5.5

CVE-2026-43089: linux

CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2026-43089DEBIAN-CVE-2026-43089
Published 06-05-2026Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2026-43089 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.5% 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
0.13%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 39 · Related 39
OPENSUSE-SU-2026:21388-1SUSE-SU-2026:22521-1SUSE-SU-2026:22522-1SUSE-SU-2026:22665-1SUSE-SU-2026:22666-1SUSE-SU-2026:22742-1

Timeline

  1. 06-05-2026
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: xfrm_user: fix info leak in build_mapping() struct xfrm_usersa_id has a one-byte padding hole after the proto field, which ends up never getting set to zero before copying out to userspace. Fix that up by zeroing out the whole structure before setting individual variables.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

0.00 pp

From 0.13% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.13%

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 | < 6.8.0-136.136
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1061.64
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4, < 521385cbd50ca9474396d88462fcdfa6489685d9 | ≥ 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4, < c2779ae9a3e5a044e5ccd564681511bbbcc5fc0f | ≥ 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4, < 72a8de41c3eb4dcf22bf3b674ea38fb2f75d6f32 | ≥ 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4, < d3125c541a96fb3c0fc7210112684baf22b6c24d | ≥ 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4, < 5a1a4b049ddde41466ccac0daeec326254b133f2 | ≥ 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4, < f779a6b6cdb6e12baa0663063ac59ab2a8f20c0c | ≥ 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4, < 700c9622b23c33b5933e6dcea816492c064e4e10 | ≥ 3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4, < 1beb76b2053b68c491b78370794b8ff63c8f8c02 | 2.6.29
  • linux_kernel≥ 2.6.29.1, < 6.6.136 | ≥ 6.7, < 6.12.83 | ≥ 6.13, < 6.18.24 | ≥ 6.19, < 6.19.14 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6 | 7.0:rc7
Debian1 product
  • linux< 6.1.176-1 | < 6.12.85-1 | < 6.19.14-1

3 vendors · 160 products

References

42 links
Show all 42 references