{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"HIGH" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"In the Linux kernel, the following vulnerability has been resolved:\n\nusbnet: Fix linkwatch use-after-free on disconnect\n\nusbnet uses the work usbnet_deferred_kevent() to perform tasks which may\nsleep. On disconnect, completion of the work was originally awaited in\n->ndo_stop(). But in 2003, that was moved to ->disconnect() by historic\ncommit \"[PATCH] USB: usbnet, prevent exotic rtnl deadlock\":\n\n https://git.kernel.org/tglx/history/c/0f138bbfd83c\n\nThe change was made because back then, the kernel's workqueue\nimplementation did not allow waiting for a single work. One had to wait\nfor completion of *all* work by calling flush_scheduled_work(), and that\ncould deadlock when waiting for usbnet_deferred_kevent() with rtnl_mutex\nheld in ->ndo_stop().\n\nThe commit solved one problem but created another: It causes a\nuse-after-free in USB Ethernet drivers aqc111.c, asix_devices.c,\nax88179_178a.c, ch9200.c and smsc75xx.c:\n\n* If the drivers receive a link change interrupt immediately before\n disconnect, they raise EVENT_LINK_RESET in their (non-sleepable)\n ->status() callback and schedule usbnet_deferred_kevent().\n* usbnet_deferred_kevent() invokes the driver's ->link_reset() callback,\n which calls netif_carrier_{on,off}().\n* That in turn schedules the work linkwatch_event().\n\nBecause usbnet_deferred_kevent() is awaited after unregister_netdev(),\nnetif_carrier_{on,off}() may operate on an unregistered netdev and\nlinkwatch_event() may run after free_netdev(), causing a use-after-free.\n\nIn 2010, usbnet was changed to only wait for a single instance of\nusbnet_deferred_kevent() instead of *all* work by commit 23f333a2bfaf\n(\"drivers/net: don't use flush_scheduled_work()\").\n\nUnfortunately the commit neglected to move the wait back to\n->ndo_stop(). Rectify that omission at long last.", "category":"general", "title":"Synopsis" } ], "publisher":{ "issuing_authority":"openEuler security committee", "name":"openEuler", "namespace":"https://www.openeuler.org", "contact_details":"openeuler-security@openeuler.org", "category":"vendor" }, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50220" }, { "summary":"CVE-2022-50220 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2022/csaf-openeuler-cve-2022-50220.json" }, { "summary":"openEuler-SA-2025-1820", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2025-1820" }, { "summary":"CVE-2022-50220", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2022-50220&packageName=kernel" } ], "title":"openEuler cve CVE-2022-50220", "tracking":{ "initial_release_date":"2025-07-11T20:21:19+08:00", "revision_history":[ { "date":"2025-07-11T20:21:19+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2025-07-11T20:21:19+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2025-07-11T20:21:19+08:00", "id":"CVE-2022-50220", "version":"1.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:20.03-LTS-SP4" }, "product_id":"openEuler-20.03-LTS-SP4", "name":"openEuler-20.03-LTS-SP4" }, "name":"openEuler-20.03-LTS-SP4", "category":"product_version" } ], "category":"product_name" }, { "name":"aarch64", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:20.03-LTS-SP4" }, "product_id":"bpftool-4.19.90-2507.2.0.0335.oe2003sp4.aarch64.rpm", "name":"bpftool-4.19.90-2507.2.0.0335.oe2003sp4.aarch64.rpm" }, 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On disconnect, completion of the work was originally awaited in\n->ndo_stop(). But in 2003, that was moved to ->disconnect() by historic\ncommit \"[PATCH] USB: usbnet, prevent exotic rtnl deadlock\":\n\n https://git.kernel.org/tglx/history/c/0f138bbfd83c\n\nThe change was made because back then, the kernel's workqueue\nimplementation did not allow waiting for a single work. One had to wait\nfor completion of *all* work by calling flush_scheduled_work(), and that\ncould deadlock when waiting for usbnet_deferred_kevent() with rtnl_mutex\nheld in ->ndo_stop().\n\nThe commit solved one problem but created another: It causes a\nuse-after-free in USB Ethernet drivers aqc111.c, asix_devices.c,\nax88179_178a.c, ch9200.c and smsc75xx.c:\n\n* If the drivers receive a link change interrupt immediately before\n disconnect, they raise EVENT_LINK_RESET in their (non-sleepable)\n ->status() callback and schedule usbnet_deferred_kevent().\n* usbnet_deferred_kevent() invokes the driver's ->link_reset() callback,\n which calls netif_carrier_{on,off}().\n* That in turn schedules the work linkwatch_event().\n\nBecause usbnet_deferred_kevent() is awaited after unregister_netdev(),\nnetif_carrier_{on,off}() may operate on an unregistered netdev and\nlinkwatch_event() may run after free_netdev(), causing a use-after-free.\n\nIn 2010, usbnet was changed to only wait for a single instance of\nusbnet_deferred_kevent() instead of *all* work by commit 23f333a2bfaf\n(\"drivers/net: don't use flush_scheduled_work()\").\n\nUnfortunately the commit neglected to move the wait back to\n->ndo_stop(). Rectify that omission at long last.", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-20.03-LTS-SP4:bpftool-4.19.90-2507.2.0.0335.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:bpftool-debuginfo-4.19.90-2507.2.0.0335.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-4.19.90-2507.2.0.0335.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-debuginfo-4.19.90-2507.2.0.0335.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-debugsource-4.19.90-2507.2.0.0335.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-devel-4.19.90-2507.2.0.0335.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-source-4.19.90-2507.2.0.0335.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-tools-4.19.90-2507.2.0.0335.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-tools-debuginfo-4.19.90-2507.2.0.0335.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-tools-devel-4.19.90-2507.2.0.0335.oe2003sp4.aarch64", 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"vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:H", "version":"3.1" }, "products":[ "openEuler-20.03-LTS-SP4:bpftool-4.19.90-2507.2.0.0335.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:bpftool-debuginfo-4.19.90-2507.2.0.0335.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-4.19.90-2507.2.0.0335.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-debuginfo-4.19.90-2507.2.0.0335.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-debugsource-4.19.90-2507.2.0.0335.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-devel-4.19.90-2507.2.0.0335.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-source-4.19.90-2507.2.0.0335.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-tools-4.19.90-2507.2.0.0335.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-tools-debuginfo-4.19.90-2507.2.0.0335.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:kernel-tools-devel-4.19.90-2507.2.0.0335.oe2003sp4.aarch64", "openEuler-20.03-LTS-SP4:perf-4.19.90-2507.2.0.0335.oe2003sp4.aarch64", 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