Vulnerability-Lookup

FKIE_CVE-2026-43266

Vulnerability from fkie_nvd - Published: 2026-05-06 12:16 - Updated: 2026-05-08 20:46

Severity ?

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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 ]

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/25b290624b0e3d2f0f90238709ee0b6009b9fde8	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/45766863baf899059e75595dd3cb1116467f2095	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/64eb63f573f497553e1a0c388bbcdd639e0f0704	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a68d22902a6916e10ee235fee609239004e129d0	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/be10c1bdf64a39832998f54900aa309b3917abcf	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c80113dcfc807308f5ab33847fae77e07531aeb8	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ca2aad8771aa9091bc9e42e7d546bd40b72ddcd4	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/eae21beecb95a3b69ee5c38a659f774e171d730e	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "31A910C0-02A8-44D3-BAFE-9E8657D95FED",
              "versionEndExcluding": "5.10.252",
              "versionStartIncluding": "4.13",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "4002FC2B-1456-4666-B240-0EBF590C4671",
              "versionEndExcluding": "5.15.202",
              "versionStartIncluding": "5.11",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              "versionEndExcluding": "6.1.165",
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              "versionEndExcluding": "6.12.75",
              "versionStartIncluding": "6.7",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B",
              "versionEndExcluding": "6.18.16",
              "versionStartIncluding": "6.13",
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            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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  "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 ]"
    }
  ],
  "id": "CVE-2026-43266",
  "lastModified": "2026-05-08T20:46:52.477",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-05-06T12:16:47.647",
  "references": [
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      "tags": [
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      "tags": [
        "Patch"
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    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-05-06 11:28 – Updated: 2026-05-11 22:21

Title

EFI/CPER: don't go past the ARM processor CPER record buffer

Summary

Severity ?

No CVSS data available.

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/c80113dcfc807308f…
https://git.kernel.org/stable/c/ca2aad8771aa9091b…
https://git.kernel.org/stable/c/a68d22902a6916e10…
https://git.kernel.org/stable/c/64eb63f573f497553…
https://git.kernel.org/stable/c/be10c1bdf64a39832…
https://git.kernel.org/stable/c/25b290624b0e3d2f0…
https://git.kernel.org/stable/c/45766863baf899059…
https://git.kernel.org/stable/c/eae21beecb95a3b69…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 2f74f09bce4f8d0236f20174a6daae63e10fe733 , < c80113dcfc807308f5ab33847fae77e07531aeb8 (git) Affected: 2f74f09bce4f8d0236f20174a6daae63e10fe733 , < ca2aad8771aa9091bc9e42e7d546bd40b72ddcd4 (git) Affected: 2f74f09bce4f8d0236f20174a6daae63e10fe733 , < a68d22902a6916e10ee235fee609239004e129d0 (git) Affected: 2f74f09bce4f8d0236f20174a6daae63e10fe733 , < 64eb63f573f497553e1a0c388bbcdd639e0f0704 (git) Affected: 2f74f09bce4f8d0236f20174a6daae63e10fe733 , < be10c1bdf64a39832998f54900aa309b3917abcf (git) Affected: 2f74f09bce4f8d0236f20174a6daae63e10fe733 , < 25b290624b0e3d2f0f90238709ee0b6009b9fde8 (git) Affected: 2f74f09bce4f8d0236f20174a6daae63e10fe733 , < 45766863baf899059e75595dd3cb1116467f2095 (git) Affected: 2f74f09bce4f8d0236f20174a6daae63e10fe733 , < eae21beecb95a3b69ee5c38a659f774e171d730e (git)
Linux	Linux	Affected: 4.13 Unaffected: 0 , < 4.13 (semver) 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)

Show details on NVD website

JSON

To clipboard

{
  "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": [
            {
              "lessThan": "c80113dcfc807308f5ab33847fae77e07531aeb8",
              "status": "affected",
              "version": "2f74f09bce4f8d0236f20174a6daae63e10fe733",
              "versionType": "git"
            },
            {
              "lessThan": "ca2aad8771aa9091bc9e42e7d546bd40b72ddcd4",
              "status": "affected",
              "version": "2f74f09bce4f8d0236f20174a6daae63e10fe733",
              "versionType": "git"
            },
            {
              "lessThan": "a68d22902a6916e10ee235fee609239004e129d0",
              "status": "affected",
              "version": "2f74f09bce4f8d0236f20174a6daae63e10fe733",
              "versionType": "git"
            },
            {
              "lessThan": "64eb63f573f497553e1a0c388bbcdd639e0f0704",
              "status": "affected",
              "version": "2f74f09bce4f8d0236f20174a6daae63e10fe733",
              "versionType": "git"
            },
            {
              "lessThan": "be10c1bdf64a39832998f54900aa309b3917abcf",
              "status": "affected",
              "version": "2f74f09bce4f8d0236f20174a6daae63e10fe733",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "2f74f09bce4f8d0236f20174a6daae63e10fe733",
              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
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              "status": "affected",
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "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": [
            {
              "status": "affected",
              "version": "4.13"
            },
            {
              "lessThan": "4.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "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"
            },
            {
              "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": [
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                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.202",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.165",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.75",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.16",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.6",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "4.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": "2026-05-11T22:21:14.159Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c80113dcfc807308f5ab33847fae77e07531aeb8"
        },
        {
          "url": "https://git.kernel.org/stable/c/ca2aad8771aa9091bc9e42e7d546bd40b72ddcd4"
        },
        {
          "url": "https://git.kernel.org/stable/c/a68d22902a6916e10ee235fee609239004e129d0"
        },
        {
          "url": "https://git.kernel.org/stable/c/64eb63f573f497553e1a0c388bbcdd639e0f0704"
        },
        {
          "url": "https://git.kernel.org/stable/c/be10c1bdf64a39832998f54900aa309b3917abcf"
        },
        {
          "url": "https://git.kernel.org/stable/c/25b290624b0e3d2f0f90238709ee0b6009b9fde8"
        },
        {
          "url": "https://git.kernel.org/stable/c/45766863baf899059e75595dd3cb1116467f2095"
        },
        {
          "url": "https://git.kernel.org/stable/c/eae21beecb95a3b69ee5c38a659f774e171d730e"
        }
      ],
      "title": "EFI/CPER: don\u0027t go past the ARM processor CPER record buffer",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "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": "2026-05-11T22:21:14.159Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2026-43266

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

Tags

Sightings

Nomenclature