CVE-2023-53302: 
Linux Kernel vulnerability analysis and mitigation

CVE-2023-53302 is a NULL pointer dereference vulnerability in the Linux kernel's iwl4965 Wi-Fi driver, caused by a missing return value check for create_singlethread_workqueue(). It affects the Linux kernel from version 2.6.24 through multiple stable branches, with fixed versions including 4.19.276, 5.4.235, 5.10.173, 5.15.99, 6.1.16, 6.2.3, and 6.3+. The vulnerability was published on September 16, 2025, and carries a CVSS v3.1 base score of 5.5 (Medium) (Red Hat CVE, Feedly).

The root cause is classified as CWE-476 (NULL Pointer Dereference). In the iwl4965 wireless driver, the return value of create_singlethread_workqueue() was not checked after the call; if the function fails and returns NULL (e.g., due to memory pressure), subsequent code that dereferences the returned pointer will trigger a kernel NULL pointer dereference. Exploitation requires local access to a system with the iwl4965 driver loaded, and the attacker must be able to trigger the relevant driver initialization code path. No public proof-of-concept exploit code has been identified (Red Hat CVE).

Successful exploitation of this vulnerability results in a kernel crash (panic), causing a denial of service on the affected system. There is no impact on confidentiality or data integrity — the sole consequence is loss of availability. The scope is limited to the local system running a vulnerable Linux kernel with the iwl4965 Wi-Fi driver active (Red Hat CVE, Feedly).

No public exploit code or in-the-wild exploitation has been reported for CVE-2023-53302. The EPSS score is approximately 0.024% (0.000240), indicating a very low probability of exploitation in the near term. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. Exploitation requires local, low-privilege access to a system with the affected driver loaded (Red Hat CVE, Feedly).

Update the Linux kernel to a patched version: 4.19.276 or later (for the 2.6.24–4.x branch), 5.4.235+ (4.20–5.4 branch), 5.10.173+ (5.5–5.10 branch), 5.15.99+ (5.11–5.15 branch), 6.1.16+ (5.16–6.1 branch), 6.2.3+ (6.2 branch), or 6.3+. As a workaround on systems where the iwl4965 driver is not needed, it can be blacklisted to prevent loading. Patches are available via the upstream Linux stable kernel tree (Red Hat CVE, kernel.org patch).