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

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Summary

CVECVE-2026-43266
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 12:16:47 UTC
Updated2026-05-08 20:46:52 UTC
DescriptionIn 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 ]

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2f74f09bce4f8d0236f20174a6daae63e10fe733 c80113dcfc807308f5ab33847fae77e07531aeb8 git Not specified
CNA Linux Linux affected 2f74f09bce4f8d0236f20174a6daae63e10fe733 ca2aad8771aa9091bc9e42e7d546bd40b72ddcd4 git Not specified
CNA Linux Linux affected 2f74f09bce4f8d0236f20174a6daae63e10fe733 a68d22902a6916e10ee235fee609239004e129d0 git Not specified
CNA Linux Linux affected 2f74f09bce4f8d0236f20174a6daae63e10fe733 64eb63f573f497553e1a0c388bbcdd639e0f0704 git Not specified
CNA Linux Linux affected 2f74f09bce4f8d0236f20174a6daae63e10fe733 be10c1bdf64a39832998f54900aa309b3917abcf git Not specified
CNA Linux Linux affected 2f74f09bce4f8d0236f20174a6daae63e10fe733 25b290624b0e3d2f0f90238709ee0b6009b9fde8 git Not specified
CNA Linux Linux affected 2f74f09bce4f8d0236f20174a6daae63e10fe733 45766863baf899059e75595dd3cb1116467f2095 git Not specified
CNA Linux Linux affected 2f74f09bce4f8d0236f20174a6daae63e10fe733 eae21beecb95a3b69ee5c38a659f774e171d730e git Not specified
CNA Linux Linux affected 4.13 Not specified
CNA Linux Linux unaffected 4.13 semver Not specified
CNA Linux Linux unaffected 5.10.252 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.202 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.165 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.128 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.75 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.16 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.6 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

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