{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/vdpa/mlx5/core/mlx5_vdpa.h",
            "drivers/vdpa/mlx5/core/mr.c",
            "drivers/vdpa/mlx5/core/resources.c",
            "drivers/vdpa/vdpa_sim/vdpa_sim.c",
            "drivers/vdpa/vdpa_user/iova_domain.c",
            "drivers/vhost/iotlb.c",
            "drivers/vhost/vdpa.c",
            "drivers/vhost/vhost.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ae128dd19040ee06a4f8143c7ced4d18080d7a9a",
              "status": "affected",
              "version": "0bbe30668d89ec8a309f28ced6d092c90fb23e8c",
              "versionType": "git"
            },
            {
              "lessThan": "1ed35ac7f3fe2b4396bdd29ac3a7f0ebc0829e94",
              "status": "affected",
              "version": "0bbe30668d89ec8a309f28ced6d092c90fb23e8c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/vdpa/mlx5/core/mlx5_vdpa.h",
            "drivers/vdpa/mlx5/core/mr.c",
            "drivers/vdpa/mlx5/core/resources.c",
            "drivers/vdpa/vdpa_sim/vdpa_sim.c",
            "drivers/vdpa/vdpa_user/iova_domain.c",
            "drivers/vhost/iotlb.c",
            "drivers/vhost/vdpa.c",
            "drivers/vhost/vhost.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.7"
            },
            {
              "lessThan": "5.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.9",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvhost_iotlb: bound map allocation in add_range\n\nvhost_iotlb_add_range_ctx() only retires an old entry when the table\nhas a non-zero limit, has exactly reached that limit and has\nVHOST_IOTLB_FLAG_RETIRE set. Non-retiring tables can keep allocating\nentries after reaching their configured limit.\n\nExisting vhost devices allocate their IOTLB with max_iotlb_entries from\nvhost.c, which defaults to 2048 and is tunable by module parameter. Use\nthe caller-provided limit at the allocation point instead of adding a\nseparate default in the common IOTLB helper, and reject non-positive\nvalues in vhost paths that can report an error.\n\nOther vhost IOTLB users should not create zero-limit tables when entries\ncan be populated from userspace or guest-controlled requests. Add\ncaller-side max_iotlb_entries parameters for mlx5 vDPA, VDUSE and\nvhost-vDPA. Reject non-positive VDUSE and vhost-vDPA values, and require\nat least two entries for vdpa_sim and mlx5 vDPA paths that install\nfull-range mappings, since those mappings are split into two IOTLB\nentries.\n\nHandle full-range mappings in the common helper by checking that the\nIOTLB can hold both split entries before inserting the first half. This\navoids returning an error after leaving a half mapping behind.\n\nWhen the table is full, keep the existing retire behavior for retiring\ntables and return -ENOSPC for non-retiring tables. Reuse the retired map\nnode instead of freeing it and allocating a replacement, so a stream of\nIOTLB updates cannot keep forcing GFP_ATOMIC allocations after the table\nhas reached its limit. If a zero-limit IOTLB still reaches the common\nhelper, treat it as a configuration error and return -EINVAL.\n\nI found this bug myself, though the patch was written with AI assistance."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The flaw is reached via local VHOST_IOTLB_UPDATE writes on /dev/vhost-* or /dev/vhost-vdpa char devices, or when a KVM guest drives virtio IOTLB misses that the VMM resolves through vhost; it is not triggered by remote network packets.\nAC:L - An attacker reliably floods distinct IOTLB mappings by repeatedly issuing VHOST_IOTLB_UPDATE messages or provoking guest IOTLB misses; no race, rare configuration, or attacker-uncontrollable memory layout is required once vhost IOTLB is active.\nPR:N - A malicious KVM guest can provoke unbounded IOTLB growth through normal virtio IOTLB-miss handling without any host credentials; a host attacker holding the vhost-vdpa/vhost device node also needs no capabilities beyond device access.\nUI:N - Exploitation requires no victim interaction beyond the VM or vhost device already being in use; the attacker programmatically drives the IOTLB update stream in a tight loop.\nS:C - In cloud/KVM deployments, an unprivileged guest VM causes unbounded host-kernel GFP_ATOMIC allocations in vhost_iotlb_add_range_ctx(), crossing the VM/host security boundary to deny service on the hypervisor.\nC:N - The bug causes only unbounded kmalloc of vhost_iotlb_map structures without out-of-bounds access, use-after-free, or information disclosure; successful exploitation does not read kernel memory.\nI:N - No memory corruption or arbitrary write occurs; impact is limited to kernel memory consumption and does not modify data or enable code execution through the allocation flaw itself.\nA:H - Unbounded IOTLB entry allocation or perpetual GFP_ATOMIC kmalloc when tables are at capacity exhausts kernel memory/atomic reserves, causing host OOM, kernel panics, or complete hypervisor denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-25T05:41:56.127Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ae128dd19040ee06a4f8143c7ced4d18080d7a9a"
        },
        {
          "url": "https://git.kernel.org/stable/c/1ed35ac7f3fe2b4396bdd29ac3a7f0ebc0829e94"
        }
      ],
      "title": "vhost_iotlb: bound map allocation in add_range",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74713",
    "datePublished": "2026-08-22T15:33:09.028Z",
    "dateReserved": "2026-08-15T05:44:03.928Z",
    "dateUpdated": "2026-08-25T05:41:56.127Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}