A remote denial of service vulnerability was found in the Linux kernel’s TIPC kernel module. The while loop in tipc_link_xmit() hits an unknown state while attempting to parse SKBs, which are not in the queue. Sending two small UDP packets to a system with a UDP bearer results in the CPU utilization for the system to instantly spike to 100%, causing a denial of service condition.

References

• https://nvd.nist.gov/vuln/detail/CVE-2023-1390
• torvalds/linux@b774134
• https://gist.github.com/netspooky/bee2d07022f6350bb88eaa48e571d9b5
• https://infosec.exchange/@_mattata/109427999461122360
• https://infosec.exchange/%40_mattata/109427999461122360
• https://security.netapp.com/advisory/ntap-20230420-0001