Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2026-43171

Severity CVSS v4.0:
Pending analysis
Type:
CWE-191 Integer Underflow (Wrap or Wraparound)
Publication date:
06/05/2026
Last modified:
13/05/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> EFI/CPER: don&amp;#39;t dump the entire memory region<br /> <br /> The current logic at cper_print_fw_err() doesn&amp;#39;t check if the<br /> error record length is big enough to handle offset. On a bad firmware,<br /> if the ofset is above the actual record, length -= offset will<br /> underflow, making it dump the entire memory.<br /> <br /> The end result can be:<br /> <br /> - the logic taking a lot of time dumping large regions of memory;<br /> - data disclosure due to the memory dumps;<br /> - an OOPS, if it tries to dump an unmapped memory region.<br /> <br /> Fix it by checking if the section length is too small before doing<br /> a hex dump.<br /> <br /> [ rjw: Subject tweaks ]

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
5.50
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.7 (excluding) 5.10.252 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.11 (including) 5.15.202 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.16 (including) 6.1.165 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.2 (including) 6.6.128 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.7 (including) 6.12.75 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.13 (including) 6.18.16 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.19 (including) 6.19.6 (excluding)
cpe:2.3:o:linux:linux_kernel:5.7:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.7:rc7:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools