CVE-2025-21950 drivers: virt: acrn: hsm: Use kzalloc to avoid info leak in pmcmd_ioctl
A local attacker can read uninitialized kernel memory via the ACRN hypervisor service module ioctl, potentially exposing sensitive data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-21950?
CVE-2025-21950 is a high-severity vulnerability in Debian Debian Linux, published on 1 Apr 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
drivers: virt: acrn: hsm: Use kzalloc to avoid info leak in pmcmd_ioctl
In the "pmcmd_ioctl" function, three memory objects allocated by kmalloc are initialized by "hcall_get_cpu_state", which are then copied to user space. The initializer is indeed implemented in "acrn_hypercall2" (arch/x86/include/asm/acrn.h). There is a risk of information leakage due to uninitialized bytes.
Which versions are affected by CVE-2025-21950?
It affects 2 products.
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2025-21950?
Apply the vendor's patch.
Is CVE-2025-21950 being exploited?
There is no known exploitation of CVE-2025-21950 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as BELL-CVE-2025-21950, DEBIAN-CVE-2025-21950, GHSA-m27r-w8g9-3x9h, ROOT-OS-UBUNTU-2404-CVE-2025-21950, UBUNTU-CVE-2025-21950.