CVE-2022-49501

{"id": "CVE-2022-49501", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "published": "2025-02-26T07:01:26.257", "references": [{"url": "https://git.kernel.org/stable/c/6d5deb242874d924beccf7eb3cef04c1c3b0da79", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/969a1b3ea3cb7d58a16fe12fd1b04bfc0ea40509", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/d1408f6b4dd78fb1b9e26bcf64477984e5f85409", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/fbda837107f9bd4ec658d2aa88c6856dba606f06", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-416"}]}], "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 ->bind() callback and then\nregister_netdev(). usbnet_disconnect() mirrored that by first invoking\nunregister_netdev() and then ->unbind().\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 ->unbind()\nis afterwards stopped once more by unregister_netdev() as it closes the\nnetdev before unregistering. That necessitates a contortion in ->stop()\nbecause the PHY may only be stopped if it hasn't already been\ndisconnected.\n\nReverting the commit allows making the call to phy_stop() unconditional\nin ->stop()."}, {"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 -&gtbind() y luego register_netdev(). usbnet_disconnect() reflej\u00f3 eso al invocar primero unregister_netdev() y luego -&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 -&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 -&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 -&gtstop().\n"}], "lastModified": "2025-03-24T19:43:13.750", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "40E62665-0BA6-440F-83E8-6F8EC2D3C9DF", "versionEndExcluding": "5.15.46"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "15E2DD33-2255-4B76-9C15-04FF8CBAB252", "versionEndExcluding": "5.17.14", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8E122216-2E9E-4B3E-B7B8-D575A45BA3C2", "versionEndExcluding": "5.18.3", "versionStartIncluding": "5.18"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}