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CVE-2022-48760 (GCVE-0-2022-48760)

Vulnerability from cvelistv5 – Published: 2024-06-20 11:13 – Updated: 2026-05-11 18:46
VLAI
Title
USB: core: Fix hang in usb_kill_urb by adding memory barriers
Summary
In the Linux kernel, the following vulnerability has been resolved: USB: core: Fix hang in usb_kill_urb by adding memory barriers The syzbot fuzzer has identified a bug in which processes hang waiting for usb_kill_urb() to return. It turns out the issue is not unlinking the URB; that works just fine. Rather, the problem arises when the wakeup notification that the URB has completed is not received. The reason is memory-access ordering on SMP systems. In outline form, usb_kill_urb() and __usb_hcd_giveback_urb() operating concurrently on different CPUs perform the following actions: CPU 0 CPU 1 ---------------------------- --------------------------------- usb_kill_urb(): __usb_hcd_giveback_urb(): ... ... atomic_inc(&urb->reject); atomic_dec(&urb->use_count); ... ... wait_event(usb_kill_urb_queue, atomic_read(&urb->use_count) == 0); if (atomic_read(&urb->reject)) wake_up(&usb_kill_urb_queue); Confining your attention to urb->reject and urb->use_count, you can see that the overall pattern of accesses on CPU 0 is: write urb->reject, then read urb->use_count; whereas the overall pattern of accesses on CPU 1 is: write urb->use_count, then read urb->reject. This pattern is referred to in memory-model circles as SB (for "Store Buffering"), and it is well known that without suitable enforcement of the desired order of accesses -- in the form of memory barriers -- it is entirely possible for one or both CPUs to execute their reads ahead of their writes. The end result will be that sometimes CPU 0 sees the old un-decremented value of urb->use_count while CPU 1 sees the old un-incremented value of urb->reject. Consequently CPU 0 ends up on the wait queue and never gets woken up, leading to the observed hang in usb_kill_urb(). The same pattern of accesses occurs in usb_poison_urb() and the failure pathway of usb_hcd_submit_urb(). The problem is fixed by adding suitable memory barriers. To provide proper memory-access ordering in the SB pattern, a full barrier is required on both CPUs. The atomic_inc() and atomic_dec() accesses themselves don't provide any memory ordering, but since they are present, we can use the optimized smp_mb__after_atomic() memory barrier in the various routines to obtain the desired effect. This patch adds the necessary memory barriers.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-20 14:49 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 49367d8f1d9f26482cf7089489e90f0afd0a942c , < 5f138ef224dffd15d5e5c5b095859719e0038427 (git)
Affected: 49367d8f1d9f26482cf7089489e90f0afd0a942c , < b50f5ca60475710bbc9a3af32fbfc17b1e69c2f0 (git)
Affected: 49367d8f1d9f26482cf7089489e90f0afd0a942c , < 546ba238535d925254e0b3f12012a5c55801e2f3 (git)
Affected: 49367d8f1d9f26482cf7089489e90f0afd0a942c , < 5904dfd3ddaff3bf4a41c3baf0a8e8f31ed4599b (git)
Affected: 49367d8f1d9f26482cf7089489e90f0afd0a942c , < 9c61fce322ac2ef7fecf025285353570d60e41d6 (git)
Affected: 49367d8f1d9f26482cf7089489e90f0afd0a942c , < e3b131e30e612ff0e32de6c1cb4f69f89db29193 (git)
Affected: 49367d8f1d9f26482cf7089489e90f0afd0a942c , < 9340226388c66a7e090ebb00e91ed64a753b6c26 (git)
Affected: 49367d8f1d9f26482cf7089489e90f0afd0a942c , < c9a18f7c5b071dce5e6939568829d40994866ab0 (git)
Affected: 49367d8f1d9f26482cf7089489e90f0afd0a942c , < 26fbe9772b8c459687930511444ce443011f86bf (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.29
Unaffected: 0 , < 2.6.29 (semver)
Unaffected: 4.4.302 , ≤ 4.4.* (semver)
Unaffected: 4.9.300 , ≤ 4.9.* (semver)
Unaffected: 4.14.265 , ≤ 4.14.* (semver)
Unaffected: 4.19.228 , ≤ 4.19.* (semver)
Unaffected: 5.4.176 , ≤ 5.4.* (semver)
Unaffected: 5.10.96 , ≤ 5.10.* (semver)
Unaffected: 5.15.19 , ≤ 5.15.* (semver)
Unaffected: 5.16.5 , ≤ 5.16.* (semver)
Unaffected: 5.17 , ≤ * (original_commit_for_fix)
