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CVE-2026-43040

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.253, 5.15.203, 6.1.168, 6.6.134, 6.12.81, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 31910575a9de61e78065e93846e8e7a4894a18bf · fixed in 1da9023f6b071a38e5430ffbce4b70b2b1ac4f9c; From 31910575a9de61e78065e93846e8e7a4894a18bf · fixed in 2fe4d0ba690a69ad6ae9f7ab9bdc96e02610b648; From 31910575a9de61e78065e93846e8e7a4894a18bf · fixed in 11d7fe97421cfc81549940c20ed5ac9472d6db05; From 31910575a9de61e78065e93846e8e7a4894a18bf · fixed in 7f56d87e527bb5a13c3e8b0d5840cb6332822f6d; From 31910575a9de61e78065e93846e8e7a4894a18bf · fixed in 4f810c686fde509d1cdaa706322d9d2531f8f1a4; From 31910575a9de61e78065e93846e8e7a4894a18bf · fixed in b485eef3d97b7aae55ce669b6de555ec81f3d21c; From 31910575a9de61e78065e93846e8e7a4894a18bf · fixed in ef3645606e4a635d5062a492f22b7f490852ee67; From 31910575a9de61e78065e93846e8e7a4894a18bf · fixed in ae05340ccaa9d347fe85415609e075545bec589f

  • Linux Linux

    2.6.24

  • KernelLinux

    From 2.6.24 · fixed in 5.10.253; From 5.11.0 · fixed in 5.15.203; From 5.16.0 · fixed in 6.1.168; From 6.2.0 · fixed in 6.6.134; From 6.7.0 · fixed in 6.12.81; From 6.13.0 · fixed in 6.18.22; From 6.19.0 · fixed in 6.19.12

References 8

git.kernel.org