ip6_gre: Use cached t->net in ip6erspan_changelink().

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Summary

CVECVE-2026-46120
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-28 10:16:27 UTC
Updated2026-06-01 17:17:25 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ip6_gre: Use cached t->net in ip6erspan_changelink(). After commit 5e72ce3e3980 ("net: ipv6: Use link netns in newlink() of rtnl_link_ops"), ip6erspan_newlink() correctly resolves the per-netns ip6gre hash via link_net. ip6erspan_changelink() was not converted in that series and still uses dev_net(dev), which diverges from the device's creation netns after IFLA_NET_NS_FD migration. This re-inserts the tunnel into the wrong per-netns hash. The original netns keeps a stale entry. When that netns is later destroyed, ip6gre_exit_rtnl_net() walks the stale entry, producing a slab-use-after-free reported by KASAN, followed by a kernel BUG at net/core/dev.c (LIST_POISON1) in unregister_netdevice_many_notify(). Reachable from an unprivileged user namespace (unshare --user --map-root-user --net). ip6gre_changelink() earlier in the same file already uses the cached t->net; only ip6erspan_changelink() has the wrong shape.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.000130000 probability, percentile 0.024910000 (date 2026-06-04)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2d665034f239412927b1e71329f20f001c92da09 7bd0f2b162b426b343a114e1b329f0d8d14fdc6e git Not specified
CNA Linux Linux affected 2d665034f239412927b1e71329f20f001c92da09 01b71ff2857d3598337de11e7840a8e3ff21553c git Not specified
CNA Linux Linux affected 2d665034f239412927b1e71329f20f001c92da09 0fcf6731706f73494245a9c0d64f93bebf95bb51 git Not specified
CNA Linux Linux affected 2d665034f239412927b1e71329f20f001c92da09 eca62bb0569de4d43a4dac06a2092a9d4ca1d702 git Not specified
CNA Linux Linux affected 2d665034f239412927b1e71329f20f001c92da09 311fdd26eb4443d43b909cc67a10f3a5fd1b21b2 git Not specified
CNA Linux Linux affected 2d665034f239412927b1e71329f20f001c92da09 e70cfb40c3a99b232cd42c6a6a10f0d8e039dc82 git Not specified
CNA Linux Linux affected 2d665034f239412927b1e71329f20f001c92da09 cf7fc624329e76c6394653d12353e1d033adea91 git Not specified
CNA Linux Linux affected 2d665034f239412927b1e71329f20f001c92da09 1d324c2f43f70c965f25c58cc3611c779adbe47e git Not specified
CNA Linux Linux affected c6d72628352c949629af619b77b042e0fb5245e7 git Not specified
CNA Linux Linux affected 4.16.12 4.17 semver Not specified
CNA Linux Linux affected 4.17 Not specified
CNA Linux Linux unaffected 4.17 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.140 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.88 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.30 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.7 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0fcf6731706f73494245a9c0d64f93bebf95bb51 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/311fdd26eb4443d43b909cc67a10f3a5fd1b21b2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7bd0f2b162b426b343a114e1b329f0d8d14fdc6e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eca62bb0569de4d43a4dac06a2092a9d4ca1d702 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e70cfb40c3a99b232cd42c6a6a10f0d8e039dc82 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cf7fc624329e76c6394653d12353e1d033adea91 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/01b71ff2857d3598337de11e7840a8e3ff21553c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1d324c2f43f70c965f25c58cc3611c779adbe47e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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