Cloud Vulnerability DB
A community-led vulnerabilities database
Vulnerability DatabaseCVE-2025-21950
CVE-2025-21950:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2025-21950 is a vulnerability discovered in the Linux kernel affecting the ACRN hypervisor subsystem. The vulnerability was disclosed on April 1, 2025, and specifically impacts the pmcmd_ioctl function in the drivers/virt/acrn/hsm component (NVD).
Technical details
The vulnerability stems from improper memory initialization in the pmcmd_ioctl function. Three memory objects allocated by kmalloc are initialized by hcall_get_cpu_state and then copied to user space. The initializer is implemented in acrn_hypercall2 (arch/x86/include/asm/acrn.h), but there is a risk of information leakage due to uninitialized bytes (NVD).
Impact
The vulnerability could lead to information disclosure, potentially exposing sensitive kernel memory contents to unauthorized users (NVD).
Mitigation and workarounds
The vulnerability has been addressed in the Linux kernel by modifying the code to use kzalloc instead of kmalloc to ensure proper memory initialization. This fix has been included in various distribution updates, including Debian's version 6.1.133-1 (Debian Security).
Additional resources
Source: This report was generated using AI
Related Linux Kernel vulnerabilities:
Free Vulnerability Assessment
Benchmark your Cloud Security Posture
Evaluate your cloud security practices across 9 security domains to benchmark your risk level and identify gaps in your defenses.
Additional Wiz resources
Get a personalized demo
Ready to see Wiz in action?
"Best User Experience I have ever seen, provides full visibility to cloud workloads."
David EstlickCISO
"Wiz provides a single pane of glass to see what is going on in our cloud environments."
Adam FletcherChief Security Officer
"We know that if Wiz identifies something as critical, it actually is."
Greg PoniatowskiHead of Threat and Vulnerability Management