CVE-2022-48985: net: mana: Fix race on per-CQ variable napi work_done
In the Linux kernel, the following vulnerability has been resolved:
net: mana: Fix race on per-CQ variable napi workdone
After calling napicompletedone(), the NAPIFSTATESCHED bit may be cleared, and another CPU can start napi thread and access per-CQ variable, cq->workdone. If the other thread (for example, from busypoll) 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 workdone variable in a local variable before napicompletedone(), so it won't be corrupted by a possible concurrent thread after napicompletedone().
Also, add a flag bit to advertise to the NIC firmware: the NAPI workdone variable race is fixed, so the driver is able to reliably support features like busypoll.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/linuxto a version that resolves this vulnerability.Fixed in 6.1.4-1 - Upgrade
Upgrade
debian/linuxto a version that resolves this vulnerability.Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.115-2Fixed in 7.2.12-1Fixed in 7.2.15-1
Event History
Frequently Asked Questions
What is the severity of CVE-2022-48985?
CVE-2022-48985 has been classified with a severity level that can impact system stability due to its race condition in the Linux kernel.
How do I fix CVE-2022-48985?
To fix CVE-2022-48985, users should update their Linux kernel to a version that includes the patches addressing this vulnerability.
Which versions of the Linux kernel are affected by CVE-2022-48985?
CVE-2022-48985 affects Linux kernel versions from 5.15 through 6.1-rc8.
What is the nature of the issue in CVE-2022-48985?
CVE-2022-48985 involves a race condition that can lead to the improper handling of per-CQ variable 'work_done' during NAPI operations.
Are there any exploitations known for CVE-2022-48985?
As of now, there are no publicly known exploitations of CVE-2022-48985, but the potential for race condition vulnerability poses a risk.