CVE-2023-54179: 
Linux Kernel vulnerability analysis and mitigation

CVE-2023-54179 is a buffer overflow vulnerability in the Linux kernel's SCSI QLA2xxx (Fibre Channel) driver, caused by an out-of-bounds array access in string handling code. The array vha->host_str, sized 16 elements, may be accessed at index values 16–19 due to the use of sprintf() instead of snprintf(). It affects Linux kernel versions across multiple stable branches and was publicly disclosed on December 30, 2025. The vulnerability carries a CVSS v3.1 base score of 7.0 (High), requiring local access with low privileges (Red Hat CVE, Feedly).

The root cause is a classic stack/heap buffer overflow (CWE-121/CWE-787) in the qla2xxx SCSI driver within the Linux kernel. The driver's string handling code uses sprintf() to write into the fixed-size buffer vha->host_str (16 bytes), but the write operation can use index values 16–19, writing beyond the allocated buffer boundary. This was identified by the Klocwork static analysis tool. Exploitation requires local access with low privileges and high attack complexity, as an attacker would need to trigger the specific driver code path to cause the out-of-bounds write (Red Hat CVE, Red Hat Bugzilla).

Successful exploitation could allow a local low-privileged attacker to corrupt kernel memory adjacent to the vha->host_str buffer, potentially leading to unauthorized disclosure of sensitive kernel memory contents, violation of data integrity, or a kernel crash resulting in denial of service. In a worst-case scenario, memory corruption could be leveraged for privilege escalation to full system compromise. The impact is rated High across confidentiality, integrity, and availability (Feedly, Red Hat CVE).

There is no known public proof-of-concept exploit and no evidence of in-the-wild exploitation at this time. The EPSS score is approximately 0.032%, reflecting a low probability of near-term exploitation. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. Exploitation requires local access, low privileges, and high attack complexity, which significantly limits the practical attack surface (Feedly).

Patches are available for multiple Linux kernel stable branches. The vulnerability is resolved in the following versions: 4.19.291+, 5.4.253+, 5.10.188+, 5.15.121+, 6.1.40+, 6.4.5+, and 6.5+. Administrators should update affected systems to the appropriate patched kernel version as soon as possible, prioritizing systems that use the QLA2xxx Fibre Channel HBA driver. As an interim measure, restricting local user access and applying the principle of least privilege can reduce exploitation risk (Feedly, Red Hat Bugzilla).