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vhost_iotlb: bound map allocation in add_range

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: vhost_iotlb: bound map allocation in add_range vhost_iotlb_add_range_ctx() only retires an old entry when the table has a non-zero limit, has exactly reached that limit and has VHOST_IOTLB_FLAG_RETIRE set. Non-retiring tables can keep allocating entries after reaching their configured limit. Existing vhost devices allocate their IOTLB with max_iotlb_entries from vhost.c, which defaults to 2048 and is tunable by module parameter. Use the caller-provided limit at the allocation point instead of adding a separate default in the common IOTLB helper, and reject non-positive values in vhost paths that can report an error. Other vhost IOTLB users should not create zero-limit tables when entries can be populated from userspace or guest-controlled requests. Add caller-side max_iotlb_entries parameters for mlx5 vDPA, VDUSE and vhost-vDPA. Reject non-positive VDUSE and vhost-vDPA values, and require at least two entries for vdpa_sim and mlx5 vDPA paths that install full-range mappings, since those mappings are split into two IOTLB entries. Handle full-range mappings in the common helper by checking that the IOTLB can hold both split entries before inserting the first half. This avoids returning an error after leaving a half mapping behind. When the table is full, keep the existing retire behavior for retiring tables and return -ENOSPC for non-retiring tables. Reuse the retired map node instead of freeing it and allocati

Announced Source revision 1
Original source ↗

CVE-2026-74713

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-74713

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "0bbe30668d89ec8a309f28ced6d092c90fb23e8c",
        "lessThan": "96da3e1439e7d689eea09fc9b6227fbab5b88ac3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0bbe30668d89ec8a309f28ced6d092c90fb23e8c",
        "lessThan": "eb70200e34772572ad08e99291b08afea6522111",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0bbe30668d89ec8a309f28ced6d092c90fb23e8c",
        "lessThan": "b57164cdddb46924ff9fa191b727ca097744de88",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0bbe30668d89ec8a309f28ced6d092c90fb23e8c",
        "lessThan": "ae128dd19040ee06a4f8143c7ced4d18080d7a9a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0bbe30668d89ec8a309f28ced6d092c90fb23e8c",
        "lessThan": "1ed35ac7f3fe2b4396bdd29ac3a7f0ebc0829e94",
        "versionType": "git"
      }
    ],
    "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"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.7"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.7",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.114",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.57",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.9",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "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"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74713

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#46591 · Revision 1
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Publisher date
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