ipv6: fix fib6 walker UAF on seq stop
In the Linux kernel, the following vulnerability has been resolved: ipv6: fix fib6 walker UAF on seq stop ipv6_route_iter_active() treats a walker in FWS_U at the table root as already unlinked. fib6_del_route() can move a still-linked walker into that same state when the current leaf is the last route at the root, so ipv6_route_native_seq_stop() skips fib6_walker_unlink(). The seq private object can then be freed while it remains on net->ipv6.fib6_walkers. A later route deletion walks the dangling list and uses the freed walker. Use the list head as membership state and reinitialize it when unlinking. Keep the existing w->node check so a never-started iterator with a zeroed private object is not treated as linked. The same stop helper is used by /proc/net/ipv6_route and by the BPF ipv6_route iterator. The BPF show path only widens the race.
CVE-2026-97940
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-2026-97940
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": "8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7",
"lessThan": "9a3f73d62c86271614eda4c43315230896a37018",
"versionType": "git"
},
{
"status": "affected",
"version": "8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7",
"lessThan": "63407cddabc5992b5ac03af165559f4a1968a032",
"versionType": "git"
},
{
"status": "affected",
"version": "8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7",
"lessThan": "05b687ee04f816658f4a9cf586f4d2f129157943",
"versionType": "git"
},
{
"status": "affected",
"version": "8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7",
"lessThan": "14fdaba201fdff92a3e45994e02bccda409cb19d",
"versionType": "git"
},
{
"status": "affected",
"version": "8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7",
"lessThan": "0eede1689610e9eeaf729ba86fd1321799eb91a0",
"versionType": "git"
},
{
"status": "affected",
"version": "8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7",
"lessThan": "b89b691dd00bf39b9ba39ab9446f8c62f419fa7b",
"versionType": "git"
},
{
"status": "affected",
"version": "8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7",
"lessThan": "4553cfafa8d05c4ce20b1d18f79d9bb3b303fc02",
"versionType": "git"
},
{
"status": "affected",
"version": "8d2ca1d7b5c3e63b3a8a81ae99015b615c5f2bf7",
"lessThan": "19b4ed644d68098cc62ab612727f40d30f43476c",
"versionType": "git"
}
],
"programFiles": [
"net/ipv6/ip6_fib.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.7",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv6/ip6_fib.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-97940
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #38083 · Revision 1
- Added to Heist Feed
- Publisher date