CVE-2026-43040
High
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.
SeverityHigh
CVSS7.1
Exploit probability—
Product
Linux Kernel
PublishedMay 1, 2026
First seenMay 1, 2026
Weakness typeCWE-909CWE-909
How to fix
Update
- linux linux_kernel5.10.253, 5.15.203, 6.1.168, 6.6.134, 6.12.81, 6.18.22, 6.19.12 or later
Patches
- git.kernel.org/stable/c/11d7fe97421cfc81549940c20ed5ac9472d6db05
- git.kernel.org/stable/c/1da9023f6b071a38e5430ffbce4b70b2b1ac4f9c
- git.kernel.org/stable/c/2fe4d0ba690a69ad6ae9f7ab9bdc96e02610b648
- git.kernel.org/stable/c/4f810c686fde509d1cdaa706322d9d2531f8f1a4
- git.kernel.org/stable/c/7f56d87e527bb5a13c3e8b0d5840cb6332822f6d
- git.kernel.org/stable/c/ae05340ccaa9d347fe85415609e075545bec589f
- git.kernel.org/stable/c/b485eef3d97b7aae55ce669b6de555ec81f3d21c
- git.kernel.org/stable/c/ef3645606e4a635d5062a492f22b7f490852ee67
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 2.6.24 ≤ v < 5.10.253, 5.11 ≤ v < 5.15.203, 5.16 ≤ v < 6.1.168, 6.2 ≤ v < 6.6.134, 6.7 ≤ v < 6.12.81, 6.13 ≤ v < 6.18.22, 6.19 ≤ v < 6.19.12, 7.0 | 5.10.253, 5.15.203, 6.1.168, 6.6.134, 6.12.81, 6.18.22, 6.19.12 |
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