CVE - CVE-2022-49664

CVE-ID
CVE-2022-49664	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: tipc: move bc link creation back to tipc_node_create Shuang Li reported a NULL pointer dereference crash: [] BUG: kernel NULL pointer dereference, address: 0000000000000068 [] RIP: 0010:tipc_link_is_up+0x5/0x10 [tipc] [] Call Trace: [] <IRQ> [] tipc_bcast_rcv+0xa2/0x190 [tipc] [] tipc_node_bc_rcv+0x8b/0x200 [tipc] [] tipc_rcv+0x3af/0x5b0 [tipc] [] tipc_udp_recv+0xc7/0x1e0 [tipc] It was caused by the 'l' passed into tipc_bcast_rcv() is NULL. When it creates a node in tipc_node_check_dest(), after inserting the new node into hashtable in tipc_node_create(), it creates the bc link. However, there is a gap between this insert and bc link creation, a bc packet may come in and get the node from the hashtable then try to dereference its bc link, which is NULL. This patch is to fix it by moving the bc link creation before inserting into the hashtable. Note that for a preliminary node becoming "real", the bc link creation should also be called before it's rehashed, as we don't create it for preliminary nodes.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/35fcb2ba35b4d9b592b558c3bcc6e0d90e213588 URL:https://git.kernel.org/stable/c/35fcb2ba35b4d9b592b558c3bcc6e0d90e213588 MISC:https://git.kernel.org/stable/c/456bc338871c4a52117dd5ef29cce3745456d248 URL:https://git.kernel.org/stable/c/456bc338871c4a52117dd5ef29cce3745456d248 MISC:https://git.kernel.org/stable/c/cb8092d70a6f5f01ec1490fce4d35efed3ed996c URL:https://git.kernel.org/stable/c/cb8092d70a6f5f01ec1490fce4d35efed3ed996c MISC:https://git.kernel.org/stable/c/e52910e671f58c619e33dac476b11b35e2d3ab6f URL:https://git.kernel.org/stable/c/e52910e671f58c619e33dac476b11b35e2d3ab6f
Assigning CNA
kernel.org
Date Record Created
20250226	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20250226)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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