{"uuid": "a8e6fbe8-4861-4ce6-af48-d7821c627170", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "2a075640-a300-48a4-bb44-bc6130783b9b", "vulnerability": "CVE-2025-21818", "type": "published-proof-of-concept", "source": "https://t.me/DarkWebInformer_CVEAlerts/5790", "content": "\ud83d\udd17 DarkWebInformer.com - Cyber Threat Intelligence\n\ud83d\udccc CVE ID: CVE-2025-21818\n\ud83d\udd25 CVSS Score: N/A\n\ud83d\udd39 Description: In the Linux kernel, the following vulnerability has been resolved:\n\nx86/xen: fix xen_hypercall_hvm() to not clobber %rbx\n\nxen_hypercall_hvm(), which is used when running as a Xen PVH guest at\nmost only once during early boot, is clobbering %rbx. Depending on\nwhether the caller relies on %rbx to be preserved across the call or\nnot, this clobbering might result in an early crash of the system.\n\nThis can be avoided by using an already saved register instead of %rbx.\n\ud83d\udccf Published: 2025-02-27T20:04:16.619Z\n\ud83d\udccf Modified: 2025-02-27T20:04:16.619Z\n\ud83d\udd17 References:\n1. https://git.kernel.org/stable/c/522d726824cc570e0b6bf0b3af4d5a826f1b17c5\n2. https://git.kernel.org/stable/c/242f7584da3ad041a9db809d33d27a8be8eccc29\n3. https://git.kernel.org/stable/c/4890a0858c09d96f3234a8f94663de80a7201bc4\n4. https://git.kernel.org/stable/c/23f6f420cd727d641f95478fcf3bbbee41e4e5d6\n5. https://git.kernel.org/stable/c/98a5cfd2320966f40fe049a9855f8787f0126825", "creation_timestamp": "2025-02-27T20:25:55.000000Z"}