CVE-2023-53543: vdpa: Add max vqp attr to vdpa_nl_policy for nlattr length check

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-10-04 · updated 2026-06-18
Weakness: CWE-787

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.

Affected products

Linux kernel: from 5.15.198 before 5.15.209; from 5.16 before 6.1.47; from 6.2 before 6.4.12; 6.5-rc1, 6.5-rc2, 6.5-rc3, 6.5-rc4, 6.5-rc5, 6.5-rc6 — fixed in 5.15.209, 6.1.47, 6.4.12

How to fix

Upgrade to a fixed version: Linux kernel 5.15.209, 6.1.47, 6.4.12. Check the vendor advisory for mitigations.

References

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