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

Vulnerability from cvelistv5 – Published: 2026-05-06 11:28 – Updated: 2026-05-11 22:21
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
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
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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)
guessed Create a notification for this product.
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-03T14:57:51+00:00",
      "cve": "CVE-2026-43266",
      "id": "CVE-2026-43266",
      "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: EFI/CPER: don\u0027t go past the ARM processor CPER record buffer",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43266.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:19:18Z",
      "cve": "CVE-2026-43266",
      "id": "CVE-2026-43266",
      "initial_release_date": "2026-05-07T02:16:32Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "607",
      "product_status:known_not_affected": "71",
      "product_status:recommended": "273",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43266",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43266.json",
      "version": "12"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.


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.