CVE-2026-63917

CVE CVE-2026-63917EUVD EUVD-2026-45690Published 2026-07-19T14:55:20.000ZLast changed 2026-08-05T12:37:11.000ZCVSS 8.8

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 61220ab349485d911083d0b7990ccd3db6c63297 <225b467e3b631f38be22e4b38062a1fed02fdd21; patch: 6.12.93; patch: 5.15.210; patch: 7.0.12; patch: 6.18.35; 61220ab349485d911083d0b7990ccd3db6c63297 <f5c68875e25f331e497ddfbe81e2d8163a87f136; 61220ab349485d911083d0b7990ccd3db6c63297 <fc32be9ac2788524c6b24efd681cce7a6e731a92; 61220ab349485d911083d0b7990ccd3db6c63297 <11b326fb0a374f4654f9be22d0f0f7abd9f7d3fe; patch: 6.6.143; 3.15; patch: 7.1; patch: 0; patch: 6.1.176; 61220ab349485d911083d0b7990ccd3db6c63297 <d9c5eecdb3c740e65038651db7c686b10d76d1bc; 61220ab349485d911083d0b7990ccd3db6c63297 <f1e89a943ee574d0f2f16246eb3f2d7330fdeb03; 61220ab349485d911083d0b7990ccd3db6c63297 <ee1778ba0f5cb53be771f97017d01eb356c797bf; patch: 5.10.259; 61220ab349485d911083d0b7990ccd3db6c63297 <0cdce7618464f7fb06f461e8f4ad575cb1d570f4

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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