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A NULL pointer dereference flaw was found in vmxnet3_rq_cleanup in drivers/net/vmxnet3/vmxnet3_drv.c in the networking sub-component in vmxnet3 in the Linux Kernel. This issue may allow a local attacker with normal user privilege to cause a denial of service due to a missing sanity check during cleanup.

CVE-2023-4459 is a vulnerability identified in the vmxnet3 network driver within Red Hat Enterprise Linux 8.2 Advanced Update Support. The issue is a NULL pointer dereference in the vmxnet3_rq_cleanup function located in drivers/net/vmxnet3/vmxnet3_drv.c. This flaw occurs because the driver lacks a proper sanity check during the cleanup phase of network receive queue operations. When triggered by a local attacker with standard user privileges, this can cause the kernel to dereference a NULL pointer, leading to a denial of service (DoS) by crashing or halting the affected system. The vulnerability requires local access but no elevated privileges beyond normal user rights and does not require user interaction. The impact is limited to availability, with no direct confidentiality or integrity compromise. The vmxnet3 driver is commonly used in virtualized environments, particularly with VMware virtual machines, making this vulnerability relevant for organizations running Red Hat Enterprise Linux 8.2 in such contexts. Although no known exploits have been reported in the wild, the flaw’s medium CVSS score of 5.5 reflects the moderate risk posed by potential DoS attacks that could disrupt critical services. The vulnerability was published on August 21, 2023, and no patches or exploit codes are currently publicly available, emphasizing the need for vigilance and timely updates once fixes are released.

Detailed information about CVE-2023-4459: NULL Pointer Dereference in Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support affecting Red Hat Red Hat Ent

CVE-2023-4459: NULL Pointer Dereference in Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2023-4459: NULL Pointer Dereference in Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support

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