{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "2f74f09bce4f8d0236f20174a6daae63e10fe733"
            },
            {
              "fixed": "c80113dcfc807308f5ab33847fae77e07531aeb8"
            },
            {
              "fixed": "ca2aad8771aa9091bc9e42e7d546bd40b72ddcd4"
            },
            {
              "fixed": "a68d22902a6916e10ee235fee609239004e129d0"
            },
            {
              "fixed": "64eb63f573f497553e1a0c388bbcdd639e0f0704"
            },
            {
              "fixed": "be10c1bdf64a39832998f54900aa309b3917abcf"
            },
            {
              "fixed": "25b290624b0e3d2f0f90238709ee0b6009b9fde8"
            },
            {
              "fixed": "45766863baf899059e75595dd3cb1116467f2095"
            },
            {
              "fixed": "eae21beecb95a3b69ee5c38a659f774e171d730e"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.13.0"
            },
            {
              "fixed": "5.10.252"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.202"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.165"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.128"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.75"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.16"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43266.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nEFI/CPER: don't go past the ARM processor CPER record buffer\n\nThere's a logic inside GHES/CPER to detect if the section_length\nis too small, but it doesn't detect if it is too big.\n\nCurrently, if the firmware receives an ARM processor CPER record\nstating that a section length is big, kernel will blindly trust\nsection_length, producing a very long dump. For instance, a 67\nbytes record with ERR_INFO_NUM set 46198 and section length\nset to 854918320 would dump a lot of data going a way past the\nfirmware memory-mapped area.\n\nFix it by adding a logic to prevent it to go past the buffer\nif ERR_INFO_NUM is too big, making it report instead:\n\n\t[Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 1\n\t[Hardware Error]: event severity: recoverable\n\t[Hardware Error]:  Error 0, type: recoverable\n\t[Hardware Error]:   section_type: ARM processor error\n\t[Hardware Error]:   MIDR: 0xff304b2f8476870a\n\t[Hardware Error]:   section length: 854918320, CPER size: 67\n\t[Hardware Error]:   section length is too big\n\t[Hardware Error]:   firmware-generated error record is incorrect\n\t[Hardware Error]:   ERR_INFO_NUM is 46198\n\n[ rjw: Subject and changelog tweaks ]",
  "id": "CVE-2026-43266",
  "modified": "2026-07-15T01:48:53.704656920Z",
  "published": "2026-05-06T11:28:52.238Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/25b290624b0e3d2f0f90238709ee0b6009b9fde8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/45766863baf899059e75595dd3cb1116467f2095"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/64eb63f573f497553e1a0c388bbcdd639e0f0704"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a68d22902a6916e10ee235fee609239004e129d0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/be10c1bdf64a39832998f54900aa309b3917abcf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c80113dcfc807308f5ab33847fae77e07531aeb8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ca2aad8771aa9091bc9e42e7d546bd40b72ddcd4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eae21beecb95a3b69ee5c38a659f774e171d730e"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43266.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43266"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "EFI/CPER: don't go past the ARM processor CPER record buffer"
}