CVE-2022-49058: 
Linux Kernel vulnerability analysis and mitigation

CVE-2022-49058 is a potential buffer overflow vulnerability in the Linux kernel's CIFS (Common Internet File System) implementation, specifically in the handling of symlinks. The vulnerability was discovered in 2022 and affects the kernel's file system component (Kernel Git).

The vulnerability stems from insufficient validation of the 'linklen' parameter in the CIFS symlink handling code. The issue was identified when Smatch tool reported a warning about a potential buffer overflow in '_memcpy()' operation where 'dctx->buf' could be too small (16 vs u32max). The vulnerability occurs because 'link_len' is marked as untrusted since it comes from sscanf() without proper size validation (Red Hat). The vulnerability has been assigned a CVSS v3.1 score of 5.5 with the vector: AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

The vulnerability could lead to a buffer overflow condition in the Linux kernel when handling CIFS symlinks. This could potentially result in system crashes or denial of service conditions, as indicated by the high availability impact in the CVSS scoring (Red Hat).

The vulnerability has been patched by adding a check to ensure that 'linklen' is not larger than the size of the 'linkstr' buffer. The fix was implemented in the Linux kernel through commit 64c4a37ac04eeb43c42d272f6e6c8c12bfcf4304 (Kernel Git).