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The end result will be that sometimes CPU 0 sees the\\nold un-decremented value of urb-\u003euse_count while CPU 1 sees the old\\nun-incremented value of urb-\u003ereject.  Consequently CPU 0 ends up on\\nthe wait queue and never gets woken up, leading to the observed hang\\nin usb_kill_urb().\\n\\nThe same pattern of accesses occurs in usb_poison_urb() and the\\nfailure pathway of usb_hcd_submit_urb().\\n\\nThe problem is fixed by adding suitable memory barriers.  To provide\\nproper memory-access ordering in the SB pattern, a full barrier is\\nrequired on both CPUs.  The atomic_inc() and atomic_dec() accesses\\nthemselves don\u0027t provide any memory ordering, but since they are\\npresent, we can use the optimized smp_mb__after_atomic() memory\\nbarrier in the various routines to obtain the desired effect.\\n\\nThis patch adds the necessary memory barriers.\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se resolvi\\u00f3 la siguiente vulnerabilidad: USB: core: corrige el bloqueo en usb_kill_urb agregando barreras de memoria el syzbot fuzzer ha identificado un error en el que los procesos se bloquean esperando que regrese usb_kill_urb(). Resulta que el problema no es desvincular la URB; eso funciona bien. M\\u00e1s bien, el problema surge cuando no se recibe la notificaci\\u00f3n de activaci\\u00f3n de que la URB ha completado. El motivo son los pedidos de acceso a la memoria en los sistemas SMP. En forma resumida, usb_kill_urb() y __usb_hcd_giveback_urb() operando simult\\u00e1neamente en diferentes CPU realizan las siguientes acciones: CPU 0 CPU 1 ------------------------- --- --------------------------------- usb_kill_urb(): __usb_hcd_giveback_urb(): ... ... atomic_inc(\u0026amp;urb-\u0026gt;rechazar); atomic_dec(\u0026amp;urb-\u0026gt;use_count); ... ... wait_event(usb_kill_urb_queue, atomic_read(\u0026amp;urb-\u0026gt;use_count) == 0); if (atomic_read(\u0026amp;urb-\u0026gt;reject)) wake_up(\u0026amp;usb_kill_urb_queue); Limitando su atenci\\u00f3n a urb-\u0026gt;reject y urb-\u0026gt;use_count, puede ver que el patr\\u00f3n general de accesos en la CPU 0 es: escribir urb-\u0026gt;reject, luego leer urb-\u0026gt;use_count; mientras que el patr\\u00f3n general de accesos en la CPU 1 es: escribir urb-\u0026gt;use_count, luego leer urb-\u0026gt;reject. En los c\\u00edrculos de modelos de memoria se hace referencia a este patr\\u00f3n como SB (por \\\"Store Buffering\\\"), y es bien sabido que sin una aplicaci\\u00f3n adecuada del orden deseado de accesos (en forma de barreras de memoria) es completamente posible que una o ambas CPU para ejecutar sus lecturas antes de sus escrituras. El resultado final ser\\u00e1 que a veces la CPU 0 ve el antiguo valor no incrementado de urb-\u0026gt;use_count mientras que la CPU 1 ve el antiguo valor no incrementado de urb-\u0026gt;reject. En consecuencia, la CPU 0 termina en la cola de espera y nunca se activa, lo que provoca el bloqueo observado en usb_kill_urb(). El mismo patr\\u00f3n de accesos ocurre en usb_poison_urb() y la ruta de falla de usb_hcd_submit_urb(). El problema se soluciona agregando barreras de memoria adecuadas. Para proporcionar un orden adecuado de acceso a la memoria en el patr\\u00f3n SB, se requiere una barrera completa en ambas CPU. Los accesos atomic_inc() y atomic_dec() en s\\u00ed no proporcionan ning\\u00fan orden de memoria, pero como est\\u00e1n presentes, podemos usar la barrera de memoria optimizada smp_mb__after_atomic() en las distintas rutinas para obtener el efecto deseado. Este parche agrega las barreras de memoria necesarias.\"}]",
      "id": "CVE-2022-48760",
      "lastModified": "2024-11-21T07:33:57.913",
      "published": "2024-06-20T12:15:14.110",
      "references": "[{\"url\": \"https://git.kernel.org/stable/c/26fbe9772b8c459687930511444ce443011f86bf\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/546ba238535d925254e0b3f12012a5c55801e2f3\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/5904dfd3ddaff3bf4a41c3baf0a8e8f31ed4599b\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/5f138ef224dffd15d5e5c5b095859719e0038427\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/9340226388c66a7e090ebb00e91ed64a753b6c26\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/9c61fce322ac2ef7fecf025285353570d60e41d6\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/b50f5ca60475710bbc9a3af32fbfc17b1e69c2f0\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/c9a18f7c5b071dce5e6939568829d40994866ab0\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/e3b131e30e612ff0e32de6c1cb4f69f89db29193\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}, {\"url\": \"https://git.kernel.org/stable/c/26fbe9772b8c459687930511444ce443011f86bf\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