CVE-2026-63917High· 8.8▾ TwilightIn 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 …
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 48.4 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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.
Linux >= 61220ab349485d911083d0b7990ccd3db6c63297 < 0cdce7618464f7fb06f461e8f4ad575cb1d570f4Linux >= 61220ab349485d911083d0b7990ccd3db6c63297 < f5c68875e25f331e497ddfbe81e2d8163a87f136Linux >= 61220ab349485d911083d0b7990ccd3db6c63297 < d9c5eecdb3c740e65038651db7c686b10d76d1bcLinux >= 61220ab349485d911083d0b7990ccd3db6c63297 < f1e89a943ee574d0f2f16246eb3f2d7330fdeb03Linux >= 61220ab349485d911083d0b7990ccd3db6c63297 < 225b467e3b631f38be22e4b38062a1fed02fdd21Linux >= 61220ab349485d911083d0b7990ccd3db6c63297 < fc32be9ac2788524c6b24efd681cce7a6e731a92Linux >= 61220ab349485d911083d0b7990ccd3db6c63297 < ee1778ba0f5cb53be771f97017d01eb356c797bfLinux >= 61220ab349485d911083d0b7990ccd3db6c63297 < 11b326fb0a374f4654f9be22d0f0f7abd9f7d3feLinux 3.15Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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