CVE-2024-26820: hv_netvsc: Register VF in netvsc_probe if NET_DEVICE_REGISTER missed

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-04-17 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: hv_netvsc: Register VF in netvsc_probe if NET_DEVICE_REGISTER missed If hv_netvsc driver is unloaded and reloaded, the NET_DEVICE_REGISTER handler cannot perform VF register successfully as the register call is received before netvsc_probe is finished. This is because we register register_netdevice_notifier() very early( even before vmbus_driver_register()). To fix this, we try to register each such matching VF( if it is visible as a netdevice) at the end of netvsc_probe.

Affected products

Debian Linux: 10.0
Linux kernel: from 4.19.301 before 4.19.310; from 5.4.263 before 5.4.272; from 5.10.203 before 5.10.213; from 5.15.141 before 5.15.152; from 6.1.65 before 6.1.79; from 6.6.4 before 6.6.18 — fixed in 4.19.310, 5.10.213, 5.15.152, 5.4.272, 6.1.79, 6.6.18

How to fix

Upgrade to a fixed version: Linux kernel 4.19.310, 5.10.213, 5.15.152, 5.4.272. Check the vendor advisory for mitigations.

References

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