{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50220", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-06-18T10:57:27.430Z", "datePublished": "2025-06-18T11:03:55.461Z", "dateUpdated": "2026-05-11T19:15:07.972Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T19:15:07.972Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/usb/usbnet.c" ], "versions": [ { "version": "23f333a2bfafba80339315b724808982a9de57d9", "lessThan": "d2d6b530d89b0a912148018027386aa049f0a309", "status": "affected", "versionType": "git" }, { "version": "23f333a2bfafba80339315b724808982a9de57d9", "lessThan": "e2a521a7dcc463c5017b4426ca0804e151faeff7", "status": "affected", "versionType": "git" }, { "version": "23f333a2bfafba80339315b724808982a9de57d9", "lessThan": "7f77dcbc030c2faa6d8e8a594985eeb34018409e", "status": "affected", "versionType": "git" }, { "version": "23f333a2bfafba80339315b724808982a9de57d9", "lessThan": "8b4588b8b00b299be16a35be67b331d8fdba03f3", "status": "affected", "versionType": "git" }, { "version": "23f333a2bfafba80339315b724808982a9de57d9", "lessThan": "135199a2edd459d2b123144efcd7f9bcd95128e4", "status": "affected", "versionType": "git" }, { "version": "23f333a2bfafba80339315b724808982a9de57d9", "lessThan": "635fd8953e4309b54ca6a81bed1d4a87668694f4", "status": "affected", "versionType": "git" }, { "version": "23f333a2bfafba80339315b724808982a9de57d9", "lessThan": "d49bb8cf9bfaa06aa527eb30f1a52a071da2e32f", "status": "affected", "versionType": "git" }, { "version": "23f333a2bfafba80339315b724808982a9de57d9", "lessThan": "db3b738ae5f726204876f4303c49cfdf4311403f", "status": "affected", "versionType": "git" }, { "version": "23f333a2bfafba80339315b724808982a9de57d9", "lessThan": "a69e617e533edddf3fa3123149900f36e0a6dc74", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/usb/usbnet.c" ], "versions": [ { "version": "2.6.38", "status": "affected" }, { "version": "0", "lessThan": "2.6.38", "status": "unaffected", "versionType": "semver" }, { "version": "4.9.326", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.291", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.256", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.211", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.137", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.61", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.18.18", "lessThanOrEqual": "5.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19.2", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "4.9.326" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "4.14.291" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "4.19.256" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "5.4.211" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "5.10.137" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "5.15.61" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "5.18.18" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "5.19.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "6.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d2d6b530d89b0a912148018027386aa049f0a309" }, { "url": "https://git.kernel.org/stable/c/e2a521a7dcc463c5017b4426ca0804e151faeff7" }, { "url": "https://git.kernel.org/stable/c/7f77dcbc030c2faa6d8e8a594985eeb34018409e" }, { "url": "https://git.kernel.org/stable/c/8b4588b8b00b299be16a35be67b331d8fdba03f3" }, { "url": "https://git.kernel.org/stable/c/135199a2edd459d2b123144efcd7f9bcd95128e4" }, { "url": "https://git.kernel.org/stable/c/635fd8953e4309b54ca6a81bed1d4a87668694f4" }, { "url": "https://git.kernel.org/stable/c/d49bb8cf9bfaa06aa527eb30f1a52a071da2e32f" }, { "url": "https://git.kernel.org/stable/c/db3b738ae5f726204876f4303c49cfdf4311403f" }, { "url": "https://git.kernel.org/stable/c/a69e617e533edddf3fa3123149900f36e0a6dc74" } ], "title": "usbnet: Fix linkwatch use-after-free on disconnect", "x_generator": { "engine": "bippy-1.2.0" } } } }