CVE-2023-34319: Linux: buffer overrun in netback due to unusual packet
Last updated 25 April 2025
Other sources
The fix for XSA-423 added logic to Linux'es netback driver to deal with a frontend splitting a packet in a way such that not all of the headers would come in one piece. Unfortunately the logic introduced there didn't account for the extreme case of the entire packet being split into as many pieces as permitted by the protocol, yet still being smaller than the area that's specially dealt with to keep all (possible) headers together. Such an unusual packet would therefore trigger a buffer overrun in the driver.
Affected Software
Remediation
Patch Available
Patch Available
Event History
Frequently Asked Questions
What is the severity of CVE-2023-34319?
CVE-2023-34319 has been classified with a critical severity due to its potential impact on vulnerable systems.
How do I fix CVE-2023-34319?
To fix CVE-2023-34319, update your Linux kernel to the latest version or install any available security patches from your distribution.
Which systems are affected by CVE-2023-34319?
CVE-2023-34319 affects multiple versions of the Linux kernel, Debian Linux 10.0, and various Xen hypervisor versions.
What is the nature of the vulnerability in CVE-2023-34319?
CVE-2023-34319 involves a logic flaw in the netback driver of Xen, which can allow potential packet manipulation.
Is there a known exploit for CVE-2023-34319?
As of now, there are no known public exploits for CVE-2023-34319, but it is recommended to apply patches due to its critical nature.