CVE-2026-74677

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74677", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.925Z", "datePublished": "2026-08-22T15:32:46.001Z", "dateUpdated": "2026-08-22T15:32:46.001Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-22T15:32:46.001Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: ipheth: fix carrier_work UAF on disconnect\n\nipheth_sndbulk_callback() re-arms the carrier-check work on any\nnon-zero URB status:\n\n\telse\n\t\tschedule_delayed_work(&dev->carrier_work, 0);\n\nNothing ties that to the interface being up, so the work can be armed\nagain after ipheth_close() has already drained it, and stay armed\nuntil the netdev whose private area embeds it is freed.\n\nOn unplug with a TX URB in flight, ipheth_disconnect() drains the work\nthrough unregister_netdev() -> ipheth_close() ->\ncancel_delayed_work_sync() and only then calls ipheth_kill_urbs().\nusb_kill_urb() completes the in-flight TX URB with -ENOENT, so\nipheth_sndbulk_callback() runs after the drain and re-arms\ncarrier_work.\n\nThe same completion also re-arms the work if the interface is only\nbrought down while a TX URB is in flight, and\nipheth_carrier_check_work() then keeps re-queueing itself once a\nsecond. unregister_netdev() does not call ipheth_close() for an\nalready-down interface, so nothing drains it on the later unplug\neither.\n\nIn both cases free_netdev() frees the netdev while carrier_work is\nstill pending, and ipheth_carrier_check_work() dereferences freed\nmemory.\n\nTie the work to the interface state instead of chasing the completion:\ndisable it in ipheth_close() and enable it in ipheth_open(), so a\nschedule_delayed_work() from the URB completion is a no-op whenever\nthe interface is not up. disable_delayed_work_sync() also waits for a\nrunning instance, so it fully replaces the cancel_delayed_work_sync()\nit takes the place of. The work starts out disabled in ipheth_probe()\nso the enable/disable counts balance from the first open.\n\nReproduced under KASAN on linux-next (next-20260731) with dummy_hcd and\nraw-gadget standing in for the device, driving the second path above (the\ninterface is already down, so unregister_netdev() does not call\nipheth_close()): 15 of 15 unpatched boots report a slab-use-after-free in\n__run_timers(), freed by ipheth_disconnect() and re-armed from\nipheth_sndbulk_callback() via queue_delayed_work_on(). The\nsame trigger on a kernel differing only by this patch reports 0 of 15,\nand the carrier check still functions across open/close cycles.\n\nThe reproducer needs an attached USB device that stops draining bulk OUT,\nplus a link down and unplug, driven as root. It is not a privilege\nboundary crossing and no exploit primitive was developed.\n\nFound by 0sec (https://0sec.ai)."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/usb/ipheth.c"], "versions": [{"version": "bb1b40c7cb863f0800a6410c7dcb86cf3f28d3b1", "lessThan": "d07133fe1befae9a1e4c4c5e46ef0b73d2992020", "status": "affected", "versionType": "git"}, {"version": "bb1b40c7cb863f0800a6410c7dcb86cf3f28d3b1", "lessThan": "2c7496124e94c7f9c3daa5c5b1fb563ca9d62c45", "status": "affected", "versionType": "git"}, {"version": "bb1b40c7cb863f0800a6410c7dcb86cf3f28d3b1", "lessThan": "48303f3ae0fa6e102f3fc7dbf1688cc179131962", "status": "affected", "versionType": "git"}, {"version": "bb1b40c7cb863f0800a6410c7dcb86cf3f28d3b1", "lessThan": "fde39b8a521780391fb4e5bda2c0aa4928947f12", "status": "affected", "versionType": "git"}, {"version": "4f2df9fd07698bece3321fbf9e4b6dbcb9babccc", "status": "affected", "versionType": "git"}, {"version": "ea7d6be58c2e6c1f426b48994bb22b2393c90963", "status": "affected", "versionType": "git"}, {"version": "f5bca75dc46701f4c0d1dcbaae401233ae7ff06b", "status": "affected", "versionType": "git"}, {"version": "4.4.180", "lessThan": "4.5", "status": "affected", "versionType": "semver"}, {"version": "4.9.173", "lessThan": "4.10", "status": "affected", "versionType": "semver"}, {"version": "4.14.116", "lessThan": "4.15", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/usb/ipheth.c"], "versions": [{"version": "4.15", "status": "affected"}, {"version": "0", "lessThan": "4.15", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.104", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.9", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "4.15", "versionEndExcluding": "6.12.104"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "6.18.45"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "7.1.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.15", "versionEndExcluding": "7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.4.180"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9.173"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14.116"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/d07133fe1befae9a1e4c4c5e46ef0b73d2992020"}, {"url": "https://git.kernel.org/stable/c/2c7496124e94c7f9c3daa5c5b1fb563ca9d62c45"}, {"url": "https://git.kernel.org/stable/c/48303f3ae0fa6e102f3fc7dbf1688cc179131962"}, {"url": "https://git.kernel.org/stable/c/fde39b8a521780391fb4e5bda2c0aa4928947f12"}], "title": "net: usb: ipheth: fix carrier_work UAF on disconnect", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/usb/ipheth.