Description
In the Linux kernel, the following vulnerability has been resolved: tipc: fix UAF in tipc_l2_send_msg() Syzbot reported a slab-use-after-free in ipvlan_hard_header() when called from tipc_l2_send_msg(). The root cause is that tipc_disable_l2_media() calls synchronize_net() while b->media_ptr is still valid. This allows concurrent RCU readers to obtain the device pointer after synchronize_net() has finished. The pointer is cleared later in bearer_disable(), but without any subsequent synchronization, allowing the device to be freed while still in use by readers. Fix this by clearing b->media_ptr in tipc_disable_l2_media() before calling synchronize_net(). This is safe to do now because the call order in bearer_disable() was reversed in 0d051bf93c06 ("tipc: make bearer packet filtering generic") to call tipc_node_delete_links() (which needs the pointer) before disable_media(). https: //lore.kernel.org/netdev/6a2c1007.428ffe26.258b27.015d.GAE@google.com/T/#u
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
282b3a056225b35024246f63feb91d769d714dad to < 609ced2301be1df7e7ed2ef47d1d916674e6ba3baffected282b3a056225b35024246f63feb91d769d714dad to < 71aafa16d79b107b33837f60b6cbc7d0cb8c5708affected282b3a056225b35024246f63feb91d769d714dad to < f4002f1c669cc02e3763f479fc25ff1dfa9e2420affected282b3a056225b35024246f63feb91d769d714dad to < 50ff092633b06382e5091dd5b093ce943d4ac2f9affected282b3a056225b35024246f63feb91d769d714dad to < aef12b5ce793dea6b3a97a58fd0f946000ae8945affected282b3a056225b35024246f63feb91d769d714dad to < 0d8a12d7143126afdf9fbe2e3d438650dd6603edaffected282b3a056225b35024246f63feb91d769d714dad to < 35e0297a93c3c34a3924eeef816c03504e3ab5c5affected282b3a056225b35024246f63feb91d769d714dad to < f4c3d89fc986b0da196ddfc6cfe0ea5d5d08bec6affected
Linux Linux
Default version status: affected
4.4affected0 to < 4.4unaffected5.10.261 to ≤ 5.10.*unaffected5.15.212 to ≤ 5.15.*unaffected6.1.178 to ≤ 6.1.*unaffected6.6.145 to ≤ 6.6.*unaffected6.12.97 to ≤ 6.12.*unaffected6.18.40 to ≤ 6.18.*unaffected7.1.5 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/609ced2301be1df7e7ed2ef47d1d916674e6ba3b ↗
- https://git.kernel.org/stable/c/71aafa16d79b107b33837f60b6cbc7d0cb8c5708 ↗
- https://git.kernel.org/stable/c/f4002f1c669cc02e3763f479fc25ff1dfa9e2420 ↗
- https://git.kernel.org/stable/c/50ff092633b06382e5091dd5b093ce943d4ac2f9 ↗
- https://git.kernel.org/stable/c/aef12b5ce793dea6b3a97a58fd0f946000ae8945 ↗
- https://git.kernel.org/stable/c/0d8a12d7143126afdf9fbe2e3d438650dd6603ed ↗
- https://git.kernel.org/stable/c/35e0297a93c3c34a3924eeef816c03504e3ab5c5 ↗
- https://git.kernel.org/stable/c/f4c3d89fc986b0da196ddfc6cfe0ea5d5d08bec6 ↗