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Vulnerability record · CVE-2026-43040 · published 1 May 2026

CVE-2026-43040: Linux kernel vulnerability

Linux · Linux Kernel

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.

7.1 CVSS 3.1 High EPSS 0.17% · top 93.9% CWE-909 · CWE-909
7.1CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References
14 Jul 2026Last modified by NVD

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:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/11d7fe97421cfc81549940c20ed5ac9472d6db05 Patch
https://git.kernel.org/stable/c/1da9023f6b071a38e5430ffbce4b70b2b1ac4f9c Patch
https://git.kernel.org/stable/c/2fe4d0ba690a69ad6ae9f7ab9bdc96e02610b648 Patch
https://git.kernel.org/stable/c/4f810c686fde509d1cdaa706322d9d2531f8f1a4 Patch
https://git.kernel.org/stable/c/7f56d87e527bb5a13c3e8b0d5840cb6332822f6d Patch
https://git.kernel.org/stable/c/ae05340ccaa9d347fe85415609e075545bec589f Patch
https://git.kernel.org/stable/c/b485eef3d97b7aae55ce669b6de555ec81f3d21c Patch
https://git.kernel.org/stable/c/ef3645606e4a635d5062a492f22b7f490852ee67 Patch
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://cert-portal.siemens.com/productcert/html/ssa-082556.html

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Source: NIST National Vulnerability Database (record CVE-2026-43040), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.