What is CVE-2026-63969?

CVE-2026-63969 is a unscored severity Linux kernel vulnerability, affecting Linux kernel versions from 6.1.128 onward and patched in 6.1.176, 6.6.143, 6.12.93 and others. CVE-2026-63969 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-63969?

CVE-2026-63969 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2026-63969?

Yes, CVE-2026-63969 has been patched. Fixed versions include 6.1.176, 6.6.143, 6.12.93 and others. If you are running Linux kernel 6.1.128 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-63969 actively exploited?

CVE-2026-63969 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-63969

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

Package Linux Kernel

Published 2026-07-19

Last modified 2026-07-19

Patch available

Yes

Affected versions

Linux kernel versions 6.1.128, 6.6.75, 6.12.2, 6.11.11, 6.13 and later are affected. Fixed in 6.1.176, 6.6.143, 6.12.93, 6.18.35, 7.0.12, 7.1 and their respective stable series.

Affected from

≥ 6.1.128 ≥ 6.6.75 ≥ 6.12.2 ≥ 6.11.11 ≥ 6.13

Fixed in

✓ 6.1.176 6.1.x ✓ 6.6.143 6.6.x ✓ 6.12.93 6.12.x ✓ 6.18.35 6.18.x ✓ 7.0.12 7.0.x ✓ 7.1

References

6 total

Showing 5 of 6 references View all on NVD

Frequently asked questions

What is CVE-2026-63969?

CVE-2026-63969 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.1.128 onward and has been patched in 6.1.176, 6.6.143, 6.12.93 and others. CVE-2026-63969 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2026-63969?

Yes — CVE-2026-63969 has been patched. Fixed versions include 6.1.176, 6.6.143, 6.12.93 and others. If you are running Linux kernel 6.1.128 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-63969 actively exploited?

No — CVE-2026-63969 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.