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NVD / CVE Program· CNA Linux

CVE-2026-90242: iommu/vt-d: Fix iopf_refcount leak on RID domain replacement

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.20% (FIRST EPSS).
  • Fixed version: Linux Linux 143cd37ce76527ddd6f6dbac4a89bde31fb8b0dc, 236dd58fabd2e951b940a6ad88b81147899ed311, 243bf1e45e40be4705aae17c5044bf83df5f4a92.

Low priority for now. Upgrade to Linux Linux 143cd37ce76527ddd6f6dbac4a89bde31fb8b0dc, 236dd58fabd2e951b940a6ad88b81147899ed311, 243bf1e45e40be4705aae17c5044bf83df5f4a92 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Fix iopf_refcount leak on RID domain replacement intel_iommu_attach_device() enables IOPF for the new domain but never disables it for the old one. device_block_translation(), called at the start of the function, tears down translation but does not touch any IOPF state; blocking_domain_attach_dev() has to call iopf_for_domain_remove() explicitly before invoking it for exactly this reason. identity_domain_attach_dev() has the same problem. Its comment claims that no PRI handling is needed because the device has been put in the blocking state, but the blocking state and the IOPF reference count are independent of each other. As a result, replacing a domain that has an iopf_handler with another domain at RID level leaks a reference in info->iopf_refcount. The count never drops back to zero, so iopf_queue_remove_device() is never called and iommu_disable_pci_pri() triggers its WARN_ON(info->iopf_refcount) when the device is released. The PASID paths already handle this correctly by way of iopf_for_domain_replace(); convert the two RID paths to do the same. Using the replace helper rather than a bare remove keeps the enable before the disable, so the reference count does not transiently reach zero and evict the device from the IOPF queue.

—No exploit Fix available
Published
Sep 17, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 10th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

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

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Noroxi analysis

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Affected systems

Is your version affected?

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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

    • 6.16affected
    • 17fce9d2336d952b95474248303e5e7d9777f2e0 and later · before 243bf1e45e40be4705aae17c5044bf83df5f4a92affected · git
    • 17fce9d2336d952b95474248303e5e7d9777f2e0 and later · before 143cd37ce76527ddd6f6dbac4a89bde31fb8b0dcaffected · git
    • 17fce9d2336d952b95474248303e5e7d9777f2e0 and later · before 236dd58fabd2e951b940a6ad88b81147899ed311affected · git
    • before 6.16not affected · semver
    • 6.18.57 and later · up to and including 6.18.*not affected · semver
    • 7.2.6 and later · up to and including 7.2.*not affected · semver
    • 7.3 and laternot affected · original_commit_for_fix

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

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    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-90240Sep 17, 2026 · iommu/vt-d: Flush context cache with correct SID when tearing down aliases
    35Monitor
  • ← EarlierCVE-2026-90241Sep 17, 2026 · iommu/vt-d: Tear down scalable-mode context on probe failure
    32Monitor
  • Later →CVE-2026-90243Sep 17, 2026 · iommu/vt-d: Clear Present bit before tearing down copied context entry
    32Monitor

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 Linux143cd37ce76527ddd6f6dbac4a89bde31fb8b0dcVendor (CNA)
Linux Linux236dd58fabd2e951b940a6ad88b81147899ed311Vendor (CNA)
Linux Linux243bf1e45e40be4705aae17c5044bf83df5f4a92Vendor (CNA)
debian:linux7.2.6-1 · Debian:14Package registry (OSV)

Exploit status

No known public exploit

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Research context

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Timeline

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EPSS, last 120 days

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

Patch and commit links

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Credits

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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.

—

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)

—

Attack context

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Change log

  1. Fix✗ → ✓

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References

Show all references (2 more)

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

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