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "d07133fe1befae9a1e4c4c5e46ef0b73d2992020", "status": "affected", "version": "bb1b40c7cb863f0800a6410c7dcb86cf3f28d3b1", "versionType": "git"}, {"lessThan": "2c7496124e94c7f9c3daa5c5b1fb563ca9d62c45", "status": "affected", "version": "bb1b40c7cb863f0800a6410c7dcb86cf3f28d3b1", "versionType": "git"}, {"lessThan": "48303f3ae0fa6e102f3fc7dbf1688cc179131962", "status": "affected", "version": "bb1b40c7cb863f0800a6410c7dcb86cf3f28d3b1", "versionType": "git"}, {"lessThan": "fde39b8a521780391fb4e5bda2c0aa4928947f12", "status": "affected", "version": "bb1b40c7cb863f0800a6410c7dcb86cf3f28d3b1", "versionType": "git"}, {"status": "affected", "version": "4f2df9fd07698bece3321fbf9e4b6dbcb9babccc", "versionType": "git"}, {"status": "affected", "version": "ea7d6be58c2e6c1f426b48994bb22b2393c90963", "versionType": "git"}, {"status": "affected", "version": "f5bca75dc46701f4c0d1dcbaae401233ae7ff06b", "versionType": "git"}, {"lessThan": "4.5", "status": "affected", "version": "4.4.180", "versionType": "semver"}, {"lessThan": "4.10", "status": "affected", "version": "4.9.173", "versionType": "semver"}, {"lessThan": "4.15", "status": "affected", "version": "4.14.116", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/usb/ipheth.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.15"}, {"lessThan": "4.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.104", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.45", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: ipheth: fix carrier_work UAF on disconnect\n\nipheth_sndbulk_callback() re-arms the carrier-check work on any\nnon-zero URB status:\n\n\telse\n\t\tschedule_delayed_work(&dev->carrier_work, 0);\n\nNothing ties that to the interface being up, so the work can be armed\nagain after ipheth_close() has already drained it, and stay armed\nuntil the netdev whose private area embeds it is freed.\n\nOn unplug with a TX URB in flight, ipheth_disconnect() drains the work\nthrough unregister_netdev() -> ipheth_close() ->\ncancel_delayed_work_sync() and only then calls ipheth_kill_urbs().\nusb_kill_urb() completes the in-flight TX URB with -ENOENT, so\nipheth_sndbulk_callback() runs after the drain and re-arms\ncarrier_work.\n\nThe same completion also re-arms the work if the interface is only\nbrought down while a TX URB is in flight, and\nipheth_carrier_check_work() then keeps re-queueing itself once a\nsecond. unregister_netdev() does not call ipheth_close() for an\nalready-down interface, so nothing drains it on the later unplug\neither.\n\nIn both cases free_netdev() frees the netdev while carrier_work is\nstill pending, and ipheth_carrier_check_work() dereferences freed\nmemory.\n\nTie the work to the interface state instead of chasing the completion:\ndisable it in ipheth_close() and enable it in ipheth_open(), so a\nschedule_delayed_work() from the URB completion is a no-op whenever\nthe interface is not up. disable_delayed_work_sync() also waits for a\nrunning instance, so it fully replaces the cancel_delayed_work_sync()\nit takes the place of. The work starts out disabled in ipheth_probe()\nso the enable/disable counts balance from the first open.\n\nReproduced under KASAN on linux-next (next-20260731) with dummy_hcd and\nraw-gadget standing in for the device, driving the second path above (the\ninterface is already down, so unregister_netdev() does not call\nipheth_close()): 15 of 15 unpatched boots report a slab-use-after-free in\n__run_timers(), freed by ipheth_disconnect() and re-armed from\nipheth_sndbulk_callback() via queue_delayed_work_on(). The\nsame trigger on a kernel differing only by this patch reports 0 of 15,\nand the carrier check still functions across open/close cycles.\n\nThe reproducer needs an attached USB device that stops draining bulk OUT,\nplus a link down and unplug, driven as root. It is not a privilege\nboundary crossing and no exploit primitive was developed.\n\nFound by 0sec (https://0sec.ai)."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: usb: ipheth: corregir uso despu\u00e9s de liberaci\u00f3n de carrier_work al desconectar\n\nipheth_sndbulk_callback() re-arma el trabajo de verificaci\u00f3n de portadora en cualquier estado URB distinto de cero:\n\n\telse\n\t\tschedule_delayed_work(&dev -> carrier_work, 0);\n\nNada vincula eso a que la interfaz est\u00e9 activa, por lo que el trabajo puede ser re-armado de nuevo despu\u00e9s de que ipheth_close() ya lo haya vaciado, y permanecer activado hasta que se libere el netdev cuya \u00e1rea privada lo incrusta.\n\nAl desconectar con un URB de TX en curso, ipheth_disconnect() vac\u00eda el trabajo a trav\u00e9s de unregister_netdev() -> ipheth_close() -> cancel_delayed_work_sync() y solo entonces llama a ipheth_kill_urbs(). usb_kill_urb() completa el URB de TX en curso con -ENOENT, por lo que ipheth_sndbulk_callback() se ejecuta despu\u00e9s del vaciado y re-arma carrier_work.