/546ba238535d925254e0b3f12012a5c55801e2f3\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/5904dfd3ddaff3bf4a41c3baf0a8e8f31ed4599b\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/5f138ef224dffd15d5e5c5b095859719e0038427\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/9340226388c66a7e090ebb00e91ed64a753b6c26\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/9c61fce322ac2ef7fecf025285353570d60e41d6\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/b50f5ca60475710bbc9a3af32fbfc17b1e69c2f0\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/c9a18f7c5b071dce5e6939568829d40994866ab0\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://git.kernel.org/stable/c/e3b131e30e612ff0e32de6c1cb4f69f89db29193\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}]",
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Awaiting Analysis"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-48760\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-06-20T12:15:14.110\",\"lastModified\":\"2026-06-17T05:16:07.523\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nUSB: core: Fix hang in usb_kill_urb by adding memory barriers\\n\\nThe syzbot fuzzer has identified a bug in which processes hang waiting\\nfor usb_kill_urb() to return.  It turns out the issue is not unlinking\\nthe URB; that works just fine.  Rather, the problem arises when the\\nwakeup notification that the URB has completed is not received.\\n\\nThe reason is memory-access ordering on SMP systems.  In outline form,\\nusb_kill_urb() and __usb_hcd_giveback_urb() operating concurrently on\\ndifferent CPUs perform the following actions:\\n\\nCPU 0\\t\\t\\t\\t\\tCPU 1\\n----------------------------\\t\\t---------------------------------\\nusb_kill_urb():\\t\\t\\t\\t__usb_hcd_giveback_urb():\\n  ...\\t\\t\\t\\t\\t  ...\\n  atomic_inc(\u0026urb-\u003ereject);\\t\\t  atomic_dec(\u0026urb-\u003euse_count);\\n  ...\\t\\t\\t\\t\\t  ...\\n  wait_event(usb_kill_urb_queue,\\n\\tatomic_read(\u0026urb-\u003euse_count) == 0);\\n\\t\\t\\t\\t\\t  if (atomic_read(\u0026urb-\u003ereject))\\n\\t\\t\\t\\t\\t\\twake_up(\u0026usb_kill_urb_queue);\\n\\nConfining your attention to urb-\u003ereject and urb-\u003euse_count, you can\\nsee that the overall pattern of accesses on CPU 0 is:\\n\\n\\twrite urb-\u003ereject, then read urb-\u003euse_count;\\n\\nwhereas the overall pattern of accesses on CPU 1 is:\\n\\n\\twrite urb-\u003euse_count, then read urb-\u003ereject.\\n\\nThis pattern is referred to in memory-model circles as SB (for \\\"Store\\nBuffering\\\"), and it is well known that without suitable enforcement of\\nthe desired order of accesses -- in the form of memory barriers -- it\\nis entirely possible for one or both CPUs to execute their reads ahead\\nof their writes.  The end result will be that sometimes CPU 0 sees the\\nold un-decremented value of urb-\u003euse_count while CPU 1 sees the old\\nun-incremented value of urb-\u003ereject.  Consequently CPU 0 ends up on\\nthe wait queue and never gets woken up, leading to the observed hang\\nin usb_kill_urb().\\n\\nThe same pattern of accesses occurs in usb_poison_urb() and the\\nfailure pathway of usb_hcd_submit_urb().\\n\\nThe problem is fixed by adding suitable memory barriers.  To provide\\nproper memory-access ordering in the SB pattern, a full barrier is\\nrequired on both CPUs.  The atomic_inc() and atomic_dec() accesses\\nthemselves don\u0027t provide any memory ordering, but since they are\\npresent, we can use the optimized smp_mb__after_atomic() memory\\nbarrier in the various routines to obtain the desired effect.\\n\\nThis patch adds the necessary memory barriers.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: USB: core: corrige el bloqueo en usb_kill_urb agregando barreras de memoria el syzbot fuzzer ha identificado un error en el que los procesos se bloquean esperando que regrese usb_kill_urb(). Resulta que el problema no es desvincular la URB; eso funciona bien. M\u00e1s bien, el problema surge cuando no se recibe la notificaci\u00f3n de activaci\u00f3n de que la URB ha completado. El motivo son los pedidos de acceso a la memoria en los sistemas SMP. En forma resumida, usb_kill_urb() y __usb_hcd_giveback_urb() operando simult\u00e1neamente en diferentes CPU realizan las siguientes acciones: CPU 0 CPU 1 ------------------------- --- --------------------------------- usb_kill_urb(): __usb_hcd_giveback_urb(): ... ... atomic_inc(\u0026amp;urb-\u0026gt;rechazar); atomic_dec(\u0026amp;urb-\u0026gt;use_count); ... ... wait_event(usb_kill_urb_queue, atomic_read(\u0026amp;urb-\u0026gt;use_count) == 0); if (atomic_read(\u0026amp;urb-\u0026gt;reject)) wake_up(\u0026amp;usb_kill_urb_queue); Limitando su atenci\u00f3n a urb-\u0026gt;reject y urb-\u0026gt;use_count, puede ver que el patr\u00f3n general de accesos en la CPU 0 es: escribir urb-\u0026gt;reject, luego leer urb-\u0026gt;use_count; mientras que el patr\u00f3n general de accesos en la CPU 1 es: escribir urb-\u0026gt;use_count, luego leer urb-\u0026gt;reject. En los c\u00edrculos de modelos de memoria se hace referencia a este patr\u00f3n como SB (por \\\"Store Buffering\\\"), y es bien sabido que sin una aplicaci\u00f3n adecuada del orden deseado de accesos (en forma de barreras de memoria) es completamente posible que una o ambas CPU para ejecutar sus lecturas antes de sus escrituras. El resultado final ser\u00e1 que a veces la CPU 0 ve el antiguo valor no incrementado de urb-\u0026gt;use_count mientras que la CPU 1 ve el antiguo valor no incrementado de urb-\u0026gt;reject. En consecuencia, la CPU 0 termina en la cola de espera y nunca se activa, lo que provoca el bloqueo observado en usb_kill_urb(). El mismo patr\u00f3n de accesos ocurre en usb_poison_urb() y la ruta de falla de usb_hcd_submit_urb(). El problema se soluciona agregando barreras de memoria adecuadas. Para proporcionar un orden adecuado de acceso a la memoria en el patr\u00f3n SB, se requiere una barrera completa en ambas CPU. Los accesos atomic_inc() y atomic_dec() en s\u00ed no proporcionan ning\u00fan orden de memoria, pero como est\u00e1n presentes, podemos usar la barrera de memoria optimizada smp_mb__after_atomic() en las distintas rutinas para obtener el efecto deseado. Este parche agrega las barreras de memoria necesarias.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/usb/core/hcd.c\",\"drivers/usb/core/urb.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"49367d8f1d9f26482cf7089489e90f0afd0a942c\",\"lessThan\":\"5f138ef224dffd15d5e5c5b095859719e0038427\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"49367d8f1d9f26482cf7089489e90f0afd0a942c\",\"lessThan\":\"b50f5ca60475710bbc9a3af32fbfc17b1e69c2f0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"49367d8f1d9f26482cf7089489e90f0afd0a942c\",\"lessThan\":\"546ba238535d925254e0b3f12012a5c55801e2f3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"49367d8f1d9f26482cf7089489e90f0afd0a942c\",\"lessThan\":\"5904dfd3ddaff3bf4a41c3baf0a8e8f31ed4599b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"49367d8f1d9f26482cf7089489e90f0afd0a942c\",\"lessThan\":\"9c61fce322ac2ef7fecf025285353570d60e41d6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"49367d8f1d9f26482cf7089489e90f0afd0a942c\",\"lessThan\":\"e3b131e30e612ff0e32de6c1cb4f69f89db29193\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"49367d8f1d9f26482cf7089489e90f0afd0a942c\",\"lessThan\":\"9340226388c66a7e090ebb00e91ed64a753b6c26\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"49367d8f1d9f26482cf7089489e90f0afd0a942c\",\"lessThan\":\"c9a18f7c5b071dce5e6939568829d40994866ab0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"49367d8f1d9f26482cf7089489e90f0afd0a942c\",\"lessThan\":\"26fbe9772b8c459687930511444ce443011f86bf\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/usb/core/hcd.c\",\"drivers/usb/core/urb.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.29\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.29\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.4.302\",\"lessThanOrEqual\":\"4.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.9.300\",\"lessThanOrEqual\":\"4.9.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.14.265\",\"lessThanOrEqual\":\"4.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.228\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.176\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.96\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.19\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.16.5\",\"lessThanOrEqual\":\"5.16.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.17\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2024-06-20T14:49:44.326446Z\",\"id\":\"CVE-2022-48760\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA 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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-06-28T11:40:37+00:00",
