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

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Summary

CVECVE-2026-63917
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:09 UTC
Updated2026-07-20 15:16:55 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS: 0.002100000 probability, percentile 0.113610000 (date 2026-07-20)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 61220ab349485d911083d0b7990ccd3db6c63297 0cdce7618464f7fb06f461e8f4ad575cb1d570f4 git Not specified
CNA Linux Linux affected 61220ab349485d911083d0b7990ccd3db6c63297 f5c68875e25f331e497ddfbe81e2d8163a87f136 git Not specified
CNA Linux Linux affected 61220ab349485d911083d0b7990ccd3db6c63297 d9c5eecdb3c740e65038651db7c686b10d76d1bc git Not specified
CNA Linux Linux affected 61220ab349485d911083d0b7990ccd3db6c63297 f1e89a943ee574d0f2f16246eb3f2d7330fdeb03 git Not specified
CNA Linux Linux affected 61220ab349485d911083d0b7990ccd3db6c63297 225b467e3b631f38be22e4b38062a1fed02fdd21 git Not specified
CNA Linux Linux affected 61220ab349485d911083d0b7990ccd3db6c63297 fc32be9ac2788524c6b24efd681cce7a6e731a92 git Not specified
CNA Linux Linux affected 61220ab349485d911083d0b7990ccd3db6c63297 ee1778ba0f5cb53be771f97017d01eb356c797bf git Not specified
CNA Linux Linux affected 61220ab349485d911083d0b7990ccd3db6c63297 11b326fb0a374f4654f9be22d0f0f7abd9f7d3fe git Not specified
CNA Linux Linux affected 3.15 Not specified
CNA Linux Linux unaffected 3.15 semver Not specified
CNA Linux Linux unaffected 5.10.259 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.93 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.35 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.12 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/fc32be9ac2788524c6b24efd681cce7a6e731a92 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/225b467e3b631f38be22e4b38062a1fed02fdd21 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d9c5eecdb3c740e65038651db7c686b10d76d1bc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ee1778ba0f5cb53be771f97017d01eb356c797bf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f5c68875e25f331e497ddfbe81e2d8163a87f136 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0cdce7618464f7fb06f461e8f4ad575cb1d570f4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f1e89a943ee574d0f2f16246eb3f2d7330fdeb03 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/11b326fb0a374f4654f9be22d0f0f7abd9f7d3fe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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