CVE-2025-21950 Information

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 crn_hypercall2\ (arch/x86/include/asm/acrn.h). There is a risk of information leakage due to uninitialized bytes.

Reference

https://git.kernel.org/stable/c/1b8f7a2caa7f9cdfd135e3f78eb9d7e36fb95083 https://git.kernel.org/stable/c/4e15cf870d2c748e45d45ffc4d5b1dc1b7d50120 https://git.kernel.org/stable/c/524f29d78c9bdeb49f31f5b0376a07d2fc5cf563 https://git.kernel.org/stable/c/819cec1dc47cdeac8f5dd6ba81c1dbee2a68c3bb https://git.kernel.org/stable/c/a4c21b878f0e237f45209a324c903ea7fb05247d https://git.kernel.org/stable/c/d7e5031fe3f161c8eb5e84db1540bc4373ed861b