CVE-2022-49501
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2022-49501
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-49501.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2022-49501
- Downstream
- Related
- Published
- 2025-02-26T02:13:34Z
- Modified
- 2025-10-15T22:31:42.104146Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- usbnet: Run unregister_netdev() before unbind() again
- Details
-
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, usbnetprobe() first invoked the ->bind() callback and then registernetdev(). usbnetdisconnect() mirrored that by first invoking unregisternetdev() and then ->unbind().
Since the commit, the order in usbnetdisconnect() is reversed and no longer mirrors usbnetprobe().
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().
- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/6d5deb242874d924beccf7eb3cef04c1c3b0da79
- https://git.kernel.org/stable/c/969a1b3ea3cb7d58a16fe12fd1b04bfc0ea40509
- https://git.kernel.org/stable/c/d1408f6b4dd78fb1b9e26bcf64477984e5f85409
- https://git.kernel.org/stable/c/fbda837107f9bd4ec658d2aa88c6856dba606f06
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced2c9d6c2b871d5841ce26ede3e81fd37e2e33c42cFixed6d5deb242874d924beccf7eb3cef04c1c3b0da79
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced2c9d6c2b871d5841ce26ede3e81fd37e2e33c42cFixedfbda837107f9bd4ec658d2aa88c6856dba606f06
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced2c9d6c2b871d5841ce26ede3e81fd37e2e33c42cFixed969a1b3ea3cb7d58a16fe12fd1b04bfc0ea40509
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced2c9d6c2b871d5841ce26ede3e81fd37e2e33c42cFixedd1408f6b4dd78fb1b9e26bcf64477984e5f85409