CVE-2022-48865

Summary

In the Linux kernel, the following vulnerability has been resolved:

tipc: fix kernel panic when enabling bearer

When enabling a bearer on a node, a kernel panic is observed:

[ 4.498085] RIP: 0010:tipc_mon_prep+0x4e/0x130 [tipc] … [ 4.520030] Call Trace: [ 4.520689] <IRQ> [ 4.521236] tipc_link_build_proto_msg+0x375/0x750 [tipc] [ 4.522654] tipc_link_build_state_msg+0x48/0xc0 [tipc] [ 4.524034] __tipc_node_link_up+0xd7/0x290 [tipc] [ 4.525292] tipc_rcv+0x5da/0x730 [tipc] [ 4.526346] ? __netif_receive_skb_core+0xb7/0xfc0 [ 4.527601] tipc_l2_rcv_msg+0x5e/0x90 [tipc] [ 4.528737] __netif_receive_skb_list_core+0x20b/0x260 [ 4.530068] netif_receive_skb_list_internal+0x1bf/0x2e0 [ 4.531450] ? dev_gro_receive+0x4c2/0x680 [ 4.532512] napi_complete_done+0x6f/0x180 [ 4.533570] virtnet_poll+0x29c/0x42e [virtio_net] …

The node in question is receiving activate messages in another thread after changing bearer status to allow message sending/ receiving in current thread:

     thread 1           |              thread 2
     --------           |              --------
                        |

tipc_enable_bearer() | test_and_set_bit_lock() | tipc_bearer_xmit_skb() | | tipc_l2_rcv_msg() | tipc_rcv() | __tipc_node_link_up() | tipc_link_build_state_msg() | tipc_link_build_proto_msg() | tipc_mon_prep() | { | … | // null-pointer dereference | u16 gen = mon->dom_gen; | … | } // Not being executed yet | tipc_mon_create() | { | … | // allocate | mon = kzalloc(); | … | } |

Monitoring pointer in thread 2 is dereferenced before monitoring data is allocated in thread 1. This causes kernel panic.

This commit fixes it by allocating the monitoring data before enabling the bearer to receive messages.

Affected Software

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

• https://git.kernel.org/stable/c/2de76d37d4a6dca9b96ea51da24d4290e6cfa1a5
• https://git.kernel.org/stable/c/f96dc3adb9a97b8f3dfdb88796483491a3006b71
• https://git.kernel.org/stable/c/f4f59fdbc748805b08c13dae14c01f0518c77c94
• https://git.kernel.org/stable/c/be4977b847f5d5cedb64d50eaaf2218c3a55a3a3

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://git.kernel.org/stable/c/2de76d37d4a6dca9b96ea51da24d4290e6cfa1a5
• https://git.kernel.org/stable/c/f96dc3adb9a97b8f3dfdb88796483491a3006b71
• https://git.kernel.org/stable/c/f4f59fdbc748805b08c13dae14c01f0518c77c94
• https://git.kernel.org/stable/c/be4977b847f5d5cedb64d50eaaf2218c3a55a3a3

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