5.5

CVE-2026-43171: linux Integer Underflow (Wrap or Wraparound)

CVSS: 5.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-43171DEBIAN-CVE-2026-43171
Published 06-05-2026Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2026-43171 is a medium (CVSS 5.5) Integer Underflow (Wrap or Wraparound) vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 5.1% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.16%
0%100%
Low · +0.04 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 36 · Related 36
OPENSUSE-SU-2026:21388-1SUSE-SU-2026:22433-1SUSE-SU-2026:22436-1SUSE-SU-2026:22458-1SUSE-SU-2026:22460-1SUSE-SU-2026:22742-1

Timeline

  1. 06-05-2026
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

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 ]

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

5%

Versus all other CVEs

30-day change

+0.04 pp

From 0.12% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.16%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu157 products
  • linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-134.134
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1060.63
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9, < 02de64ab54b4bb0f1b21bb324aeff3b08612be33 | ≥ 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9, < 0e09b522f2622841389c3b2f9ac4969e35c0809d | ≥ 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9, < 64ae5aaa7ac93c83da456039e8ec747bfa8a7cff | ≥ 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9, < 5a9b1dda8481b82851a655c3bcc5b44879b95334 | ≥ 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9, < 7780c0bad2a3a70a8c0113a33c02f4151d901eb3 | ≥ 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9, < a8419f5f2c5f2d80848ddabb2b95cf0da84a5f91 | ≥ 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9, < 54e131db4cdffd946db890ff33ff2647053fd4f6 | ≥ 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9, < 55cc6fe5716f678f06bcb95140882dfa684464ec | 5.7
  • 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
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.6-1

3 vendors · 160 products

References

37 links
Show all 37 references