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CVE PROGRAM SOURCE RECORD8.8 High

CVE-2026-63917

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

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 61220ab349485d911083d0b7990ccd3db6c63297 to < 0cdce7618464f7fb06f461e8f4ad575cb1d570f4affected
  • 61220ab349485d911083d0b7990ccd3db6c63297 to < f5c68875e25f331e497ddfbe81e2d8163a87f136affected
  • 61220ab349485d911083d0b7990ccd3db6c63297 to < d9c5eecdb3c740e65038651db7c686b10d76d1bcaffected
  • 61220ab349485d911083d0b7990ccd3db6c63297 to < f1e89a943ee574d0f2f16246eb3f2d7330fdeb03affected
  • 61220ab349485d911083d0b7990ccd3db6c63297 to < 225b467e3b631f38be22e4b38062a1fed02fdd21affected
  • 61220ab349485d911083d0b7990ccd3db6c63297 to < fc32be9ac2788524c6b24efd681cce7a6e731a92affected
  • 61220ab349485d911083d0b7990ccd3db6c63297 to < ee1778ba0f5cb53be771f97017d01eb356c797bfaffected
  • 61220ab349485d911083d0b7990ccd3db6c63297 to < 11b326fb0a374f4654f9be22d0f0f7abd9f7d3feaffected

Linux Linux

Default version status: affected

  • 3.15affected
  • 0 to < 3.15unaffected
  • 5.10.259 to ≤ 5.10.*unaffected
  • 5.15.210 to ≤ 5.15.*unaffected
  • 6.1.176 to ≤ 6.1.*unaffected
  • 6.6.143 to ≤ 6.6.*unaffected
  • 6.12.93 to ≤ 6.12.*unaffected
  • 6.18.35 to ≤ 6.18.*unaffected
  • 7.0.12 to ≤ 7.0.*unaffected
  • 7.1 to ≤ *unaffected

References