Executive Summary

This vulnerability exists in the Linux kernel's IPv6 Neighbor Discovery (ndisc) component. Specifically, when processing Router Advertisements that include user options, the kernel constructs a netlink message (RTM_NEWNDUSEROPT) using a structure called nduseroptmsg. This structure contains three padding fields that were not initialized to zero, which could lead to leakage of kernel memory data.

The vulnerability is fixed by ensuring these padding fields are zeroed out before use, preventing any unintended information disclosure.

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Impact Analysis

This vulnerability can lead to an information leak where sensitive kernel memory data might be exposed through uninitialized padding fields in netlink messages. An attacker could potentially use this leaked information to gain insights into the kernel's memory layout or other sensitive data, which might aid in further attacks or exploitation.

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Mitigation Strategies

The vulnerability is fixed by zeroing the padding fields in the nduseroptmsg struct when processing Router Advertisements with user options.

To mitigate this vulnerability immediately, update your Linux kernel to a version that includes this fix.

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