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CVE-2025-40293· NVD / CVE Program· CNA Linux

iommufd: Don't overflow during division for dirty tracking

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.

—No exploit Fix available
Published
Dec 7, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 9th percentile
CWE
—
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Action score

0

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Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Noroxi analysis

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Affected systems

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Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 6.1affected
    • 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1 and later · before 07105e61882ff4a7d58db63cc5f9e90c6c60506caffected · git
    • 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1 and later · before 4c8a4f1d34eced168cc0b3a3dfe7b6dcc2090f69affected · git
    • 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1 and later · before de7f2c67ceb1941b05b04ac35458a03e93cc57b1affected · git
    • 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1 and later · before dbf316fc90aa954dcd5440817f4b944627ed63e0affected · git
    • 58ccf0190d19d9a8a41f8a02b9e06742b58df4a1 and later · before cb30dfa75d55eced379a42fd67bd5fb7ec38555eaffected · git
    • before 6.1not affected · semver
    • 6.1.159 and later · up to and including 6.1.*not affected · semver
    • 6.6.117 and later · up to and including 6.6.*not affected · semver
    • 6.12.58 and later · up to and including 6.12.*not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.159-16.1.159-1
Debian:13linuxbefore 6.12.63-16.12.63-1
Debian:14linuxbefore 6.17.8-16.17.8-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

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    40Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux07105e61882ff4a7d58db63cc5f9e90c6c60506cVendor (CNA)
Linux Linux4c8a4f1d34eced168cc0b3a3dfe7b6dcc2090f69Vendor (CNA)
Linux Linuxcb30dfa75d55eced379a42fd67bd5fb7ec38555eVendor (CNA)
Linux Linuxdbf316fc90aa954dcd5440817f4b944627ed63e0Vendor (CNA)
Linux Linuxde7f2c67ceb1941b05b04ac35458a03e93cc57b1Vendor (CNA)
debian:linux6.1.159-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

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Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records