CVE-2026-63969: ipv6: fix possible infinite loop in rt6_fill_node()

Awaiting analysis
AliasesUBUNTU-CVE-2026-63969DEBIAN-CVE-2026-63969
Published 19-07-2026Last modified 19-07-2026

Vulnerability summary

CVE-2026-63969 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.21% chance of exploitation in the next 30 days, higher than 11.4% of scored vulnerabilities.

Priority
Insufficient evidence

No CVSS vector published; no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.21%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 25 · Related 25
OPENSUSE-SU-2026:21910-1SUSE-SU-2026:23477-1SUSE-SU-2026:23481-1SUSE-SU-2026:23528-1SUSE-SU-2026:23529-1SUSE-SU-2026:23881-1

Timeline

  1. 19-07-2026
    PublishedVulnerability first disclosed.

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

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.21%

Chance of exploitation in the next 30 days

Percentile

11%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.21% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: not stated in public data.

Ubuntu140 products
  • linux< 6.8.0-146.146 | < 7.0.0-28.28
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 6.8.0-1066.69 | < 7.0.0-1009.9
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.12-1
Linux1 product
  • linux≥ 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 | 6.13

3 vendors · 142 products

References

24 links
Show all 24 references