ipv6: fix possible infinite loop in fib6_select_path()
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
CVE-2026-63968
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-63968
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "d0ec61c9f3583b76aebdbb271f5c0d3fcccd48b2",
"lessThan": "3948a7d92f7678e89e1776bb2d169afcad63b1ae",
"versionType": "git"
},
{
"status": "affected",
"version": "52da02521ede55fb86546c3fffd9377b3261b91f",
"lessThan": "c87cd3cb309634bc8f50a54e2079424f219ac21f",
"versionType": "git"
},
{
"status": "affected",
"version": "34a949e7a0869dfa31a40416d2a56973fae1807b",
"lessThan": "0f7b73c3452635de83b8711b31abdda8e49aad7b",
"versionType": "git"
},
{
"status": "affected",
"version": "d9ccb18f83ea2bb654289b6ecf014fd267cc988b",
"lessThan": "ab9a10969a907b472a0196d999c08ff7144172e3",
"versionType": "git"
},
{
"status": "affected",
"version": "d9ccb18f83ea2bb654289b6ecf014fd267cc988b",
"lessThan": "9b9d5bd6e3d4c9cecab5407604b690684b2532d2",
"versionType": "git"
},
{
"status": "affected",
"version": "d9ccb18f83ea2bb654289b6ecf014fd267cc988b",
"lessThan": "9c7da87c2dc860bb17ca1ece942495d28b1ce3b9",
"versionType": "git"
},
{
"status": "affected",
"version": "11edcd026012ac18acee0f1514db3ed1b160fc6f",
"versionType": "git"
},
{
"status": "affected",
"version": "6.1.128",
"lessThan": "6.1.176",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.6.75",
"lessThan": "6.6.143",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.12.2",
"lessThan": "6.12.93",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.11.11",
"lessThan": "6.12",
"versionType": "semver"
}
],
"programFiles": [
"net/ipv6/route.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.176",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.143",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.93",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.35",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.12",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv6/route.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-63968
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40911 · Revision 1
- Added to Heist Feed
- Publisher date