CVE-2026-43040

Vulnerability overview

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.

Affected product and versions

Product

Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP

Affected versions

>= 31910575a9de61e78065e93846e8e7a4894a18bf < 1da9023f6b071a38e5430ffbce4b70b2b1ac4f9c, >= 31910575a9de61e78065e93846e8e7a4894a18bf < 2fe4d0ba690a69ad6ae9f7ab9bdc96e02610b648, >= 31910575a9de61e78065e93846e8e7a4894a18bf < 11d7fe97421cfc81549940c20ed5ac9472d6db05, >= 31910575a9de61e78065e93846e8e7a4894a18bf < 7f56d87e527bb5a13c3e8b0d5840cb6332822f6d, >= 31910575a9de61e78065e93846e8e7a4894a18bf < 4f810c686fde509d1cdaa706322d9d2531f8f1a4, >= 31910575a9de61e78065e93846e8e7a4894a18bf < b485eef3d97b7aae55ce669b6de555ec81f3d21c, >= 31910575a9de61e78065e93846e8e7a4894a18bf < ef3645606e4a635d5062a492f22b7f490852ee67, >= 31910575a9de61e78065e93846e8e7a4894a18bf < ae05340ccaa9d347fe85415609e075545bec589f, >= 2.6.24, >= V3.1.6, >= V3.1.5, >= 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

Fixed versions

5.10.253, 5.15.203, 6.1.168, 6.6.134, 6.12.81, 6.18.22, 6.19.12

Technical data

CVSS vector

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

CWE

CWE-909