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

Type: advisorySources: OSV

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 ]

Products
Kernel
Affected versions
Not specified
Fixed versions
5.10.252, 5.15.202, 6.1.165, 6.12.75, 6.18.16, 6.19.6, 6.6.128
CVEs
CVE-2026-43266
Confirmed fixed CVEs
Not specified
Updated in this feed
4 Nov 2026, 23:11 UTC · Revision 1

Source evidence

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

core-osv · Original source

Published 6 May 2026, 11:28 UTC

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 ]

osv:CVE-2026-43266

Kernel

Fixed versions: 5.10.252, 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.16, 6.19.6

Complete source record
{
  "id": "2db92999ffb2132c73ff17b38731b27d8e3b1b70bbbe8fc75a1c9e0ea28d7576",
  "url": "https://osv.dev/vulnerability/CVE-2026-43266",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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 ]",
    "evidence": "osv:CVE-2026-43266",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.252",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.202",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.165",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.128",
            "evidence": "/affected/1/ranges"
          },
          {
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            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.16",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.19.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-43266",
      "aliases": [
        "CVE-2026-43266"
      ],
      "affected": [
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        {
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                {
                  "introduced": "4.13.0"
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                {
                  "fixed": "5.10.252"
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            },
            {
              "type": "ECOSYSTEM",
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                {
                  "introduced": "5.11.0"
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                {
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            {
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                {
                  "introduced": "5.16.0"
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                  "introduced": "6.13.0"
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            {
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          ],
          "package": {
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            "ecosystem": "Linux"
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          "database_specific": {
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          }
        }
      ],
      "modified": "2026-10-28T02:30:40.335555497Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/25b290624b0e3d2f0f90238709ee0b6009b9fde8",
        "https://git.kernel.org/stable/c/45766863baf899059e75595dd3cb1116467f2095",
        "https://git.kernel.org/stable/c/64eb63f573f497553e1a0c388bbcdd639e0f0704",
        "https://git.kernel.org/stable/c/a68d22902a6916e10ee235fee609239004e129d0",
        "https://git.kernel.org/stable/c/be10c1bdf64a39832998f54900aa309b3917abcf",
        "https://git.kernel.org/stable/c/c80113dcfc807308f5ab33847fae77e07531aeb8",
        "https://git.kernel.org/stable/c/ca2aad8771aa9091bc9e42e7d546bd40b72ddcd4",
        "https://git.kernel.org/stable/c/eae21beecb95a3b69ee5c38a659f774e171d730e",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43266.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-43266",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43266.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-43266",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 507875,
  "published_at": "2026-05-06T11:28:52.238+00:00"
}