs: add sanity check for agwidth in dbMount
A missing sanity check in the Linux kernel JFS filesystem allows a local attacker to cause a divide-by-zero error, resulting in a system crash.
- 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-2025-37740?
CVE-2025-37740 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 1 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:
jfs: add sanity check for agwidth in dbMount
The width in dmapctl of the AG is zero, it trigger a divide error when calculating the control page level in dbAllocAG.
To avoid this issue, add a check for agwidth in dbAllocAG.
Weakness: CWE-369
Which versions are affected by CVE-2025-37740?
It affects 2 products.
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2025-37740?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-37740 being exploited?
There is no known exploitation of CVE-2025-37740 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as BELL-CVE-2025-37740, DEBIAN-CVE-2025-37740, GHSA-c7x8-xx5v-964j, ROOT-OS-DEBIAN-12-CVE-2025-37740, ROOT-OS-UBUNTU-2204-CVE-2025-37740, ROOT-OS-UBUNTU-2404-CVE-2025-37740 and 1 more.