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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-63917 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/0cdce7618464f7fb06f461e8f4ad575cb1d570f4 kernel.org
https://git.kernel.org/stable/c/11b326fb0a374f4654f9be22d0f0f7abd9f7d3fe kernel.org
https://git.kernel.org/stable/c/225b467e3b631f38be22e4b38062a1fed02fdd21 kernel.org
https://git.kernel.org/stable/c/d9c5eecdb3c740e65038651db7c686b10d76d1bc kernel.org
https://git.kernel.org/stable/c/ee1778ba0f5cb53be771f97017d01eb356c797bf kernel.org
https://git.kernel.org/stable/c/f1e89a943ee574d0f2f16246eb3f2d7330fdeb03 kernel.org
https://git.kernel.org/stable/c/f5c68875e25f331e497ddfbe81e2d8163a87f136 kernel.org
https://git.kernel.org/stable/c/fc32be9ac2788524c6b24efd681cce7a6e731a92 kernel.org

Weakness Enumeration

CWE-ID CWE Name Source

Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-63917
NVD Published Date:
07/19/2026
NVD Last Modified:
07/20/2026
Source:
kernel.org