CVE - CVE-2025-21818

CVE-ID
CVE-2025-21818	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: x86/xen: fix xen_hypercall_hvm() to not clobber %rbx xen_hypercall_hvm(), which is used when running as a Xen PVH guest at most only once during early boot, is clobbering %rbx. Depending on whether the caller relies on %rbx to be preserved across the call or not, this clobbering might result in an early crash of the system. This can be avoided by using an already saved register instead of %rbx.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/23f6f420cd727d641f95478fcf3bbbee41e4e5d6 URL:https://git.kernel.org/stable/c/23f6f420cd727d641f95478fcf3bbbee41e4e5d6 MISC:https://git.kernel.org/stable/c/242f7584da3ad041a9db809d33d27a8be8eccc29 URL:https://git.kernel.org/stable/c/242f7584da3ad041a9db809d33d27a8be8eccc29 MISC:https://git.kernel.org/stable/c/4890a0858c09d96f3234a8f94663de80a7201bc4 URL:https://git.kernel.org/stable/c/4890a0858c09d96f3234a8f94663de80a7201bc4 MISC:https://git.kernel.org/stable/c/522d726824cc570e0b6bf0b3af4d5a826f1b17c5 URL:https://git.kernel.org/stable/c/522d726824cc570e0b6bf0b3af4d5a826f1b17c5 MISC:https://git.kernel.org/stable/c/98a5cfd2320966f40fe049a9855f8787f0126825 URL:https://git.kernel.org/stable/c/98a5cfd2320966f40fe049a9855f8787f0126825
Assigning CNA
kernel.org
Date Record Created
20241229	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20241229)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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