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Vulnerability record · CVE-2026-46120 · published 28 May 2026

CVE-2026-46120: Linux kernel use after free vulnerability

Linux · Linux Kernel

In 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.

7.8 CVSS 3.1 High EPSS 0.17% · top 94.2% CWE-416 · Use after free Undergoing Analysis
7.8CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
24 Jun 2026Last modified by NVD

Description

In 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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/01b71ff2857d3598337de11e7840a8e3ff21553c Patch
https://git.kernel.org/stable/c/0fcf6731706f73494245a9c0d64f93bebf95bb51 Patch
https://git.kernel.org/stable/c/1d324c2f43f70c965f25c58cc3611c779adbe47e Patch
https://git.kernel.org/stable/c/311fdd26eb4443d43b909cc67a10f3a5fd1b21b2 Patch
https://git.kernel.org/stable/c/7bd0f2b162b426b343a114e1b329f0d8d14fdc6e Patch
https://git.kernel.org/stable/c/cf7fc624329e76c6394653d12353e1d033adea91 Patch
https://git.kernel.org/stable/c/e70cfb40c3a99b232cd42c6a6a10f0d8e039dc82 Patch
https://git.kernel.org/stable/c/eca62bb0569de4d43a4dac06a2092a9d4ca1d702 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-46120), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.