Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: revalidate bridge ports ebt_redirect_tg() dereferences br_port_get_rcu() return without a NULL check, causing a kernel panic when the bridge port has been removed between the original hook invocation and an NFQUEUE reinject. A mere NULL check isn't sufficient, however. As sashiko review points out userspace can not only remove the port from the bridge, it could also place the device in a different virtual device, e.g. macvlan. If this happens, we must drop the packet, there is no way for us to reinject it into the bridge path. Switch to _upper API, we don't need the bridge port structure. Also, this fix keeps another bug intact: Both nfnetlink_log and nfnetlink_queue use CONFIG_BRIDGE_NETFILTER too aggressive, which prevents certain logging features when queueing in bridge family: NETFILTER_FAMILY_BRIDGE can be enabled while the old CONFIG_BRIDGE_NETFILTER cruft is off. Fixes tag is a common ancestor, this was always broken.
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
f350a0a87374418635689471606454abc7beaa3a to < a1c12915d2502aff00df82f4ccb8c214f956129daffectedf350a0a87374418635689471606454abc7beaa3a to < 98cc0403f546c52104d654fa24d86e9bcac964d3affectedf350a0a87374418635689471606454abc7beaa3a to < 43330a1e8aace6b5a8de9aba127e9e394ab49b0faffectedf350a0a87374418635689471606454abc7beaa3a to < 4beffcd726e2a731cea4dc18e1fbc55c8d76f1a0affectedf350a0a87374418635689471606454abc7beaa3a to < d4b1301fd3c9e5e105fd3767c68bc4ba558bb228affectedf350a0a87374418635689471606454abc7beaa3a to < ccb9fd4b87538ccf19ccff78ee26700526d94867affected
Linux Linux
Default version status: affected
2.6.36affected0 to < 2.6.36unaffected6.1.191 to ≤ 6.1.*unaffected6.6.160 to ≤ 6.6.*unaffected6.12.94 to ≤ 6.12.*unaffected6.18.36 to ≤ 6.18.*unaffected7.0.13 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/a1c12915d2502aff00df82f4ccb8c214f956129d ↗
- https://git.kernel.org/stable/c/98cc0403f546c52104d654fa24d86e9bcac964d3 ↗
- https://git.kernel.org/stable/c/43330a1e8aace6b5a8de9aba127e9e394ab49b0f ↗
- https://git.kernel.org/stable/c/4beffcd726e2a731cea4dc18e1fbc55c8d76f1a0 ↗
- https://git.kernel.org/stable/c/d4b1301fd3c9e5e105fd3767c68bc4ba558bb228 ↗
- https://git.kernel.org/stable/c/ccb9fd4b87538ccf19ccff78ee26700526d94867 ↗