CVE-2025-40293
iommufd: Don't overflow during division for dirty tracking
Vexday Risk Score
3Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS —EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
08 Dec 2025Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
In the Linux kernel, the following vulnerability has been resolved:
iommufd: Don't overflow during division for dirty tracking
If pgshift is 63 then BITS_PER_TYPE(*bitmap->bitmap) * pgsize will overflow
to 0 and this triggers divide by 0.
In this case the index should just be 0, so reorganize things to divide
by shift and avoid hitting any overflows.
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/07105e61882ff4a7d58db63cc5f9e90c6c60506chttps://git.kernel.org/stable/c/4c8a4f1d34eced168cc0b3a3dfe7b6dcc2090f69https://git.kernel.org/stable/c/cb30dfa75d55eced379a42fd67bd5fb7ec38555ehttps://git.kernel.org/stable/c/dbf316fc90aa954dcd5440817f4b944627ed63e0https://git.kernel.org/stable/c/de7f2c67ceb1941b05b04ac35458a03e93cc57b1