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ip6: vti: Use ip6_tnl.net in vti6_changelink().

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

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
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