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CVE-2025-21818
Xen Linux XenPVH Guest Register Clobber Vulnerability
Description

Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.

INFO

Published Date :

Feb. 27, 2025, 8:16 p.m.

Last Modified :

March 2, 2025, 3:15 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products

The following products are affected by CVE-2025-21818 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Solution
N/A
  • N/A

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-21818 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2025-21818 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Rejected by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Mar. 02, 2025

    Action Type Old Value New Value
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Mar. 02, 2025

    Action Type Old Value New Value
    Changed 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. Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.
    Removed Reference kernel.org: https://git.kernel.org/stable/c/23f6f420cd727d641f95478fcf3bbbee41e4e5d6
    Removed Reference kernel.org: https://git.kernel.org/stable/c/242f7584da3ad041a9db809d33d27a8be8eccc29
    Removed Reference kernel.org: https://git.kernel.org/stable/c/4890a0858c09d96f3234a8f94663de80a7201bc4
    Removed Reference kernel.org: https://git.kernel.org/stable/c/522d726824cc570e0b6bf0b3af4d5a826f1b17c5
    Removed Reference kernel.org: https://git.kernel.org/stable/c/98a5cfd2320966f40fe049a9855f8787f0126825
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Feb. 27, 2025

    Action Type Old Value New Value
    Added 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.
    Added Reference https://git.kernel.org/stable/c/23f6f420cd727d641f95478fcf3bbbee41e4e5d6
    Added Reference https://git.kernel.org/stable/c/242f7584da3ad041a9db809d33d27a8be8eccc29
    Added Reference https://git.kernel.org/stable/c/4890a0858c09d96f3234a8f94663de80a7201bc4
    Added Reference https://git.kernel.org/stable/c/522d726824cc570e0b6bf0b3af4d5a826f1b17c5
    Added Reference https://git.kernel.org/stable/c/98a5cfd2320966f40fe049a9855f8787f0126825
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
No CVSS metrics available for this vulnerability.