CVE-2026-43040

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

State: Published
Severity: Not scored
Published: May 1, 2026
Updated: Oct 15, 2026
Reserved: May 1, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	31910575a9de61e78065e93846e8e7a4894a18bf to before 1da9023f6b071a38e5430ffbce4b70b2b1ac4f9cAffected 31910575a9de61e78065e93846e8e7a4894a18bf to before 2fe4d0ba690a69ad6ae9f7ab9bdc96e02610b648Affected 31910575a9de61e78065e93846e8e7a4894a18bf to before 11d7fe97421cfc81549940c20ed5ac9472d6db05Affected 31910575a9de61e78065e93846e8e7a4894a18bf to before 7f56d87e527bb5a13c3e8b0d5840cb6332822f6dAffected 31910575a9de61e78065e93846e8e7a4894a18bf to before 4f810c686fde509d1cdaa706322d9d2531f8f1a4Affected 31910575a9de61e78065e93846e8e7a4894a18bf to before b485eef3d97b7aae55ce669b6de555ec81f3d21cAffected 31910575a9de61e78065e93846e8e7a4894a18bf to before ef3645606e4a635d5062a492f22b7f490852ee67Affected 31910575a9de61e78065e93846e8e7a4894a18bf to before ae05340ccaa9d347fe85415609e075545bec589fAffected
LinuxLinux	2.6.24Affected before 2.6.24Not affected 5.10.253 through 5.10.Not affected 5.15.203 through 5.15.Not affected 6.1.168 through 6.1.Not affected 6.6.134 through 6.6.Not affected 6.12.81 through 6.12.Not affected 6.18.22 through 6.18.Not affected 6.19.12 through 6.19.*Not affected 7.0 and laterNot affected

Product

Versions

LinuxLinux

31910575a9de61e78065e93846e8e7a4894a18bf to before 1da9023f6b071a38e5430ffbce4b70b2b1ac4f9cAffected
31910575a9de61e78065e93846e8e7a4894a18bf to before 2fe4d0ba690a69ad6ae9f7ab9bdc96e02610b648Affected
31910575a9de61e78065e93846e8e7a4894a18bf to before 11d7fe97421cfc81549940c20ed5ac9472d6db05Affected
31910575a9de61e78065e93846e8e7a4894a18bf to before 7f56d87e527bb5a13c3e8b0d5840cb6332822f6dAffected
31910575a9de61e78065e93846e8e7a4894a18bf to before 4f810c686fde509d1cdaa706322d9d2531f8f1a4Affected
31910575a9de61e78065e93846e8e7a4894a18bf to before b485eef3d97b7aae55ce669b6de555ec81f3d21cAffected
31910575a9de61e78065e93846e8e7a4894a18bf to before ef3645606e4a635d5062a492f22b7f490852ee67Affected
31910575a9de61e78065e93846e8e7a4894a18bf to before ae05340ccaa9d347fe85415609e075545bec589fAffected

LinuxLinux

2.6.24Affected
before 2.6.24Not affected
5.10.253 through 5.10.*Not affected
5.15.203 through 5.15.*Not affected
6.1.168 through 6.1.*Not affected
6.6.134 through 6.6.*Not affected
6.12.81 through 6.12.*Not affected
6.18.22 through 6.18.*Not affected
6.19.12 through 6.19.*Not affected
7.0 and laterNot affected

References

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