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I. Basic Information for CVE-2026-43040
Vulnerability Information

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Vulnerability Title
net: ipv6: ndisc: fix ndisc_ra_useropt to initialize nduseropt_padX fields to zero to prevent an info-leak
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
LinuxLinux 31910575a9de61e78065e93846e8e7a4894a18bf ~ 1da9023f6b071a38e5430ffbce4b70b2b1ac4f9c -
LinuxLinux 2.6.24 -
II. Public POCs for CVE-2026-43040
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III. Intelligence Information for CVE-2026-43040
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IV. Related Vulnerabilities
V. Comments for CVE-2026-43040

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