Vulnerability-Lookup

CVE-2026-64292 (GCVE-0-2026-64292)

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

Title

iommufd: Move vevent memory allocation outside spinlock

Summary

In the Linux kernel, the following vulnerability has been resolved: iommufd: Move vevent memory allocation outside spinlock The veventq memory allocation happens inside the spinlock. Given its depth is decided by the user space, this leaves a vulnerability, where userspace can allocate large queues to exhaust atomic memory reserves. Move the allocation outside the spinlock and use GFP_NOWAIT, which can fail fast under memory pressure without dipping into the GFP_ATOMIC reserves or direct-reclaiming from the threaded IRQ handler. On allocation failure, queue the lost_events_header (so userspace learns of the drop) and return -ENOMEM so the caller learns of the kernel-side memory pressure. This is intentionally distinct from the queue-overflow path, which also queues the lost_events_header but returns 0: a full queue is an expected userspace-pacing condition rather than a kernel error. A subsequent change will cap the upper bound of the veventq_depth.

Severity

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/779480ea79551c319…
https://git.kernel.org/stable/c/6c5fc40200cd0a87d…
https://git.kernel.org/stable/c/47443565d10c51366…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: e36ba5ab808ef6237c3148d469c8238674230e2b , < 779480ea79551c31964e74b9aef0e730faa3aa11 (git) Affected: e36ba5ab808ef6237c3148d469c8238674230e2b , < 6c5fc40200cd0a87d66a368eee00df4d1cca946e (git) Affected: e36ba5ab808ef6237c3148d469c8238674230e2b , < 47443565d10c51366c9382dbc8597cd6c460b8a2 (git)
Linux	Linux	Affected: 6.15 Unaffected: 0 , < 6.15 (semver) Unaffected: 6.18.40 , ≤ 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/driver.c"
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "6c5fc40200cd0a87d66a368eee00df4d1cca946e",
              "status": "affected",
              "version": "e36ba5ab808ef6237c3148d469c8238674230e2b",
              "versionType": "git"
            },
            {
              "lessThan": "47443565d10c51366c9382dbc8597cd6c460b8a2",
              "status": "affected",
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              "versionType": "git"
            }
          ]
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          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
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              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
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              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Move vevent memory allocation outside spinlock\n\nThe veventq memory allocation happens inside the spinlock. Given its depth\nis decided by the user space, this leaves a vulnerability, where userspace\ncan allocate large queues to exhaust atomic memory reserves.\n\nMove the allocation outside the spinlock and use GFP_NOWAIT, which can fail\nfast under memory pressure without dipping into the GFP_ATOMIC reserves or\ndirect-reclaiming from the threaded IRQ handler. On allocation failure,\nqueue the lost_events_header (so userspace learns of the drop) and return\n-ENOMEM so the caller learns of the kernel-side memory pressure.\n\nThis is intentionally distinct from the queue-overflow path, which also\nqueues the lost_events_header but returns 0: a full queue is an expected\nuserspace-pacing condition rather than a kernel error.\n\nA subsequent change will cap the upper bound of the veventq_depth."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-25T08:49:31.325Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/779480ea79551c31964e74b9aef0e730faa3aa11"
        },
        {
          "url": "https://git.kernel.org/stable/c/6c5fc40200cd0a87d66a368eee00df4d1cca946e"
        },
        {
          "url": "https://git.kernel.org/stable/c/47443565d10c51366c9382dbc8597cd6c460b8a2"
        }
      ],
      "title": "iommufd: Move vevent memory allocation outside spinlock",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64292",
    "datePublished": "2026-07-25T08:49:31.325Z",
    "dateReserved": "2026-07-19T15:36:31.778Z",
    "dateUpdated": "2026-07-25T08:49:31.325Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-64292",
      "date": "2026-07-26",
      "epss": "0.00198",
      "percentile": "0.09858"
    },
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    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T16:46:25Z",
      "cve": "CVE-2026-64292",
      "id": "CVE-2026-64292",
      "initial_release_date": "2026-07-25T16:46:25Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64292",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64292.json",
      "version": "2"
    }
  }
}

GHSA-GR72-P8G3-6GPC

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: Move vevent memory allocation outside spinlock

The veventq memory allocation happens inside the spinlock. Given its depth is decided by the user space, this leaves a vulnerability, where userspace can allocate large queues to exhaust atomic memory reserves.

Move the allocation outside the spinlock and use GFP_NOWAIT, which can fail fast under memory pressure without dipping into the GFP_ATOMIC reserves or direct-reclaiming from the threaded IRQ handler. On allocation failure, queue the lost_events_header (so userspace learns of the drop) and return -ENOMEM so the caller learns of the kernel-side memory pressure.

This is intentionally distinct from the queue-overflow path, which also queues the lost_events_header but returns 0: a full queue is an expected userspace-pacing condition rather than a kernel error.

A subsequent change will cap the upper bound of the veventq_depth.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-64292"
  ],
  "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: Move vevent memory allocation outside spinlock\n\nThe veventq memory allocation happens inside the spinlock. Given its depth\nis decided by the user space, this leaves a vulnerability, where userspace\ncan allocate large queues to exhaust atomic memory reserves.\n\nMove the allocation outside the spinlock and use GFP_NOWAIT, which can fail\nfast under memory pressure without dipping into the GFP_ATOMIC reserves or\ndirect-reclaiming from the threaded IRQ handler. On allocation failure,\nqueue the lost_events_header (so userspace learns of the drop) and return\n-ENOMEM so the caller learns of the kernel-side memory pressure.\n\nThis is intentionally distinct from the queue-overflow path, which also\nqueues the lost_events_header but returns 0: a full queue is an expected\nuserspace-pacing condition rather than a kernel error.\n\nA subsequent change will cap the upper bound of the veventq_depth.",
  "id": "GHSA-gr72-p8g3-6gpc",
  "modified": "2026-07-25T12:31:29Z",
  "published": "2026-07-25T12:31:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64292"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/47443565d10c51366c9382dbc8597cd6c460b8a2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6c5fc40200cd0a87d66a368eee00df4d1cca946e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/779480ea79551c31964e74b9aef0e730faa3aa11"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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

CVE-2026-64292 (GCVE-0-2026-64292)

GHSA-GR72-P8G3-6GPC

Tags

Sightings

Nomenclature