CVE-2026-43281 (GCVE-0-2026-43281)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:29 – Updated: 2026-06-01 16:15
VLAI
Title
mailbox: Prevent out-of-bounds access in fw_mbox_index_xlate()
Summary
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.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 2b6d83e2b8b7de82331a6a1dcd64b51020a6031c , < 2c7ff651ec6b660c7c96a36db9328b3232f555d8 (git)
Affected: 2b6d83e2b8b7de82331a6a1dcd64b51020a6031c , < ec0874447895b994182a962d2fee9ef075de5efd (git)
Affected: 2b6d83e2b8b7de82331a6a1dcd64b51020a6031c , < 2662ed331a69c0b551f78af58f12eb629a89a36f (git)
Affected: 2b6d83e2b8b7de82331a6a1dcd64b51020a6031c , < 31c4c67dec3362094a6747a171a4848e98542265 (git)
Affected: 2b6d83e2b8b7de82331a6a1dcd64b51020a6031c , < 01d9a8c2615d436b2b30c19c1afe9fcd5726ff6d (git)
Affected: 2b6d83e2b8b7de82331a6a1dcd64b51020a6031c , < 4caae8168d1b808c7d4ff481295292e3f97f90fb (git)
Affected: 2b6d83e2b8b7de82331a6a1dcd64b51020a6031c , < f50b39fd7c72a8734153644ee945ca0d8b2e65ab (git)
Affected: 2b6d83e2b8b7de82331a6a1dcd64b51020a6031c , < fcd7f96c783626c07ee3ed75fa3739a8a2052310 (git)
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Linux Linux Affected: 3.18
Unaffected: 0 , < 3.18 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.77 , ≤ 6.12.* (semver)
Unaffected: 6.18.16 , ≤ 6.18.* (semver)
Unaffected: 6.19.6 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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            "url": "https://git.kernel.org/stable/c/4caae8168d1b808c7d4ff481295292e3f97f90fb"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ec0874447895b994182a962d2fee9ef075de5efd"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/f50b39fd7c72a8734153644ee945ca0d8b2e65ab"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/fcd7f96c783626c07ee3ed75fa3739a8a2052310"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-125"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-22T16:41:00+00:00",
      "cve": "CVE-2026-43281",
      "id": "CVE-2026-43281",
      "initial_release_date": "2026-05-06T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mailbox: Prevent out-of-bounds access in fw_mbox_index_xlate()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43281.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:19:08Z",
      "cve": "CVE-2026-43281",
      "id": "CVE-2026-43281",
      "initial_release_date": "2026-05-09T02:39:43Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "674",
      "product_status:known_not_affected": "4",
      "product_status:recommended": "273",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43281",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43281.json",
      "version": "11"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.