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GHSA-VX5Q-9X62-9QQG

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

In the Linux kernel, the following vulnerability has been resolved:

iommufd: Break the loop on failure in iommufd_fault_fops_read()

On a copy_to_user() failure inside the inner list_for_each_entry, only the inner loop breaks; the outer while re-fetches the just-restored fault group and retries the failing copy_to_user() forever, spinning the reader at 100% CPU with fault->mutex held.

Check rc after the inner loop and break the outer while as well.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64290"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:09Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Break the loop on failure in iommufd_fault_fops_read()\n\nOn a copy_to_user() failure inside the inner list_for_each_entry, only the\ninner loop breaks; the outer while re-fetches the just-restored fault group\nand retries the failing copy_to_user() forever, spinning the reader at 100%\nCPU with fault-\u003emutex held.\n\nCheck rc after the inner loop and break the outer while as well.",
  "id": "GHSA-vx5q-9x62-9qqg",
  "modified": "2026-07-25T12:31:29Z",
  "published": "2026-07-25T12:31:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64290"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/172fc8b19825a0f5884c38f2289188284e2d45ee"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5539da127d03c1f6c2e2a49fdfbe331a0ccbdea8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f66c16b175509642ee7082df57c9bf3deaebae1a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-64290 (GCVE-0-2026-64290)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-07-25 08:49

Title

iommufd: Break the loop on failure in iommufd_fault_fops_read()

Summary

In the Linux kernel, the following vulnerability has been resolved: iommufd: Break the loop on failure in iommufd_fault_fops_read() On a copy_to_user() failure inside the inner list_for_each_entry, only the inner loop breaks; the outer while re-fetches the just-restored fault group and retries the failing copy_to_user() forever, spinning the reader at 100% CPU with fault->mutex held. Check rc after the inner loop and break the outer while as well.

Severity

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/5539da127d03c1f6c…
https://git.kernel.org/stable/c/f66c16b175509642e…
https://git.kernel.org/stable/c/172fc8b19825a0f58…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 07838f7fd529c8a6de44b601d4b7057e6c8d36ed , < 5539da127d03c1f6c2e2a49fdfbe331a0ccbdea8 (git) Affected: 07838f7fd529c8a6de44b601d4b7057e6c8d36ed , < f66c16b175509642ee7082df57c9bf3deaebae1a (git) Affected: 07838f7fd529c8a6de44b601d4b7057e6c8d36ed , < 172fc8b19825a0f5884c38f2289188284e2d45ee (git)
Linux	Linux	Affected: 6.11 Unaffected: 0 , < 6.11 (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/iommu/iommufd/eventq.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "07838f7fd529c8a6de44b601d4b7057e6c8d36ed",
              "versionType": "git"
            },
            {
              "lessThan": "172fc8b19825a0f5884c38f2289188284e2d45ee",
              "status": "affected",
              "version": "07838f7fd529c8a6de44b601d4b7057e6c8d36ed",
              "versionType": "git"
            }
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        },
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          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
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              "lessThan": "6.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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            },
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              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
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        }
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      "cpeApplicability": [
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              "cpeMatch": [
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                  "versionEndExcluding": "6.18.39",
                  "versionStartIncluding": "6.11",
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                  "versionStartIncluding": "6.11",
                  "vulnerable": true
                }
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              "negate": false,
              "operator": "OR"
            }
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Break the loop on failure in iommufd_fault_fops_read()\n\nOn a copy_to_user() failure inside the inner list_for_each_entry, only the\ninner loop breaks; the outer while re-fetches the just-restored fault group\nand retries the failing copy_to_user() forever, spinning the reader at 100%\nCPU with fault-\u003emutex held.\n\nCheck rc after the inner loop and break the outer while as well."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-25T08:49:30.049Z",
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        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/f66c16b175509642ee7082df57c9bf3deaebae1a"
        },
        {
          "url": "https://git.kernel.org/stable/c/172fc8b19825a0f5884c38f2289188284e2d45ee"
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      "title": "iommufd: Break the loop on failure in iommufd_fault_fops_read()",
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    "cveId": "CVE-2026-64290",
    "datePublished": "2026-07-25T08:49:30.049Z",
    "dateReserved": "2026-07-19T15:36:31.778Z",
    "dateUpdated": "2026-07-25T08:49:30.049Z",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

GHSA-VX5Q-9X62-9QQG

CVE-2026-64290 (GCVE-0-2026-64290)

Tags

Sightings

Nomenclature