What’s Vulnerable › Vulnerabilities

CVE-2025-40293: iommufd: Don't overflow during division for dirty tracking

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-08 · updated 2026-10-14

Description

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 kernel: 6.1 — fixed in 6.18

How to fix

Upgrade to a fixed version: Linux kernel 6.18. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/07105e61882ff4a7d58db63cc5f9e90c6c60506c
• https://git.kernel.org/stable/c/4c8a4f1d34eced168cc0b3a3dfe7b6dcc2090f69
• https://git.kernel.org/stable/c/cb30dfa75d55eced379a42fd67bd5fb7ec38555e
• https://git.kernel.org/stable/c/dbf316fc90aa954dcd5440817f4b944627ed63e0
• https://git.kernel.org/stable/c/de7f2c67ceb1941b05b04ac35458a03e93cc57b1

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