Strix
26.1K

CVE-2026-63969

UnknownEPSS 0.21%

Last modified

CVE-2026-63969 is a vulnerability of currently unknown severity. 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. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

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

Metrics

EPSS Probability
0.21%

10.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= d0ec61c9f3583b76aebdbb271f5c0d3fcccd48b2, < b014a63d2f2c2c767762b548381882dfb1655529; >= 52da02521ede55fb86546c3fffd9377b3261b91f, < 279853aec9f58d5cd723e6e5617c1c3337b30383; >= 34a949e7a0869dfa31a40416d2a56973fae1807b, < c65b1f60237daac7c56c2652e064cc566a45dc81; >= d9ccb18f83ea2bb654289b6ecf014fd267cc988b, < dc36a04621dcc2447dae428709207810b6c06e14; >= d9ccb18f83ea2bb654289b6ecf014fd267cc988b, < 5e40de719ee76b8d96e2556ce36dbd3bd07bf37d; >= d9ccb18f83ea2bb654289b6ecf014fd267cc988b, < 9f72412bcf60144f252b0d6205106abf14344abc; 11edcd026012ac18acee0f1514db3ed1b160fc6f; >= 6.1.128, < 6.1.176; >= 6.6.75, < 6.6.143; >= 6.12.2, < 6.12.93; >= 6.11.11, < 6.12
LinuxLinux6.13

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is 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
How severe is CVE-2026-63969?
Severity scoring for CVE-2026-63969 is pending analysis. The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.
How do I fix CVE-2026-63969?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

Related CVEs from 2026

View all 2026CVEs →

Are you affected by CVE-2026-63969?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST