CVE-2026-43171 Details
Description
In the Linux kernel, the following vulnerability has been resolved: EFI/CPER: don't dump the entire memory region The current logic at cper_print_fw_err() doesn't check if the error record length is big enough to handle offset. On a bad firmware, if the ofset is above the actual record, length -= offset will underflow, making it dump the entire memory. The end result can be: - the logic taking a lot of time dumping large regions of memory; - data disclosure due to the memory dumps; - an OOPS, if it tries to dump an unmapped memory region. Fix it by checking if the section length is too small before doing a hex dump. [ rjw: Subject tweaks ]
A vulnerability in the Linux kernel's EFI/CPER error handling can cause excessive memory dumping, data disclosure, and potential system crashes. The issue arises because the error record length is not properly validated before processing. On faulty firmware, an offset can exceed the actual record length, leading to an underflow that triggers a dump of the entire memory. This flaw can be exploited to disclose sensitive data, cause the system to hang by dumping large memory areas, or induce a crash by attempting to dump unmapped memory regions.
Users can upgrade to the patched version of the Linux kernel where this vulnerability has been addressed. The official Linux kernel Git repository contains the necessary updates. Instructions for downloading the latest stable version can be found on the Linux kernel website.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/02de64ab54b4bb0f1b21bb324aeff3b08612be33 | kernel.org | Patch |
| https://git.kernel.org/stable/c/0e09b522f2622841389c3b2f9ac4969e35c0809d | kernel.org | Patch |
| https://git.kernel.org/stable/c/54e131db4cdffd946db890ff33ff2647053fd4f6 | kernel.org | Patch |
| https://git.kernel.org/stable/c/55cc6fe5716f678f06bcb95140882dfa684464ec | kernel.org | Patch |
| https://git.kernel.org/stable/c/5a9b1dda8481b82851a655c3bcc5b44879b95334 | kernel.org | Patch |
| https://git.kernel.org/stable/c/64ae5aaa7ac93c83da456039e8ec747bfa8a7cff | kernel.org | Patch |
| https://git.kernel.org/stable/c/7780c0bad2a3a70a8c0113a33c02f4151d901eb3 | kernel.org | Patch |
| https://git.kernel.org/stable/c/a8419f5f2c5f2d80848ddabb2b95cf0da84a5f91 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-191 | Integer Underflow (Wrap or Wraparound) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | > 5.7, < 5.10.252 >= 5.11, < 5.15.202 >= 5.16, < 6.1.165 >= 6.2, < 6.6.128 >= 6.7, < 6.12.75 >= 6.13, < 6.18.16 >= 6.19, < 6.19.6 5.7 - 5.7 rc7 |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 13, 2026 | Initial Analysis | [email protected] |
| May 6, 2026 | New CVE Received | kernel.org |