In the Linux kernel, the following vulnerability has been resolved:
sfc: Don't invoke xdp_do_flush() from netpoll.
Yury reported a crash in the sfc driver originated from netpoll_send_udp(). The netconsole sends a message and then netpoll invokes the driver's NAPI function with a budget of zero. It is dedicated to allow driver to free TX resources, that it may have used while sending the packet.
In the netpoll case the driver invokes xdp_do_flush() unconditionally, leading to crash because bpf_net_context was never assigned.
Invoke xdp_do_flush() only if budget is not zero.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 27, 2026 | Jul 27, 2026 |
| Ubuntu | — | Upgrade linux-image-oem-24.04bUpgrade linux-image-awsUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-6.11.0-1010-lowlatency-64kUpgrade linux-image-oem-24.04Upgrade linux-image-6.11.0-1009-gcpUpgrade linux-image-realtimeUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-oracle-64kUpgrade linux-image-virtualUpgrade linux-image-oem-24.04aUpgrade linux-image-6.11.0-18-generic-64kUpgrade linux-image-gcpUpgrade linux-image-6.11.0-1005-realtimeUpgrade linux-image-oracleUpgrade linux-image-genericUpgrade linux-image-6.11.0-1009-azureUpgrade linux-image-realtime-hwe-24.04Upgrade linux-image-generic-hwe-24.04Upgrade linux-image-lowlatencyUpgrade linux-image-azureUpgrade linux-image-6.11.0-1010-lowlatencyUpgrade linux-image-azure-fdeUpgrade linux-image-6.11.0-1009-azure-fdeUpgrade linux-image-raspiUpgrade linux-image-6.11.0-1008-raspiUpgrade linux-image-6.11.0-1015-oemUpgrade linux-image-6.11.0-1009-awsUpgrade linux-image-generic-64kUpgrade linux-image-6.11.0-1011-oracleUpgrade linux-image-6.11.0-1011-oracle-64kUpgrade linux-image-lowlatency-64kUpgrade linux-image-6.11.0-18-generic | Feb 20, 2025 | Nov 5, 2024 |
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