Answer in brief
CVE-2026-63968 records a Unknown severity 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.
A CVSS score is not reported in the current record. 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.
| 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
Aug 5, 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.
Answer in brief
CVE-2026-63968 records a Unknown severity 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.
A CVSS score is not reported in the current record. 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.
| 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
Aug 5, 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.