CVE-2022-49199: RDMA/nldev: Prevent underflow in nldev_stat_set_counter_dynamic_doit()

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-02-26 · updated 2026-06-17
Weakness: CWE-191

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/nldev: Prevent underflow in nldev_stat_set_counter_dynamic_doit() This code checks "index" for an upper bound but it does not check for negatives. Change the type to unsigned to prevent underflows.

Affected products

Linux kernel: from 5.16 before 5.16.19; from 5.17 before 5.17.2 — fixed in 5.16.19, 5.17.2

How to fix

Upgrade to a fixed version: Linux kernel 5.16.19, 5.17.2. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/2a495ef04d5f42e6f00eb2bec1ee9075e3d5a771
https://git.kernel.org/stable/c/87e0eacb176f9500c2063d140c0a1d7fa51ab8a5
https://git.kernel.org/stable/c/f6dd8669b8299a3a536cd92a7069152a7704da1d

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