CVE-2022-48711
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk40th percentile - higher than 40% of all known CVEs
Summary
In the Linux kernel, the TIPC subsystem has an issue with size validation for received domain records. The tipc_mon_rcv() function does not verify that the number of members in a record does not exceed the MAX_MON_DOMAIN limit, which may lead to stack overflow. Additionally, an extra sanity check was added in tipc_link_proto_rcv() to prevent bit overflow.
Risk Assessment
The vulnerability may lead to stack overflow and system crashes, potentially enabling DoS attacks in networks using TIPC.
Recommendation
Apply the Linux kernel update containing the fix for CVE-2022-48711. Update systems with TIPC enabled.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: tipc: improve size validations for received domain records The function tipc_mon_rcv() allows a node to receive and process domain_record structs from peer nodes to track their views of the network topology. This patch verifies that the number of members in a received domain record does not exceed the limit defined by MAX_MON_DOMAIN, something that may otherwise lead to a stack overflow. tipc_mon_rcv() is called from the function tipc_link_proto_rcv(), where we are reading a 32 bit message data length field into a uint16. To avert any risk of bit overflow, we add an extra sanity check for this in that function. We cannot see that happen with the current code, but future designers being unaware of this risk, may introduce it by allowing delivery of very large (> 64k) sk buffers from the bearer layer. This potential problem was identified by Eric Dumazet. This fixes CVE-2022-0435