---
id: CVE-2023-53543
title: 'vdpa: Add max vqp attr to vdpa_nl_policy for nlattr length check'
summary: |-
  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 e…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 447092100c7e71aa20469a270fcee441d807ed58 <
    baed19c108ac8287425b93a44985bbe9a0b1af8d
  - >-
    Linux >= ad69dd0bf26b88ec6ab26f8bbe5cd74fbed7672a <
    ff71709445ac033e6e250d971683110e4781c068
  - >-
    Linux >= ad69dd0bf26b88ec6ab26f8bbe5cd74fbed7672a <
    ea65e8b5e6b1a34deda7564f09c90e9e80db436a
  - >-
    Linux >= ad69dd0bf26b88ec6ab26f8bbe5cd74fbed7672a <
    5d6ba607d6cb5c58a4ddf33381e18c83dbb4098f
  - Linux >= 5.15.198 < 5.15.209
  - Linux 5.16
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-05T20:23:31.778108Z'
published: '2025-10-04'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:31:14.195Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2023-53543'
references:
  - url: 'https://git.kernel.org/stable/c/baed19c108ac8287425b93a44985bbe9a0b1af8d'
  - url: 'https://git.kernel.org/stable/c/ff71709445ac033e6e250d971683110e4781c068'
  - url: 'https://git.kernel.org/stable/c/ea65e8b5e6b1a34deda7564f09c90e9e80db436a'
  - url: 'https://git.kernel.org/stable/c/5d6ba607d6cb5c58a4ddf33381e18c83dbb4098f'
tags:
  - cve.org
epss: 0.00169
epssPercentile: 0.06282
ingestedAt: '2026-11-05T22:38:31.809Z'
---

## Overview

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.

## Affected

- `Linux >= 447092100c7e71aa20469a270fcee441d807ed58 < baed19c108ac8287425b93a44985bbe9a0b1af8d`
- `Linux >= ad69dd0bf26b88ec6ab26f8bbe5cd74fbed7672a < ff71709445ac033e6e250d971683110e4781c068`
- `Linux >= ad69dd0bf26b88ec6ab26f8bbe5cd74fbed7672a < ea65e8b5e6b1a34deda7564f09c90e9e80db436a`
- `Linux >= ad69dd0bf26b88ec6ab26f8bbe5cd74fbed7672a < 5d6ba607d6cb5c58a4ddf33381e18c83dbb4098f`
- `Linux >= 5.15.198 < 5.15.209`
- `Linux 5.16`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.