Vulnerability in Linux Kernel's Vhost Subsystem (CVE-2026-74580)
Article Content
- •CVE-2026-74580 affects the Linux kernel's vhost subsystem.
- •Local attackers can exploit this flaw to access out-of-bounds memory.
- •A patch was released on August 21, 2026, but the vulnerability remains critical.
A flaw (CVE-2026-74580) has been identified in the Linux kernel's vhost subsystem, allowing local attackers to exploit the vulnerability by reconfiguring a virtual ring while a device Input/Output Memory Management Unit (IOTLB) is attached. This improper handling can lead to out-of-bounds memory access, resulting in information disclosure, data corruption, or denial of service. The vulnerability has a CVSS score of 8.8, indicating high severity. Users are advised to prevent the vhost kernel module from loading on systems where kernel-accelerated virtio is not required. A patch was released on August 21, 2026, but the exploit remains a concern due to its potential impact on virtual machine instances. The issue is exacerbated by the lack of range checks in the vhost_vq_meta_fetch() function, which could be exploited by malicious actors.
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