CVE-2026-43248 (GCVE-0-2026-43248)
Vulnerability from cvelistv5
Published
2026-05-06 11:28
Modified
2026-08-05 12:26
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: vhost: move vdpa group bound check to vhost_vdpa Remove duplication by consolidating these here. This reduces the posibility of a parent driver missing them. While we're at it, fix a bug in vdpa_sim where a valid ASID can be assigned to a group equal to ngroups, causing an out of bound write.
References
Impacted products
Vendor Product Version
Linux Linux Version: bda324fd037a6b0d44da5699574ce741ca161bc4
Version: bda324fd037a6b0d44da5699574ce741ca161bc4
Version: bda324fd037a6b0d44da5699574ce741ca161bc4
Version: bda324fd037a6b0d44da5699574ce741ca161bc4
 Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/vdpa/mlx5/net/mlx5_vnet.c",
            "drivers/vdpa/vdpa_sim/vdpa_sim.c",
            "drivers/vhost/vdpa.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ddb57354634b6ba851b79da45f1de42c646f27d0",
              "status": "affected",
              "version": "bda324fd037a6b0d44da5699574ce741ca161bc4",
              "versionType": "git"
            },
            {
              "lessThan": "7441d35d14d9a3d66d925d90cb73c75394e6d454",
              "status": "affected",
              "version": "bda324fd037a6b0d44da5699574ce741ca161bc4",
              "versionType": "git"
            },
            {
              "lessThan": "406db68f9cb976a8ddfafd631197264f2307e9c9",
              "status": "affected",
              "version": "bda324fd037a6b0d44da5699574ce741ca161bc4",
              "versionType": "git"
            },
            {
              "lessThan": "cd025c1e876b4e262e71398236a1550486a73ede",
              "status": "affected",
              "version": "bda324fd037a6b0d44da5699574ce741ca161bc4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/vdpa/mlx5/net/mlx5_vnet.c",
            "drivers/vdpa/vdpa_sim/vdpa_sim.c",
            "drivers/vhost/vdpa.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.19"
            },
            {
              "lessThan": "5.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.75",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.75",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.16",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.6",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvhost: move vdpa group bound check to vhost_vdpa\n\nRemove duplication by consolidating these here.  This reduces the\nposibility of a parent driver missing them.\n\nWhile we\u0027re at it, fix a bug in vdpa_sim where a valid ASID can be\nassigned to a group equal to ngroups, causing an out of bound write."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable path is reached through local `ioctl()` calls on a `/dev/vhost-vdpa-*` character device, not by network or adjacent traffic.\nAC:L - The attacker controls the ioctl arguments, including the group index and ASID, and no race or external timing condition is required once the device is accessible.\nPR:L - Creating or binding vDPA devices is administrative, but a delegated/local VM or vDPA process with access to the vhost-vdpa device can trigger the ioctl without further kernel capability checks. Choosing the higher severity option, this is Low rather than High.\nUI:N - No victim user action is needed; the local attacker directly opens the device, becomes vhost owner, and issues the ioctl.\nS:U - The impact is corruption of host kernel memory from a local host device interface, which is a standard kernel privilege/security-domain impact rather than a VM escape or separate authority crossing.\nC:H - The missing group bound permits out-of-bounds kernel heap access in the parent set_group_asid path, and such memory corruption can reasonably be developed into kernel memory disclosure.\nI:H - The bug permits an out-of-bounds kernel write of ASID/group state or adjacent locking/state fields, making kernel memory corruption and potential control-flow or privilege manipulation plausible.\nA:H - Even without full exploitation, the out-of-bounds write can corrupt kernel heap state and can reasonably crash or panic the kernel."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:26:51.590Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ddb57354634b6ba851b79da45f1de42c646f27d0"
        },
        {
          "url": "https://git.kernel.org/stable/c/7441d35d14d9a3d66d925d90cb73c75394e6d454"
        },
        {
          "url": "https://git.kernel.org/stable/c/406db68f9cb976a8ddfafd631197264f2307e9c9"
        },
        {
          "url": "https://git.kernel.org/stable/c/cd025c1e876b4e262e71398236a1550486a73ede"
        }
      ],
      "title": "vhost: move vdpa group bound check to vhost_vdpa",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43248",
    "datePublished": "2026-05-06T11:28:39.578Z",
    "dateReserved": "2026-05-01T14:12:55.996Z",
    "dateUpdated": "2026-08-05T12:26:51.590Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.