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A use-after-free vulnerability was found in the cxgb4 driver in the Linux kernel. The bug occurs when the cxgb4 device is detaching due to a possible rearming of the flower_stats_timer from the work queue. This flaw allows a local user to crash the system, causing a denial of service condition.

CVE-2023-4133 is a use-after-free vulnerability identified in the cxgb4 driver within the Linux kernel, specifically affecting Red Hat Enterprise Linux 8. The cxgb4 driver manages Chelsio T4/T5/T6 network adapters, widely used in enterprise environments for high-performance networking. The vulnerability arises during the detachment process of the cxgb4 device, where the flower_stats_timer, a timer used for collecting network statistics, may be rearmed improperly from a work queue after the device has started detaching. This leads to a use-after-free condition, where the timer callback accesses memory that has already been freed. Such memory corruption can cause the kernel to crash, resulting in a denial of service. The flaw requires local access with low privileges (PR:L) and does not require user interaction (UI:N). The CVSS 3.1 score of 5.5 reflects a medium severity, primarily due to the local attack vector and the impact being limited to availability (system crash). There is no impact on confidentiality or integrity. No public exploits or active exploitation have been reported to date. The vulnerability highlights the importance of careful resource management in kernel drivers, especially those handling asynchronous operations like timers and work queues. Red Hat has acknowledged the issue and is expected to release patches to address the flaw. Until patched, systems remain vulnerable to local denial of service attacks that could disrupt critical services running on affected Red Hat Enterprise Linux 8 installations.

Detailed information about CVE-2023-4133: Use After Free in Red Hat Red Hat Enterprise Linux 8 affecting Red Hat Red Hat Enterprise Linux 8. Get real-time updat

CVE-2023-4133: Use After Free in Red Hat Red Hat Enterprise Linux 8 - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2023-4133: Use After Free in Red Hat Red Hat Enterprise Linux 8

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