ipv6: fix possible infinite loop in rt6_fill_node()
Summary
| CVE | CVE-2026-63969 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-07-19 16:17:15 UTC |
| Updated | 2026-07-19 16:17:15 UTC |
| 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 |
Risk And Classification
EPSS: 0.002050000 probability, percentile 0.107250000 (date 2026-07-20)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected d0ec61c9f3583b76aebdbb271f5c0d3fcccd48b2 b014a63d2f2c2c767762b548381882dfb1655529 git | Not specified |
| CNA | Linux | Linux | affected 52da02521ede55fb86546c3fffd9377b3261b91f 279853aec9f58d5cd723e6e5617c1c3337b30383 git | Not specified |
| CNA | Linux | Linux | affected 34a949e7a0869dfa31a40416d2a56973fae1807b c65b1f60237daac7c56c2652e064cc566a45dc81 git | Not specified |
| CNA | Linux | Linux | affected d9ccb18f83ea2bb654289b6ecf014fd267cc988b dc36a04621dcc2447dae428709207810b6c06e14 git | Not specified |
| CNA | Linux | Linux | affected d9ccb18f83ea2bb654289b6ecf014fd267cc988b 5e40de719ee76b8d96e2556ce36dbd3bd07bf37d git | Not specified |
| CNA | Linux | Linux | affected d9ccb18f83ea2bb654289b6ecf014fd267cc988b 9f72412bcf60144f252b0d6205106abf14344abc git | Not specified |
| CNA | Linux | Linux | affected 11edcd026012ac18acee0f1514db3ed1b160fc6f git | Not specified |
| CNA | Linux | Linux | affected 6.1.128 6.1.176 semver | Not specified |
| CNA | Linux | Linux | affected 6.6.75 6.6.143 semver | Not specified |
| CNA | Linux | Linux | affected 6.12.2 6.12.93 semver | Not specified |
| CNA | Linux | Linux | affected 6.11.11 6.12 semver | Not specified |
| CNA | Linux | Linux | affected 6.13 | Not specified |
| CNA | Linux | Linux | unaffected 6.13 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.176 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.143 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.93 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.35 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0.12 7.0.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/c65b1f60237daac7c56c2652e064cc566a45dc81 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/5e40de719ee76b8d96e2556ce36dbd3bd07bf37d | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/b014a63d2f2c2c767762b548381882dfb1655529 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/279853aec9f58d5cd723e6e5617c1c3337b30383 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/dc36a04621dcc2447dae428709207810b6c06e14 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/9f72412bcf60144f252b0d6205106abf14344abc | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.