CVE-2026-43266 (GCVE-0-2026-43266)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:28 – Updated: 2026-05-06 11:28
VLAI?
Title
EFI/CPER: don't go past the ARM processor CPER record buffer
Summary
In the Linux kernel, the following vulnerability has been resolved: EFI/CPER: don't go past the ARM processor CPER record buffer There's a logic inside GHES/CPER to detect if the section_length is too small, but it doesn't detect if it is too big. Currently, if the firmware receives an ARM processor CPER record stating that a section length is big, kernel will blindly trust section_length, producing a very long dump. For instance, a 67 bytes record with ERR_INFO_NUM set 46198 and section length set to 854918320 would dump a lot of data going a way past the firmware memory-mapped area. Fix it by adding a logic to prevent it to go past the buffer if ERR_INFO_NUM is too big, making it report instead: [Hardware Error]: Hardware error from APEI Generic Hardware Error Source: 1 [Hardware Error]: event severity: recoverable [Hardware Error]: Error 0, type: recoverable [Hardware Error]: section_type: ARM processor error [Hardware Error]: MIDR: 0xff304b2f8476870a [Hardware Error]: section length: 854918320, CPER size: 67 [Hardware Error]: section length is too big [Hardware Error]: firmware-generated error record is incorrect [Hardware Error]: ERR_INFO_NUM is 46198 [ rjw: Subject and changelog tweaks ]
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c80113dcfc807308f5ab33847fae77e07531aeb8 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ca2aad8771aa9091bc9e42e7d546bd40b72ddcd4 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a68d22902a6916e10ee235fee609239004e129d0 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 64eb63f573f497553e1a0c388bbcdd639e0f0704 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < be10c1bdf64a39832998f54900aa309b3917abcf (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 25b290624b0e3d2f0f90238709ee0b6009b9fde8 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 45766863baf899059e75595dd3cb1116467f2095 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < eae21beecb95a3b69ee5c38a659f774e171d730e (git)
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    Linux Linux Unaffected: 5.10.252 , ≤ 5.10.* (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 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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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/firmware/efi/cper-arm.c",
            "drivers/firmware/efi/cper.c",
            "include/linux/cper.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
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        },
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          "product": "Linux",
          "programFiles": [
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            "drivers/firmware/efi/cper.c",
            "include/linux/cper.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.252",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.202",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.165",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.128",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.75",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.16",
              "versionType": "semver"
            },
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              "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": [
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              ],
              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nEFI/CPER: don\u0027t go past the ARM processor CPER record buffer\n\nThere\u0027s a logic inside GHES/CPER to detect if the section_length\nis too small, but it doesn\u0027t 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 ]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-06T11:28:52.238Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/a68d22902a6916e10ee235fee609239004e129d0"
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          "url": "https://git.kernel.org/stable/c/64eb63f573f497553e1a0c388bbcdd639e0f0704"
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      ],
      "title": "EFI/CPER: don\u0027t go past the ARM processor CPER record buffer",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43266",
    "datePublished": "2026-05-06T11:28:52.238Z",
    "dateReserved": "2026-05-01T14:12:55.997Z",
    "dateUpdated": "2026-05-06T11:28:52.238Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-43266\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-06T12:16:47.647\",\"lastModified\":\"2026-05-06T13:07:51.607\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nEFI/CPER: don\u0027t go past the ARM processor CPER record buffer\\n\\nThere\u0027s a logic inside GHES/CPER to detect if the section_length\\nis too small, but it doesn\u0027t 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 ]\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/25b290624b0e3d2f0f90238709ee0b6009b9fde8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/45766863baf899059e75595dd3cb1116467f2095\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/64eb63f573f497553e1a0c388bbcdd639e0f0704\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a68d22902a6916e10ee235fee609239004e129d0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/be10c1bdf64a39832998f54900aa309b3917abcf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c80113dcfc807308f5ab33847fae77e07531aeb8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ca2aad8771aa9091bc9e42e7d546bd40b72ddcd4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eae21beecb95a3b69ee5c38a659f774e171d730e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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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

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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.



Detection rules are retrieved from Rulezet.