CVE-2021-46911: 
Linux Kernel vulnerability analysis and mitigation

A flaw was found in ch_ktls in the Linux Kernel (CVE-2021-46911). This vulnerability occurs due to a missing synchronization lock in the kernel's TLS implementation, which may cause a denial of service while doing page cleanup (Red Hat Portal).

The vulnerability is caused by improper synchronization in the ch_ktls component of the Linux Kernel. The issue specifically relates to page cleanup operations where a missing lock can lead to kernel panic. The CVSS v3 base score is 4.4, with attack vector being Local, attack complexity Low, and privileges required High. The vulnerability primarily affects availability with no impact on confidentiality or integrity (Red Hat Portal).

The primary impact of this vulnerability is a potential denial of service condition in the Linux kernel. When exploited, it can cause a kernel panic during page cleanup operations, affecting system availability (Red Hat Portal).

The issue has been fixed in the Linux kernel through a patch that improves synchronization by taking the tx_ctx lock for the complete skb transmit, preventing page cleanup if ACK is received in the middle. The fix involves modifying the ch_ktls component to properly handle synchronization during TLS operations (Kernel Commit).