CVE-2026-63969 Details
Description
In the Linux kernel, the following vulnerability has been resolved: ipv6: fix possible infinite loop in rt6_fill_node() Sashiko reported this issue [1]. Apply the same fix as commit f8d8ce1b515a ("ipv6: fix possible infinite loop in fib6_info_uses_dev()"). Writers holding tb6_lock can list_del_rcu(&rt->fib6_siblings) without waiting for RCU readers; rt->fib6_siblings.next then still points into the old ring and this softirq-side walker never reaches &rt->fib6_siblings, causing a CPU stall. fib6_del_route() always WRITE_ONCE()s rt->fib6_nsiblings to 0 before list_del_rcu(), so an inside-loop check is a reliable detach signal. [1] https://sashiko.dev/#/patchset/20260526020227.4857-1-jiayuan.chen%40linux.dev
A vulnerability in the Linux kernel's IPv6 routing can lead to a potential infinite loop, causing a CPU stall. This issue occurs in the 'rt6_fill_node' function, where improper handling of the 'fib6_siblings' list can create a soft lockup. The problem arises when writers holding the 'tb6_lock' remove entries from the 'fib6_siblings' list without waiting for RCU readers to finish, leaving the list in a state that the softirq-side walker cannot process, effectively stalling the CPU. The vulnerability affects the Linux kernel stable tree.
Users can apply the patch available in the Linux kernel stable Git repository to address this vulnerability. Instructions for downloading the patched version are available on the repository's release page.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No CVSS 3.x data is available for this CVE.
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
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Weakness Enumeration
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Affected Products
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Change History
1 change record found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 19, 2026 | New CVE Received | kernel.org |