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A DMA reentrancy issue leading to a use-after-free error was found in the e1000e NIC emulation code in QEMU. This issue could allow a privileged guest user to crash the QEMU process on the host, resulting in a denial of service.

CVE-2023-3019 is a use-after-free vulnerability identified in the e1000e NIC emulation code of QEMU running on Red Hat Enterprise Linux 8. The root cause is a Direct Memory Access (DMA) reentrancy issue, where the emulated network device mishandles memory references during concurrent DMA operations, leading to a use-after-free condition. This flaw can be triggered by a privileged user inside a guest virtual machine, who can exploit the vulnerability to crash the QEMU process on the host system. The crash results in a denial of service (DoS) condition, impacting the availability of the virtualized environment. The vulnerability requires the attacker to have high privileges within the guest VM, meaning it cannot be exploited remotely or by unprivileged users. There is no impact on confidentiality or integrity, as the flaw does not allow code execution or data leakage. The vulnerability has a CVSS v3.1 base score of 6.0, reflecting medium severity due to the requirement of privileged guest access and the limited impact scope. No public exploits or active exploitation have been reported to date. The issue is specific to Red Hat Enterprise Linux 8 environments running QEMU with the e1000e NIC emulation enabled, which is common in enterprise virtualization setups. Mitigation involves applying vendor patches once available and restricting privileged access within guest VMs to trusted users only.

Detailed information about CVE-2023-3019: Use After Free in Red Hat Red Hat Enterprise Linux 8 affecting Red Hat Red Hat Enterprise Linux 8. Get real-time updat

CVE-2023-3019: Use After Free in Red Hat Red Hat Enterprise Linux 8 - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2023-3019: Use After Free in Red Hat Red Hat Enterprise Linux 8

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