Description
In the Linux kernel, the following vulnerability has been resolved: net: ip_gre: require CAP_NET_ADMIN in the device netns for changelink A tunnel changelink() operates on at most two netns, dev_net(dev) and the tunnel link netns t->net. They differ once the device is created in or moved to a netns other than the one the request runs in. The rtnl changelink path checks CAP_NET_ADMIN only against dev_net(dev), so a caller privileged there but not in t->net can rewrite a tunnel that lives in t->net. Add rtnl_dev_link_net_capable() next to rtnl_get_net_ns_capable() in net/core/rtnetlink.c. It requires CAP_NET_ADMIN in the link netns and is skipped when the link netns is dev_net(dev), where the rtnl path already checked it. The other patches in this series use the same helper. Gate ipgre_changelink() and erspan_changelink() with it, at the top of the op before any attribute is parsed, because the parsers update live tunnel fields first. ipgre_netlink_parms() sets t->collect_md before ip_tunnel_changelink() runs. Commit 8b484efd5cb4 ("ip6: vti: Use ip6_tnl.net in vti6_siocdevprivate().") added the same check on the ioctl path. This adds it on RTM_NEWLINK.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
b57708add31494175be741ed3fd24023b50c3423 to < 19275943d8fe903eb7b9aa53e380e41efd042adaaffectedb57708add31494175be741ed3fd24023b50c3423 to < 866b0f5ae599490bd496fd84581c68ac8b94e6afaffectedb57708add31494175be741ed3fd24023b50c3423 to < 92b766fc55156e0da2ecd0c2302c971118f8a229affectedb57708add31494175be741ed3fd24023b50c3423 to < e54c05ed3d9c28733fb9e5837219aca3691defa3affectedb57708add31494175be741ed3fd24023b50c3423 to < 9831bc9ecb402957810c2045c663fbfe9b09e296affectedb57708add31494175be741ed3fd24023b50c3423 to < 1697957eb0971d420dde42862b88eb43506a1105affectedb57708add31494175be741ed3fd24023b50c3423 to < 47b5d3d506609b08b2e1f7c14f0b681a1953d572affectedb57708add31494175be741ed3fd24023b50c3423 to < 8165f7ff57d9667d2bb477ef6af83ede7fed4ad7affected
Linux Linux
Default version status: affected
3.16affected0 to < 3.16unaffected5.10.261 to ≤ 5.10.*unaffected5.15.212 to ≤ 5.15.*unaffected6.1.178 to ≤ 6.1.*unaffected6.6.145 to ≤ 6.6.*unaffected6.12.95 to ≤ 6.12.*unaffected6.18.38 to ≤ 6.18.*unaffected7.1.3 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/19275943d8fe903eb7b9aa53e380e41efd042ada ↗
- https://git.kernel.org/stable/c/866b0f5ae599490bd496fd84581c68ac8b94e6af ↗
- https://git.kernel.org/stable/c/92b766fc55156e0da2ecd0c2302c971118f8a229 ↗
- https://git.kernel.org/stable/c/e54c05ed3d9c28733fb9e5837219aca3691defa3 ↗
- https://git.kernel.org/stable/c/9831bc9ecb402957810c2045c663fbfe9b09e296 ↗
- https://git.kernel.org/stable/c/1697957eb0971d420dde42862b88eb43506a1105 ↗
- https://git.kernel.org/stable/c/47b5d3d506609b08b2e1f7c14f0b681a1953d572 ↗
- https://git.kernel.org/stable/c/8165f7ff57d9667d2bb477ef6af83ede7fed4ad7 ↗