fkie_cve-2022-49501
Vulnerability from fkie_nvd
Published
2025-02-26 07:01
Modified
2025-03-24 19:43
Severity ?
Summary
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().
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * |
{
"configurations": [
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusbnet: Run unregister_netdev() before unbind() again\n\nCommit 2c9d6c2b871d (\"usbnet: run unbind() before unregister_netdev()\")\nsought to fix a use-after-free on disconnect of USB Ethernet adapters.\n\nIt turns out that a different fix is necessary to address the issue:\nhttps://lore.kernel.org/netdev/18b3541e5372bc9b9fc733d422f4e698c089077c.1650177997.git.lukas@wunner.de/\n\nSo the commit was not necessary.\n\nThe commit made binding and unbinding of USB Ethernet asymmetrical:\nBefore, usbnet_probe() first invoked the -\u003ebind() callback and then\nregister_netdev(). usbnet_disconnect() mirrored that by first invoking\nunregister_netdev() and then -\u003eunbind().\n\nSince the commit, the order in usbnet_disconnect() is reversed and no\nlonger mirrors usbnet_probe().\n\nOne consequence is that a PHY disconnected (and stopped) in -\u003eunbind()\nis afterwards stopped once more by unregister_netdev() as it closes the\nnetdev before unregistering. That necessitates a contortion in -\u003estop()\nbecause the PHY may only be stopped if it hasn\u0027t already been\ndisconnected.\n\nReverting the commit allows making the call to phy_stop() unconditional\nin -\u003estop()."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: usbnet: Ejecutar unregister_netdev() antes unbind() de nuevo El commit 2c9d6c2b871d (\"usbnet: run unbind() antes unregister_netdev()\") buscaba corregir un uso despu\u00e9s de liberaci\u00f3n (use-after-free) al desconectar los adaptadores USB Ethernet. Resulta que es necesaria una correcci\u00f3n diferente para abordar el problema: https://lore.kernel.org/netdev/18b3541e5372bc9b9fc733d422f4e698c089077c.1650177997.git.lukas@wunner.de/ Por lo tanto, el commit no era necesario. El commit hizo que la vinculaci\u00f3n y desvinculaci\u00f3n de USB Ethernet fuera asim\u00e9trica: antes, usbnet_probe() primero invocaba la devoluci\u00f3n de llamada -\u0026amp;gtbind() y luego register_netdev(). usbnet_disconnect() reflej\u00f3 eso al invocar primero unregister_netdev() y luego -\u0026amp;gtunbind(). Desde el commit, el orden en usbnet_disconnect() se invierte y ya no refleja usbnet_probe(). Una consecuencia es que un PHY desconectado (y detenido) en -\u0026amp;gtunbind() se detiene luego una vez m\u00e1s por unregister_netdev() ya que cierra el netdev antes de anular el registro. Eso requiere una contorsi\u00f3n en -\u0026amp;gtstop() porque el PHY solo se puede detener si no se ha desconectado ya. Revertir el commit permite hacer que la llamada a phy_stop() sea incondicional en -\u0026amp;gtstop().\n"
}
],
"id": "CVE-2022-49501",
"lastModified": "2025-03-24T19:43:13.750",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
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"published": "2025-02-26T07:01:26.257",
"references": [
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"url": "https://git.kernel.org/stable/c/6d5deb242874d924beccf7eb3cef04c1c3b0da79"
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
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"description": [
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"lang": "en",
"value": "CWE-416"
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],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
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- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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