{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "e36ba5ab808ef6237c3148d469c8238674230e2b"
            },
            {
              "fixed": "f565297edf316016be4a1a9e2eb9f39359313f43"
            },
            {
              "fixed": "e7b5e55652746b1221b9c10ff80eae8a154101ba"
            },
            {
              "fixed": "6ebf2eb46fbd5b40393ff8fbb847ba96925beaff"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.15.0"
            },
            {
              "fixed": "6.18.39"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64291.json"
  },
  "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": "CVE-2026-64291",
  "modified": "2026-08-18T03:31:01.732885553Z",
  "published": "2026-07-25T08:49:30.686Z",
  "references": [
    {
      "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"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64291.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64291"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "iommufd: Set veventq_depth upper bound"
}