CVE-2026-43281

Status: ModifiedHigh (7.1)—

In the Linux kernel, the following vulnerability has been resolved:

mailbox: Prevent out-of-bounds access in fw_mbox_index_xlate()

Although it is guided that `#mbox-cells` must be at least 1, there are many instances of `#mbox-cells = <0>;` in the device tree. If that is the case and the corresponding mailbox controller does not provide `fw_xlate` and of_xlate` function pointers, `fw_mbox_index_xlate()` will be used by default and out-of-bounds accesses could occur due to lack of bounds check in that function.

CVSS

Version: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Base score: 7.1

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.17%
Percentile among all scored CVEs: 5
Score date: 10/5/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1068 Exploitation for Privilege Escalationprivilege escalation75 %
Primary impactT1059 Command and Scripting Interpreterexecution60 %
Secondary impactT1499.004 Application or System Exploitationimpact55 %

Acceso local sin interacción del usuario (AV:L/PR:L/UI:N) en kernel. Out-of-bounds permite escalada de privilegios o DoS. Ejecución de código/comandos mediante acceso a memoria del kernel.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Execution Prevention Threat Intelligence Program Restrict Web-Based Content Privileged Account Management Limit Software Installation Filter Network Traffic

Affected technologies (1)

Linux — Linux Kernel

CWEs

CWE-125

References

Raw JSON (NVD)

Show

{
  "id": "CVE-2026-43281",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.1,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.2,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2b6d83e2b8b7de82331a6a1dcd64b51020a6031c",
              "lessThan": "2c7ff651ec6b660c7c96a36db9328b3232f555d8",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2b6d83e2b8b7de82331a6a1dcd64b51020a6031c",
              "lessThan": "ec0874447895b994182a962d2fee9ef075de5efd",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2b6d83e2b8b7de82331a6a1dcd64b51020a6031c",
              "lessThan": "2662ed331a69c0b551f78af58f12eb629a89a36f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2b6d83e2b8b7de82331a6a1dcd64b51020a6031c",
              "lessThan": "31c4c67dec3362094a6747a171a4848e98542265",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2b6d83e2b8b7de82331a6a1dcd64b51020a6031c",
              "lessThan": "01d9a8c2615d436b2b30c19c1afe9fcd5726ff6d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2b6d83e2b8b7de82331a6a1dcd64b51020a6031c",
              "lessThan": "4caae8168d1b808c7d4ff481295292e3f97f90fb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2b6d83e2b8b7de82331a6a1dcd64b51020a6031c",
              "lessThan": "f50b39fd7c72a8734153644ee945ca0d8b2e65ab",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2b6d83e2b8b7de82331a6a1dcd64b51020a6031c",
              "lessThan": "fcd7f96c783626c07ee3ed75fa3739a8a2052310",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/mailbox/mailbox.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.18"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "3.18",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.258",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.167",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.130",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.77",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.16",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "6.19.6",
              "versionType": "semver",
              "lessThanOrEqual": "6.19.*"
            },
            {
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/mailbox/mailbox.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-05-06T12:16:49.587",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/01d9a8c2615d436b2b30c19c1afe9fcd5726ff6d",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/2662ed331a69c0b551f78af58f12eb629a89a36f",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/2c7ff651ec6b660c7c96a36db9328b3232f555d8",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/31c4c67dec3362094a6747a171a4848e98542265",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4caae8168d1b808c7d4ff481295292e3f97f90fb",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ec0874447895b994182a962d2fee9ef075de5efd",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f50b39fd7c72a8734153644ee945ca0d8b2e65ab",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fcd7f96c783626c07ee3ed75fa3739a8a2052310",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmailbox: Prevent out-of-bounds access in fw_mbox_index_xlate()\n\nAlthough it is guided that `#mbox-cells` must be at least 1, there are\nmany instances of `#mbox-cells = <0>;` in the device tree. If that is\nthe case and the corresponding mailbox controller does not provide\n`fw_xlate` and of_xlate` function pointers, `fw_mbox_index_xlate()` will\nbe used by default and out-of-bounds accesses could occur due to lack of\nbounds check in that function."
    }
  ],
  "lastModified": "2026-06-17T10:49:18.173",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "DF38EC6B-E140-4F00-8705-4F8DFC83958D",
              "versionEndExcluding": "6.1.167",
              "versionStartIncluding": "3.18.1"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C57BB918-DF28-46B3-94F7-144176841267",
              "versionEndExcluding": "6.6.130",
              "versionStartIncluding": "6.2"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B3D12E00-E42D-4056-B354-BAD4903C03A5",
              "versionEndExcluding": "6.12.77",
              "versionStartIncluding": "6.7"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B",
              "versionEndExcluding": "6.18.16",
              "versionStartIncluding": "6.13"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67",
              "versionEndExcluding": "6.19.6",
              "versionStartIncluding": "6.19"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:3.18:-:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "2C941823-DB24-432E-8F78-90665662756A"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:3.18:rc2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E909F0A0-2398-4420-AA63-605C42F5CADF"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:3.18:rc3:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "77E4C479-2D2C-4009-8D71-18AF50454D7B"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:3.18:rc4:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "C5AE67DB-5E94-4439-98E9-761ACCC48A4A"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:3.18:rc5:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "777DE673-1457-420F-AAAF-9B1E3AC79328"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:3.18:rc6:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "222D33AD-EC2D-4813-83C2-B904534BFCFE"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:3.18:rc7:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "A5F9AEA5-34CE-4ED3-9821-6C7435CE3320"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}