CVE-2022-48985

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

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.

4.7

CVSS

Severity: Medium

CVSS 3.1 •

EPSS 0.03%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/fe50a9bbeb1f042e756c5cfa7708112c944368de	patch
https://git.kernel.org/stable/c/6740d8572ccd1bca50d8a1ca2bedc333f50ed5f3	patch
https://git.kernel.org/stable/c/18010ff776fa42340efc428b3ea6d19b3e7c7b21	patch

Frequently Asked Questions

What is the severity of CVE-2022-48985?: CVE-2022-48985 has been scored as a medium severity vulnerability.
How to fix CVE-2022-48985?: To fix CVE-2022-48985, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-48985 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2022-48985 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-48985?: CVE-2022-48985 affects Linux Linux, Linux Linux.

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