# CVE-2022-49501: linux: In the Linux kernel, the following vulnerability has been resolved:  usbnet: Run unregister_netdev() before unbind()...

CVE-2022-49501 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49501, released February 26, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-49501
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0027
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 26, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  usbnet: Run unregister_netdev() before unbind() again  Commit 2c9d6c2b871d ("usbnet: run unbind() before unregister_netdev()") sought to fix a use-after-free on disconnect of USB Ethernet adapters.  It turns out that a different fix is necessary to address the issue: https://lore.kernel.org/netdev/18b3541e5372bc9b9fc733d422f4e698c089077c.1650177997.git.lukas@wunner.de/  So the commit was not necessary.  The commit made binding and unbinding of USB Ethernet asymmetrical: Before, usbnet_probe() first invoked the ->bind() callback and then register_netdev().  usbnet_disconnect() mirrored that by first invoking unregister_netdev() and then ->unbind().  Since the commit, the order in usbnet_disconnect() is reversed and no longer mirrors usbnet_probe().  One consequence is that a PHY disconnected (and stopped) in ->unbind() is afterwards stopped once more by unregister_netdev() as it closes the netdev before unregistering.  That necessitates a contortion in ->stop() because the PHY may only be stopped if it hasn't already been disconnected.  Reverting the commit allows making the call to phy_stop() unconditional in ->stop().

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.18.5-1 | [DEBIAN-CVE-2022-49501](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49501.md) | Feb 26, 2025 |
| Linux | linux Debian 13.5 (trixie) | 5.18.5-1 | [DEBIAN-CVE-2022-49501](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49501.md) | Feb 26, 2025 |
| Linux | linux Debian 14 | 5.18.5-1 | [DEBIAN-CVE-2022-49501](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49501.md) | Feb 26, 2025 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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