\n\nLa misma finalizaci\u00f3n tambi\u00e9n re-arma el trabajo si la interfaz solo se desactiva mientras un URB de TX est\u00e1 en curso, e ipheth_carrier_check_work() luego sigue re-encol\u00e1ndose una vez por segundo. unregister_netdev() no llama a ipheth_close() para una interfaz ya inactiva, por lo que nada lo vac\u00eda en la desconexi\u00f3n posterior tampoco.\n\nEn ambos casos free_netdev() libera el netdev mientras carrier_work a\u00fan est\u00e1 pendiente, e ipheth_carrier_check_work() desreferencia memoria liberada.\n\nVincular el trabajo al estado de la interfaz en lugar de perseguir la finalizaci\u00f3n: desactivarlo en ipheth_close() y activarlo en ipheth_open(), para que un schedule_delayed_work() de la finalizaci\u00f3n del URB sea una operaci\u00f3n nula siempre que la interfaz no est\u00e9 activa. disable_delayed_work_sync() tambi\u00e9n espera una instancia en ejecuci\u00f3n, por lo que reemplaza completamente a cancel_delayed_work_sync() al que sustituye. El trabajo comienza desactivado en ipheth_probe() para que los recuentos de activaci\u00f3n/desactivaci\u00f3n se equilibren desde la primera apertura.\n\nReproducido bajo KASAN en linux-next (next-20260731) con dummy_hcd y raw-gadget sustituyendo al dispositivo, impulsando la segunda ruta anterior (la interfaz ya est\u00e1 inactiva, por lo que unregister_netdev() no llama a ipheth_close()): 15 de 15 arranques sin parchear informan de un uso despu\u00e9s de liberaci\u00f3n de slab en __run_timers(), liberado por ipheth_disconnect() y re-armado desde ipheth_sndbulk_callback() a trav\u00e9s de queue_delayed_work_on(). El mismo disparador en un kernel que difiere solo por este parche informa 0 de 15, y la verificaci\u00f3n de portadora sigue funcionando a trav\u00e9s de ciclos de apertura/cierre.\n\nEl reproductor necesita un dispositivo USB conectado que deja de vaciar bulk OUT, adem\u00e1s de un enlace ca\u00eddo y una desconexi\u00f3n, ejecutado como root. No es un cruce de l\u00edmites de privilegio y no se desarroll\u00f3 ning\u00fan primitivo de exploit.\n\nEncontrado por 0sec (https://0sec.ai)."}], "id": "CVE-2026-74677", "lastModified": "2026-10-14T13:10:00.187", "metrics": {}, "published": "2026-08-22T16:16:41.847", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2c7496124e94c7f9c3daa5c5b1fb563ca9d62c45"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/48303f3ae0fa6e102f3fc7dbf1688cc179131962"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d07133fe1befae9a1e4c4c5e46ef0b73d2992020"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fde39b8a521780391fb4e5bda2c0aa4928947f12"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: net: usb: ipheth: fix carrier_work UAF on disconnect", "id": "2521362", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521362"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's `ipheth` USB network driver. This vulnerability allows a local attacker with root privileges, using a specially crafted USB device, to trigger a Use-After-Free (UAF) condition. This occurs when the `carrier_work` mechanism attempts to access memory that has already been freed after the network interface has been closed or disconnected. Successful exploitation can lead to a system crash, resulting in a denial of service."], "name": "CVE-2026-74677", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74677\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74677\nhttps://lore.kernel.org/linux-cve-announce/2026082231-CVE-2026-74677-ecca@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bb1b40c7cb863f0800a6410c7dcb86cf3f28d3b1,d07133fe1befae9a1e4c4c5e46ef0b73d2992020)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bb1b40c7cb863f0800a6410c7dcb86cf3f28d3b1,2c7496124e94c7f9c3daa5c5b1fb563ca9d62c45)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bb1b40c7cb863f0800a6410c7dcb86cf3f28d3b1,48303f3ae0fa6e102f3fc7dbf1688cc179131962)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bb1b40c7cb863f0800a6410c7dcb86cf3f28d3b1,fde39b8a521780391fb4e5bda2c0aa4928947f12)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "4f2df9fd07698bece3321fbf9e4b6dbcb9babccc"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "ea7d6be58c2e6c1f426b48994bb22b2393c90963"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "f5bca75dc46701f4c0d1dcbaae401233ae7ff06b"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.4.180,4.5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.9.173,4.10)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.14.116,4.15)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.15"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.15)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.104,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.45,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.9,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-22T19:15:03.627756+00:00", "updated": "2026-08-24T20:00:04.405065+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}