CVE-2026-43040

HIGH

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 v3.1 Score

7.1
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
HIGH
Published: 5/1/2026Modified: 7/14/2026

Related Intelligence (1)

CRITICALAi

Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP

<p><a href="https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-209-04.json"><strong>View CSAF</strong></a></p> <h2>Summary</h2> <p><strong>Multiple vulnerabilities have been identified in the additional GNU/Linux subsystem of the firmware version V3.1.6 for the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP (incl. SIPLUS variant). Siemens is preparing fix versions and recommend

CVE-2021-41617CVE-2023-28531
CISA Advisories

References (10)

https://git.kernel.org/stable/c/11d7fe97421cfc81549940c20ed5ac9472d6db05Patchhttps://git.kernel.org/stable/c/1da9023f6b071a38e5430ffbce4b70b2b1ac4f9cPatchhttps://git.kernel.org/stable/c/2fe4d0ba690a69ad6ae9f7ab9bdc96e02610b648Patchhttps://git.kernel.org/stable/c/4f810c686fde509d1cdaa706322d9d2531f8f1a4Patchhttps://git.kernel.org/stable/c/7f56d87e527bb5a13c3e8b0d5840cb6332822f6dPatchhttps://git.kernel.org/stable/c/ae05340ccaa9d347fe85415609e075545bec589fPatchhttps://git.kernel.org/stable/c/b485eef3d97b7aae55ce669b6de555ec81f3d21cPatchhttps://git.kernel.org/stable/c/ef3645606e4a635d5062a492f22b7f490852ee67Patchhttps://cert-portal.siemens.com/productcert/html/ssa-019113.htmlhttps://cert-portal.siemens.com/productcert/html/ssa-082556.html