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

Vulnerability from cvelistv5 – Published: 2024-06-20 11:13 – Updated: 2025-12-23 13:20
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.
Assigner
References
Impacted products
Vendor Product Version
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)
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    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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{\"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\"}], \"programFiles\": [\"drivers/usb/core/hcd.c\", \"drivers/usb/core/urb.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.29\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.29\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.4.302\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.4.*\"}, {\"status\": \"unaffected\", \"version\": \"4.9.300\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.265\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.228\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.176\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.96\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.19\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.16.*\"}, {\"status\": \"unaffected\", \"version\": \"5.17\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/usb/core/hcd.c\", \"drivers/usb/core/urb.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/5f138ef224dffd15d5e5c5b095859719e0038427\"}, {\"url\": \"https://git.kernel.org/stable/c/b50f5ca60475710bbc9a3af32fbfc17b1e69c2f0\"}, {\"url\": \"https://git.kernel.org/stable/c/546ba238535d925254e0b3f12012a5c55801e2f3\"}, {\"url\": \"https://git.kernel.org/stable/c/5904dfd3ddaff3bf4a41c3baf0a8e8f31ed4599b\"}, {\"url\": \"https://git.kernel.org/stable/c/9c61fce322ac2ef7fecf025285353570d60e41d6\"}, {\"url\": \"https://git.kernel.org/stable/c/e3b131e30e612ff0e32de6c1cb4f69f89db29193\"}, {\"url\": \"https://git.kernel.org/stable/c/9340226388c66a7e090ebb00e91ed64a753b6c26\"}, {\"url\": \"https://git.kernel.org/stable/c/c9a18f7c5b071dce5e6939568829d40994866ab0\"}, {\"url\": \"https://git.kernel.org/stable/c/26fbe9772b8c459687930511444ce443011f86bf\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"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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Sightings

Author Source Type Date

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.