CVE-2022-48985

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.

Reserved 2024-08-22 | Published 2024-10-21 | Updated 2024-12-19 | Assigner Linux

Product status

Default status
unaffected

e1b5683ff62e7b328317aec08869495992053e9d before fe50a9bbeb1f042e756c5cfa7708112c944368de
affected

e1b5683ff62e7b328317aec08869495992053e9d before 6740d8572ccd1bca50d8a1ca2bedc333f50ed5f3
affected

e1b5683ff62e7b328317aec08869495992053e9d before 18010ff776fa42340efc428b3ea6d19b3e7c7b21
affected

Default status
affected

5.15
affected

Any version before 5.15
unaffected

5.15.83
unaffected

6.0.13
unaffected

6.1
unaffected

References

git.kernel.org/...c/fe50a9bbeb1f042e756c5cfa7708112c944368de

git.kernel.org/...c/6740d8572ccd1bca50d8a1ca2bedc333f50ed5f3

git.kernel.org/...c/18010ff776fa42340efc428b3ea6d19b3e7c7b21

cve.org (CVE-2022-48985)

nvd.nist.gov (CVE-2022-48985)

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