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CVE-2022-48985

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: net: mana: Fix race on per-CQ variable napi work_done After calling napi_complete_done(), the NAPIF_STATE_SCHED bit may be clea…

Published Oct 21, 2024EPSS 0.59%

Overview

CVE-2022-48985 is a critical-severity vulnerability. It was published on October 21, 2024 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

net: mana: Fix race on per-CQ variable napi work_done

After calling napi_complete_done(), the NAPIF_STATE_SCHED bit may be

cleared, and another CPU can start napi thread and access per-CQ variable,

cq->work_done. If the other thread (for example, from busy_poll) sets

it to a value >= budget, this thread will continue to run when it should

stop, and cause memory corruption and panic.

To fix this issue, save the per-CQ work_done variable in a local variable

before napi_complete_done(), so it won't be corrupted by a possible

concurrent thread after napi_complete_done().

Also, add a flag bit to advertise to the NIC firmware: the NAPI work_done

variable race is fixed, so the driver is able to reliably support features

like busy_poll.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/18010ff776fa42340efc428b3ea6d19b3e7c7b21Refgit.kernel.org/stable/c/6740d8572ccd1bca50d8a1ca2bedc333f50ed5f3Refgit.kernel.org/stable/c/fe50a9bbeb1f042e756c5cfa7708112c944368de

How CyberStrike helps

Frequently asked questions

What is CVE-2022-48985?

CVE-2022-48985 is a critical-severity vulnerability. It was published on October 21, 2024 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2022-48985?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2022-48985?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2022-48985?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-48985 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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