CVE-2024-26928: 
Linux Kernel vulnerability analysis and mitigation

CVE-2024-26928 is a vulnerability discovered in the Linux kernel's SMB client implementation. The issue specifically affects the cifs_debug_files_proc_show() function, where a potential Use-After-Free (UAF) condition exists when handling SMB sessions that are being torn down (NVD). The vulnerability was disclosed on April 28, 2024, and affects multiple versions of the Linux kernel up to versions 6.1.85, 6.6.26, and 6.8.5.

The vulnerability is classified as a Use-After-Free (CWE-416) issue with a CVSS v3.1 base score of 7.8 (HIGH), with the vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. The technical issue occurs in the SMB client's debug functionality when accessing sessions that are in the process of being terminated (status == SES_EXITING). The fix involves adding a check to skip sessions that are being torn down to prevent accessing potentially freed memory (Kernel Patch).

The vulnerability could allow a privileged local attacker to potentially achieve high levels of confidentiality, integrity, and availability impacts on the affected system. Given the CVSS score of 7.8, this represents a significant security risk for systems running affected versions of the Linux kernel (NVD).

The vulnerability requires local access and low privileges to exploit. The attack complexity is rated as low, indicating that the vulnerability is relatively straightforward to exploit under the right conditions. No user interaction is required for exploitation (NVD).

The vulnerability has been patched in various Linux kernel versions. Fixed versions include Linux kernel 6.1.85 and later, 6.6.26 and later, and 6.8.5 and later. Major distributions have released updates to address this vulnerability, including Ubuntu 24.04 LTS and Debian Bookworm (Ubuntu Security, Debian Tracker).