Vulnerability-Lookup

CVE-2026-64291 (GCVE-0-2026-64291)

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

Title

iommufd: Set veventq_depth upper bound

Summary

In the Linux kernel, the following vulnerability has been resolved: iommufd: Set veventq_depth upper bound iommufd_veventq_alloc() accepts any !0 veventq_depth from userspace, with an upper bound at U32_MAX. This leaves a vulnerability where userspace can allocate excessively large queues to exhaust kernel memory reserves. Cap the veventq_depth (maximum number of entries) to 1 << 19, matching the maximum number of entries in the SMMUv3 EVTQ (the largest use case today).

Severity

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/f565297edf316016b…
https://git.kernel.org/stable/c/e7b5e55652746b122…
https://git.kernel.org/stable/c/6ebf2eb46fbd5b403…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: e36ba5ab808ef6237c3148d469c8238674230e2b , < f565297edf316016be4a1a9e2eb9f39359313f43 (git) Affected: e36ba5ab808ef6237c3148d469c8238674230e2b , < e7b5e55652746b1221b9c10ff80eae8a154101ba (git) Affected: e36ba5ab808ef6237c3148d469c8238674230e2b , < 6ebf2eb46fbd5b40393ff8fbb847ba96925beaff (git)
Linux	Linux	Affected: 6.15 Unaffected: 0 , < 6.15 (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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    "suse_vex": {
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      "current_release_date": "2026-07-25T16:46:27Z",
      "cve": "CVE-2026-64291",
      "id": "CVE-2026-64291",
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      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64291",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64291.json",
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}

GHSA-6GX3-FVX8-MX4P

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: Set veventq_depth upper bound

iommufd_veventq_alloc() accepts any !0 veventq_depth from userspace, with an upper bound at U32_MAX.

This leaves a vulnerability where userspace can allocate excessively large queues to exhaust kernel memory reserves.

Cap the veventq_depth (maximum number of entries) to 1 << 19, matching the maximum number of entries in the SMMUv3 EVTQ (the largest use case today).

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-64291"
  ],
  "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: Set veventq_depth upper bound\n\niommufd_veventq_alloc() accepts any !0 veventq_depth from userspace, with\nan upper bound at U32_MAX.\n\nThis leaves a vulnerability where userspace can allocate excessively large\nqueues to exhaust kernel memory reserves.\n\nCap the veventq_depth (maximum number of entries) to 1 \u003c\u003c 19, matching the\nmaximum number of entries in the SMMUv3 EVTQ (the largest use case today).",
  "id": "GHSA-6gx3-fvx8-mx4p",
  "modified": "2026-07-25T12:31:29Z",
  "published": "2026-07-25T12:31:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64291"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6ebf2eb46fbd5b40393ff8fbb847ba96925beaff"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e7b5e55652746b1221b9c10ff80eae8a154101ba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f565297edf316016be4a1a9e2eb9f39359313f43"
    }
  ],
  "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-2026-64291 (GCVE-0-2026-64291)

GHSA-6GX3-FVX8-MX4P

Tags

Sightings

Nomenclature