CVE-2022-48985 is a medium-severity vulnerability rated 4.7/10 on the CVSS scale. 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 the napi thread and access the 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. EPSS estimates a 0.23% chance of exploitation in the next 30 days.

## Description

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

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

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.

## Metrics

CVSS 3.1 4.7/10

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability 0.23%

13.5th percentile

Probability of exploitation in the next 30 days. [Learn more](https://www.first.org/epss/)

## Affected Software

| Vendor | Product         | Versions              | Update |
|--------|----------------|-----------------------|--------|
| Linux  | Linux Kernel   | >= 5.15, < 5.15.83   | —      |
| Linux  | Linux Kernel   | >= 5.16, < 6.0.13    | —      |
| Linux  | Linux Kernel   | 6.1                  | Rc1    |

## References

- [Patch 1](https://git.kernel.org/stable/c/18010ff776fa42340efc428b3ea6d19b3e7c7b21)  
- [Patch 2](https://git.kernel.org/stable/c/6740d8572ccd1bca50d8a1ca2bedc333f50ed5f3)  
- [Patch 3](https://git.kernel.org/stable/c/fe50a9bbeb1f042e756c5cfa7708112c944368de)

## Timeline

Published Oct 21, 2024

Last Modified Aug 4, 2026

Status Modified

## Frequently Asked Questions

### What is CVE-2022-48985?

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 the napi thread and access the 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.

### How severe is CVE-2022-48985?

CVE-2022-48985 has a CVSS score of 4.7/10 (MEDIUM severity). The EPSS model estimates a 0.23% probability of exploitation in the next 30 days.

### How do I fix CVE-2022-48985?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also [run a Strix scan](https://app.strix.ai/) to test if your systems are affected.