Answer in brief
CVE-2026-63968 records a High severity (CVSS 7.5) vulnerability in ipv6: fix possible infinite loop in fib6_select_path(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:linux:linux_kernel:7.1:rc5:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=d0ec61c9f3583b76aebdbb271f5c0d3fcccd48b2 <3948a7d92f7678e89e1776bb2d169afcad63b1ae || >=52da02521ede55fb86546c3fffd9377b3261b91f <c87cd3cb309634bc8f50a54e2079424f219ac21f || >=34a949e7a0869dfa31a40416d2a56973fae1807b <0f7b73c3452635de83b8711b31abdda8e49aad7b || >=d9ccb18f83ea2bb654289b6ecf014fd267cc988b <ab9a10969a907b472a0196d999c08ff7144172e3 || >=d9ccb18f83ea2bb654289b6ecf014fd267cc988b <9b9d5bd6e3d4c9cecab5407604b690684b2532d2 || >=d9ccb18f83ea2bb654289b6ecf014fd267cc988b <9c7da87c2dc860bb17ca1ece942495d28b1ce3b9 || 11edcd026012ac18acee0f1514db3ed1b160fc6f || >=6.1.128 <6.1.176 || >=6.6.75 <6.6.143 || >=6.12.2 <6.12.93 || >=6.11.11 <6.12 | 3948a7d92f7678e89e1776bb2d169afcad63b1ae, c87cd3cb309634bc8f50a54e2079424f219ac21f, 0f7b73c3452635de83b8711b31abdda8e49aad7b, ab9a10969a907b472a0196d999c08ff7144172e3, 9b9d5bd6e3d4c9cecab5407604b690684b2532d2, 9c7da87c2dc860bb17ca1ece942495d28b1ce3b9, 6.1.176, 6.6.143, 6.12.93, 6.12 |
| Linux/Linuxgeneric | 6.13 | Not reported |
Published upstream
Jul 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 30, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: ipv6: fix possible infinite loop in fib6_select_path() Found while auditing the same pattern Sashiko reported in rt6_fill_node() [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(&first->fib6_siblings) without waiting for RCU readers; first->fib6_siblings.next then still points into the old ring and this softirq-side walker never reaches &first->fib6_siblings as its terminator. fib6_purge_rt() always WRITE_ONCE()s first->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
Quoted source text, attributed separately from HOL analysis.