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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Oct 23, 2024 | Oct 23, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Oct 21, 2024 |
| Ubuntu | — | Upgrade linux-gkeopUpgrade linuxUpgrade linux-awsUpgrade linux-azure-fde-5.15Upgrade linux-lowlatencyUpgrade linux-intel-iotg-5.15Upgrade linux-azure-5.15Upgrade linux-realtimeUpgrade linux-bluefieldUpgrade linux-intel-iot-realtimeUpgrade linux-oracleUpgrade linux-azure-fdeUpgrade linux-hwe-5.15Upgrade linux-gcpUpgrade linux-nvidiaUpgrade linux-raspiUpgrade linux-gkeop-5.15Upgrade linux-oracle-5.15Upgrade linux-gkeUpgrade linux-lowlatency-hwe-5.15Upgrade linux-intel-iotgUpgrade linux-aws-5.15Upgrade linux-azureUpgrade linux-ibmUpgrade linux-gcp-5.15Upgrade linux-kvmUpgrade linux-riscv-5.15 | Nov 19, 2024 | Oct 21, 2024 |
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