7.1

CVE-2026-43040: linux Missing Initialization of Resource

CVSS: 7.1v3.1HighModified
AliasesUBUNTU-CVE-2026-43040DEBIAN-CVE-2026-43040
Published 01-05-2026Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2026-43040 is a high (CVSS 7.1) Missing Initialization of Resource vulnerability in linux. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.5% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.1/10
010
High · v3.1 (NVD)
EPSS score
0.17%
0%100%
Low · +0.05 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 41 · Related 39
MGASA-2026-0108MGASA-2026-0110OPENSUSE-SU-2026:20965-1SUSE-SU-2026:22099-1SUSE-SU-2026:22108-1SUSE-SU-2026:22112-1

Timeline

  1. 01-05-2026
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: net: ipv6: ndisc: fix ndisc_ra_useropt to initialize nduseropt_padX fields to zero to prevent an info-leak When processing Router Advertisements with user options the kernel builds an RTM_NEWNDUSEROPT netlink message. The nduseroptmsg struct has three padding fields that are never zeroed and can leak kernel data The fix is simple, just zeroes the padding fields.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

+0.05 pp

From 0.12% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.17%

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≥ 31910575a9de61e78065e93846e8e7a4894a18bf, < 1da9023f6b071a38e5430ffbce4b70b2b1ac4f9c | ≥ 31910575a9de61e78065e93846e8e7a4894a18bf, < 2fe4d0ba690a69ad6ae9f7ab9bdc96e02610b648 | ≥ 31910575a9de61e78065e93846e8e7a4894a18bf, < 11d7fe97421cfc81549940c20ed5ac9472d6db05 | ≥ 31910575a9de61e78065e93846e8e7a4894a18bf, < 7f56d87e527bb5a13c3e8b0d5840cb6332822f6d | ≥ 31910575a9de61e78065e93846e8e7a4894a18bf, < 4f810c686fde509d1cdaa706322d9d2531f8f1a4 | ≥ 31910575a9de61e78065e93846e8e7a4894a18bf, < b485eef3d97b7aae55ce669b6de555ec81f3d21c | ≥ 31910575a9de61e78065e93846e8e7a4894a18bf, < ef3645606e4a635d5062a492f22b7f490852ee67 | ≥ 31910575a9de61e78065e93846e8e7a4894a18bf, < ae05340ccaa9d347fe85415609e075545bec589f | 2.6.24
  • linux_kernel≥ 2.6.24, < 5.10.253 | ≥ 5.11, < 5.15.203 | ≥ 5.16, < 6.1.168 | ≥ 6.2, < 6.6.134 | ≥ 6.7, < 6.12.81 | ≥ 6.13, < 6.18.22 | ≥ 6.19, < 6.19.12 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.12-1

3 vendors · 160 products

References

42 links
Show all 42 references