CVE-2026-43040

HIGH

net: ipv6: ndisc: fix ndisc_ra_useropt to initialize nduseropt_padX fields to zero to prevent an info-leak

Title source: cna

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.

References (10)

Core 10

Core References

Vendor Advisory

https://cert-portal.siemens.com/productcert/html/ssa-019113.html

Vendor Advisory

https://cert-portal.siemens.com/productcert/html/ssa-082556.html

https://git.kernel.org/stable/c/1da9023f6b071a38e5430ffbce4b70b2b1ac4f9c

https://git.kernel.org/stable/c/2fe4d0ba690a69ad6ae9f7ab9bdc96e02610b648

https://git.kernel.org/stable/c/11d7fe97421cfc81549940c20ed5ac9472d6db05

https://git.kernel.org/stable/c/7f56d87e527bb5a13c3e8b0d5840cb6332822f6d

https://git.kernel.org/stable/c/4f810c686fde509d1cdaa706322d9d2531f8f1a4

https://git.kernel.org/stable/c/b485eef3d97b7aae55ce669b6de555ec81f3d21c

https://git.kernel.org/stable/c/ef3645606e4a635d5062a492f22b7f490852ee67

https://git.kernel.org/stable/c/ae05340ccaa9d347fe85415609e075545bec589f

Scores

CVSS v3 7.1

EPSS 0.0012

EPSS Percentile 2.4%

Attack Vector LOCAL

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

Details

CWE

CWE-909

Status published

Products (27)

linux/Kernel 2.6.24 - 5.10.253linux

linux/Kernel 5.11.0 - 5.15.203linux

linux/Kernel 5.16.0 - 6.1.168linux

linux/Kernel 6.13.0 - 6.18.22linux

linux/Kernel 6.19.0 - 6.19.12linux

linux/Kernel 6.2.0 - 6.6.134linux

linux/Kernel 6.7.0 - 6.12.81linux

Linux/Linux < 2.6.24

Linux/Linux 2.6.24

Linux/Linux 31910575a9de61e78065e93846e8e7a4894a18bf - 11d7fe97421cfc81549940c20ed5ac9472d6db05

... and 17 more

Published May 01, 2026

Tracked Since May 01, 2026