Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 2d665034f239412927b1e71329f20f001c92da09 before 7bd0f2b162b426b343a114e1b329f0d8d14fdc6e; affected 2d665034f239412927b1e71329f20f001c92da09 before 01b71ff2857d3598337de11e7840a8e3ff21553c; affected 2d665034f239412927b1e71329f20f001c92da09 before 0fcf6731706f73494245a9c0d64f93bebf95bb51; affected 2d665034f239412927b1e71329f20f001c92da09 before eca62bb0569de4d43a4dac06a2092a9d4ca1d702; affected 2d665034f239412927b1e71329f20f001c92da09 before 311fdd26eb4443d43b909cc67a10f3a5fd1b21b2; affected 2d665034f239412927b1e71329f20f001c92da09 before e70cfb40c3a99b232cd42c6a6a10f0d8e039dc82; affected 2d665034f239412927b1e71329f20f001c92da09 before cf7fc624329e76c6394653d12353e1d033adea91; affected 2d665034f239412927b1e71329f20f001c92da09 before 1d324c2f43f70c965f25c58cc3611c779adbe47e; affected c6d72628352c949629af619b77b042e0fb5245e7; affected 4.16.12 before 4.17 |
| Linux / Linux | affected 4.17; unaffected 0 before 4.17; unaffected 5.10.258 through 5.10.*; unaffected 5.15.209 through 5.15.*; unaffected 6.1.175 through 6.1.*; unaffected 6.6.140 through 6.6.*; unaffected 6.12.88 through 6.12.*; unaffected 6.18.30 through 6.18.*; unaffected 7.0.7 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/7bd0f2b162b426b343a114e1b329f0d8d14fdc6e
- https://git.kernel.org/stable/c/01b71ff2857d3598337de11e7840a8e3ff21553c
- https://git.kernel.org/stable/c/0fcf6731706f73494245a9c0d64f93bebf95bb51
- https://git.kernel.org/stable/c/eca62bb0569de4d43a4dac06a2092a9d4ca1d702
- https://git.kernel.org/stable/c/311fdd26eb4443d43b909cc67a10f3a5fd1b21b2
- https://git.kernel.org/stable/c/e70cfb40c3a99b232cd42c6a6a10f0d8e039dc82
- https://git.kernel.org/stable/c/cf7fc624329e76c6394653d12353e1d033adea91
- https://git.kernel.org/stable/c/1d324c2f43f70c965f25c58cc3611c779adbe47e
ADP enrichment
No English description supplied.
No English description supplied.
No references supplied.