Underflow Vulnerability in RDMA/nldev

Kernel Updated 02 Oct 2025

Summary

24/04/2022

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2022-1001512: RDMA/nldev: Prevent underflow in nldev_stat_set_counter_dynamic_doit(). Affects Kernel versions >= 3c3c1f1416392382faa0238e76a70d7810aab2ef, < f6dd8669b8299a3a536cd92a7069152a7704da1d. No fix is published. How to fix ↓

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Background

RDMA/nldev is a component of the Linux Kernel that provides a netlink interface for managing RDMA devices. RDMA (Remote Direct Memory Access) allows for high-performance data transfers between remote systems. The nldev module specifically handles statistics counters for RDMA devices. This vulnerability affects the nldev_stat_set_counter_dynamic_doit() function within RDMA/nldev.

Vulnerability Detail

The nldev_stat_set_counter_dynamic_doit() function in RDMA/nldev is vulnerable to an underflow issue. This vulnerability was introduced in version v5.16 of the Linux Kernel and fixed in version v5.16.19. An attacker could exploit this vulnerability to cause an underflow, potentially leading to memory corruption or other security issues. The impact and attack plausibility of this vulnerability have not been proven.

How To Fix

No fixed version is published for this vulnerability.

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Workaround

No workaround has been provided for this vulnerability.

Conclusion

In conclusion, the RDMA/nldev component of the Linux Kernel is vulnerable to an underflow issue in the nldev_stat_set_counter_dynamic_doit() function. It is recommended to update the Linux Kernel to version v5.16.19 or later to fix this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.

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