CVE-2026-46120ip6_gre: Use cached t->net in ip6erspan_changelink().
Updated under an hour ago ()
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It affects Linux and 2 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Undergoing Analysis
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 2d665034f239412927b1e71329f20f001c92da09 before 7bd0f2b162b426b343a114e1b329f0d8d14fdc6e; 2d665034f239412927b1e71329f20f001c92da09 builds before 01b71ff2857d3598337de11e7840a8e3ff21553c; 2d665034f239412927b1e71329f20f001c92da09 builds before 0fcf6731706f73494245a9c0d64f93bebf95bb51; from 2d665034f239412927b1e71329f20f001c92da09 before eca62bb0569de4d43a4dac06a2092a9d4ca1d702; from 2d665034f239412927b1e71329f20f001c92da09 before 311fdd26eb4443d43b909cc67a10f3a5fd1b21b2; from 2d665034f239412927b1e71329f20f001c92da09 before e70cfb40c3a99b232cd42c6a6a10f0d8e039dc82; from 2d665034f239412927b1e71329f20f001c92da09 before cf7fc624329e76c6394653d12353e1d033adea91; 2d665034f239412927b1e71329f20f001c92da09 builds before 1d324c2f43f70c965f25c58cc3611c779adbe47e; and 2 more ranges | CNA record |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
linux linux_kernel linux:linux_kernel | from 4.16.12 before 4.17; from 4.17.1 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.140; from 6.7 before 6.12.88; from 6.13 before 6.18.30; from 6.19 before 7.0.7; and 4 more ranges | NVD |
References
- https://git.kernel.org/stable/c/7bd0f2b162b426b343a114e1b329f0d8d14fdc6epatch
- https://git.kernel.org/stable/c/01b71ff2857d3598337de11e7840a8e3ff21553cpatch
- https://git.kernel.org/stable/c/0fcf6731706f73494245a9c0d64f93bebf95bb51patch
- https://git.kernel.org/stable/c/eca62bb0569de4d43a4dac06a2092a9d4ca1d702patch
- https://git.kernel.org/stable/c/311fdd26eb4443d43b909cc67a10f3a5fd1b21b2patch
- https://git.kernel.org/stable/c/e70cfb40c3a99b232cd42c6a6a10f0d8e039dc82patch
- https://git.kernel.org/stable/c/cf7fc624329e76c6394653d12353e1d033adea91patch
- https://git.kernel.org/stable/c/1d324c2f43f70c965f25c58cc3611c779adbe47epatch
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.