Riskcovery

CVE-2025-40293

iommufd: Don't overflow during division for dirty tracking

State
Published
Severity
Not scored
Published
Dec 8, 2025
Updated
May 11, 2026
Reserved
Apr 16, 2025

Read the record on cve.org

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1 to before 07105e61882ff4a7d58db63cc5f9e90c6c60506cAffected
  • 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1 to before 4c8a4f1d34eced168cc0b3a3dfe7b6dcc2090f69Affected
  • 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1 to before de7f2c67ceb1941b05b04ac35458a03e93cc57b1Affected
  • 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1 to before dbf316fc90aa954dcd5440817f4b944627ed63e0Affected
  • 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1 to before cb30dfa75d55eced379a42fd67bd5fb7ec38555eAffected
LinuxLinux
  • 6.1Affected
  • before 6.1Not affected
  • 6.1.159 through 6.1.*Not affected
  • 6.6.117 through 6.6.*Not affected
  • 6.12.58 through 6.12.*Not affected
  • 6.17.8 through 6.17.*Not affected
  • 6.18 and laterNot affected

References

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