      "cve": "CVE-2022-48760",
      "id": "CVE-2022-48760",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:fixed": "150",
      "product_status:known_affected": "150",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: USB: core: Fix hang in usb_kill_urb by adding memory barriers",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-48760.json",
      "version": "3"
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    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T02:34:13Z",
      "cve": "CVE-2022-48760",
      "id": "CVE-2022-48760",
      "initial_release_date": "2024-06-22T04:08:55Z",
      "product_status:known_affected": "423",
      "product_status:known_not_affected": "69",
      "product_status:recommended": "644",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-48760",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-48760.json",
      "version": "67"
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It turns out the issue is not unlinking\\nthe URB; that works just fine.  Rather, the problem arises when the\\nwakeup notification that the URB has completed is not received.\\n\\nThe reason is memory-access ordering on SMP systems.  In outline form,\\nusb_kill_urb() and __usb_hcd_giveback_urb() operating concurrently on\\ndifferent CPUs perform the following actions:\\n\\nCPU 0\\t\\t\\t\\t\\tCPU 1\\n----------------------------\\t\\t---------------------------------\\nusb_kill_urb():\\t\\t\\t\\t__usb_hcd_giveback_urb():\\n  ...\\t\\t\\t\\t\\t  ...\\n  atomic_inc(\u0026urb-\u003ereject);\\t\\t  atomic_dec(\u0026urb-\u003euse_count);\\n  ...\\t\\t\\t\\t\\t  ...\\n  wait_event(usb_kill_urb_queue,\\n\\tatomic_read(\u0026urb-\u003euse_count) == 0);\\n\\t\\t\\t\\t\\t  if (atomic_read(\u0026urb-\u003ereject))\\n\\t\\t\\t\\t\\t\\twake_up(\u0026usb_kill_urb_queue);\\n\\nConfining your attention to urb-\u003ereject and urb-\u003euse_count, you can\\nsee that the overall pattern of accesses on CPU 0 is:\\n\\n\\twrite urb-\u003ereject, then read urb-\u003euse_count;\\n\\nwhereas the overall pattern of accesses on CPU 1 is:\\n\\n\\twrite urb-\u003euse_count, then read urb-\u003ereject.\\n\\nThis pattern is referred to in memory-model circles as SB (for \\\"Store\\nBuffering\\\"), and it is well known that without suitable enforcement of\\nthe desired order of accesses -- in the form of memory barriers -- it\\nis entirely possible for one or both CPUs to execute their reads ahead\\nof their writes.  The end result will be that sometimes CPU 0 sees the\\nold un-decremented value of urb-\u003euse_count while CPU 1 sees the old\\nun-incremented value of urb-\u003ereject.  Consequently CPU 0 ends up on\\nthe wait queue and never gets woken up, leading to the observed hang\\nin usb_kill_urb().\\n\\nThe same pattern of accesses occurs in usb_poison_urb() and the\\nfailure pathway of usb_hcd_submit_urb().\\n\\nThe problem is fixed by adding suitable memory barriers.  To provide\\nproper memory-access ordering in the SB pattern, a full barrier is\\nrequired on both CPUs.  The atomic_inc() and atomic_dec() accesses\\nthemselves don\u0027t provide any memory ordering, but since they are\\npresent, we can use the optimized smp_mb__after_atomic() memory\\nbarrier in the various routines to obtain the desired effect.\\n\\nThis patch adds the necessary memory barriers.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.302\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.300\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.265\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.228\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.176\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.96\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.19\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16.5\", \"versionStartIncluding\": \"2.6.29\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.17\", \"versionStartIncluding\": \"2.6.29\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-12-23T13:20:18.737Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-48760\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-12-23T13:20:18.737Z\", \"dateReserved\": \"2024-06-20T11:09:39.059Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-06-20T11:13:38.532Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.