CVE-2023-53821

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 6.4.0-next-20230707-00001-g84e2cad7f979

Description The Linux kernel contains a flaw within the ipv6 vti module, specifically in the decode session6 function, that can lead to a slab-use-after-free condition. This issue occurs when an ipv6 vti device is configured with a sfb qdisc, potentially modifying the cb field of a sent skb during enqueuing. Subsequently, a slab-use-after-free may occur when the ipv6 vti device transmits IPv6 packets. The root cause is that the cb field in the skb is not properly initialized before packet transmission.

Recommendations Update to version 6.4.0-next-20230707-00001-g84e2cad7f979 or a later version to address this issue.