ip6: vti: Use ip6_tnl.net in vti6_changelink().
In the Linux kernel, the following vulnerability has been resolved: ip6: vti: Use ip6_tnl.net in vti6_changelink(). ip netns add ns1 ip netns add ns2 ip -n ns1 link add vti6_test type vti6 remote ::1 local ::2 key 7 ip -n ns1 link set vti6_test netns ns2 ip -n ns2 link set vti6_test type vti6 remote ::3 local ::4 key 9 ip netns del ns2 ip netns del ns1 [ 132.495484] ------------[ cut here ]------------ [ 132.497609] kernel BUG at net/core/dev.c:12376! Commit 61220ab34948 ("vti6: Enable namespace changing") dropped NETIF_F_NETNS_LOCAL from vti6 devices. A vti6 tunnel can then move through IFLA_NET_NS_FD. After the move dev_net(dev) points at the new netns while t->net stays at the creation netns. vti6_changelink() and vti6_update() still use dev_net(dev) and dev_net(t->dev). They unlink from one per netns hash and relink into another. The creation netns is left with a stale entry. cleanup_net() of that netns later walks freed memory. Reachable from an unprivileged user namespace (unshare --user --map-root-user --net). Cross tenant scope on container hosts.
CVE-2026-63917
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-2026-63917
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": "61220ab349485d911083d0b7990ccd3db6c63297",
"lessThan": "0cdce7618464f7fb06f461e8f4ad575cb1d570f4",
"versionType": "git"
},
{
"status": "affected",
"version": "61220ab349485d911083d0b7990ccd3db6c63297",
"lessThan": "f5c68875e25f331e497ddfbe81e2d8163a87f136",
"versionType": "git"
},
{
"status": "affected",
"version": "61220ab349485d911083d0b7990ccd3db6c63297",
"lessThan": "d9c5eecdb3c740e65038651db7c686b10d76d1bc",
"versionType": "git"
},
{
"status": "affected",
"version": "61220ab349485d911083d0b7990ccd3db6c63297",
"lessThan": "f1e89a943ee574d0f2f16246eb3f2d7330fdeb03",
"versionType": "git"
},
{
"status": "affected",
"version": "61220ab349485d911083d0b7990ccd3db6c63297",
"lessThan": "225b467e3b631f38be22e4b38062a1fed02fdd21",
"versionType": "git"
},
{
"status": "affected",
"version": "61220ab349485d911083d0b7990ccd3db6c63297",
"lessThan": "fc32be9ac2788524c6b24efd681cce7a6e731a92",
"versionType": "git"
},
{
"status": "affected",
"version": "61220ab349485d911083d0b7990ccd3db6c63297",
"lessThan": "ee1778ba0f5cb53be771f97017d01eb356c797bf",
"versionType": "git"
},
{
"status": "affected",
"version": "61220ab349485d911083d0b7990ccd3db6c63297",
"lessThan": "11b326fb0a374f4654f9be22d0f0f7abd9f7d3fe",
"versionType": "git"
}
],
"programFiles": [
"net/ipv6/ip6_vti.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.259",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.210",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"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/ip6_vti.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-63917
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40891 · Revision 1
- Added to Heist Feed
- Publisher date