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CVE-2026-80824 (GCVE-0-2026-80824)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:54 – Updated: 2026-09-04 15:54
VLAI
Title
usb: usbfs: fix use-after-free of usb_device in usbdev_release()
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: usbfs: fix use-after-free of usb_device in usbdev_release() usbdev_release() drops its reference to the struct usb_device before draining the list of completed async URBs, but that drain path reads back through the same object: free_async() calls dec_usb_memory_use_count() for any URB whose buffer came from the usbfs mmap() region, and its first statement is bus_to_hcd(ps->dev->bus). After a disconnect the usbfs reference can be the last one, in which case usb_put_dev() frees the device and the subsequent loop reads offset 80 of freed memory and uses the result as a struct usb_hcd *, which hcd_buffer_free_pages() then dereferences. This is reachable by an unprivileged process that has read/write access to a /dev/bus/usb node: mmap() the fd, submit one URB with a buffer inside the mapping, wait for the device to be unplugged, then munmap() and close(). It reproduces on every attempt rather than being a race, because a live MAP_SHARED vma holds a reference on the struct file, so usbdev_release() cannot run until the last vma is gone and the freeing branch of dec_usb_memory_use_count() is always taken. BUG: KASAN: slab-use-after-free in dec_usb_memory_use_count+0x3ae/0x410 Read of size 8 at addr ffff8880122ee050 by task poc/769 CPU: 1 UID: 1000 PID: 769 Comm: poc Tainted: G B 6.12.94 #3 Call Trace: dec_usb_memory_use_count+0x3ae/0x410 free_async+0x2aa/0x4f0 usbdev_release+0x375/0x460 __fput+0x3ea/0xb50 __x64_sys_close+0x86/0x100 Allocated by task 11: usb_alloc_dev+0x55/0xd90 hub_event+0x2524/0x43d0 Freed by task 769: kfree+0x121/0x360 device_release+0xd2/0x280 usb_put_dev+0x23/0x30 usbdev_release+0x2d8/0x460 Release the device reference after the drain loop instead. Nothing between the two points requires it to have been dropped.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f7d34b445abc00e979b7cf36b9580ac3d1a47cd8 , < 0a960b88c5979f853019d4dc4957dfbeeb193440 (git)
Affected: f7d34b445abc00e979b7cf36b9580ac3d1a47cd8 , < 96f5520fc9a5e4bbf77ac93c9d5ce502f597e6cf (git)
Affected: f7d34b445abc00e979b7cf36b9580ac3d1a47cd8 , < bd4bffc621a8cb2f4d9ed9b6447415de524a3bef (git)
Affected: f7d34b445abc00e979b7cf36b9580ac3d1a47cd8 , < 65879e0a452ca2a234b9475e0c11aff7a4343738 (git)
Affected: f7d34b445abc00e979b7cf36b9580ac3d1a47cd8 , < b3cde26a66b04f1d90ed0b675899c88b4e49d424 (git)
Affected: f7d34b445abc00e979b7cf36b9580ac3d1a47cd8 , < 5f08c45bdcfd28d1171de38c5ef29fc89a76eedc (git)
Affected: f7d34b445abc00e979b7cf36b9580ac3d1a47cd8 , < 7f0278e474c4d1c4457974ff1137cc385c944ab3 (git)
Affected: f7d34b445abc00e979b7cf36b9580ac3d1a47cd8 , < 47a7f98fbb5006d46d15a3a210ffdc61448a4f19 (git)
Affected: f7d34b445abc00e979b7cf36b9580ac3d1a47cd8 , < 0dd68b5d01d022fc9c5e71c82a82b0a94d3d0671 (git)
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Linux Linux Affected: 4.6
Unaffected: 0 , < 4.6 (semver)
Unaffected: 5.10.269 , ≤ 5.10.* (semver)
Unaffected: 5.15.220 , ≤ 5.15.* (semver)
Unaffected: 6.1.187 , ≤ 6.1.* (semver)
Unaffected: 6.6.156 , ≤ 6.6.* (semver)
Unaffected: 6.12.108 , ≤ 6.12.* (semver)
Unaffected: 6.18.49 , ≤ 6.18.* (semver)
Unaffected: 7.1.13 , ≤ 7.1.* (semver)
Unaffected: 7.2.3 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: usbfs: fix use-after-free of usb_device in usbdev_release()\n\nusbdev_release() drops its reference to the struct usb_device before\ndraining the list of completed async URBs, but that drain path reads back\nthrough the same object: free_async() calls dec_usb_memory_use_count()\nfor any URB whose buffer came from the usbfs mmap() region, and its first\nstatement is bus_to_hcd(ps-\u003edev-\u003ebus).\n\nAfter a disconnect the usbfs reference can be the last one, in which case\nusb_put_dev() frees the device and the subsequent loop reads offset 80 of\nfreed memory and uses the result as a struct usb_hcd *, which\nhcd_buffer_free_pages() then dereferences.\n\nThis is reachable by an unprivileged process that has read/write access to\na /dev/bus/usb node: mmap() the fd, submit one URB with a buffer inside the\nmapping, wait for the device to be unplugged, then munmap() and close().\nIt reproduces on every attempt rather than being a race, because a live\nMAP_SHARED vma holds a reference on the struct file, so usbdev_release()\ncannot run until the last vma is gone and the freeing branch of\ndec_usb_memory_use_count() is always taken.\n\n  BUG: KASAN: slab-use-after-free in dec_usb_memory_use_count+0x3ae/0x410\n  Read of size 8 at addr ffff8880122ee050 by task poc/769\n  CPU: 1 UID: 1000 PID: 769 Comm: poc Tainted: G    B    6.12.94 #3\n\n  Call Trace:\n   dec_usb_memory_use_count+0x3ae/0x410\n   free_async+0x2aa/0x4f0\n   usbdev_release+0x375/0x460\n   __fput+0x3ea/0xb50\n   __x64_sys_close+0x86/0x100\n\n  Allocated by task 11:\n   usb_alloc_dev+0x55/0xd90\n   hub_event+0x2524/0x43d0\n\n  Freed by task 769:\n   kfree+0x121/0x360\n   device_release+0xd2/0x280\n   usb_put_dev+0x23/0x30\n   usbdev_release+0x2d8/0x460\n\nRelease the device reference after the drain loop instead. Nothing between\nthe two points requires it to have been dropped."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-04T15:54:28.038Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/0a960b88c5979f853019d4dc4957dfbeeb193440"
        },
        {
          "url": "https://git.kernel.org/stable/c/96f5520fc9a5e4bbf77ac93c9d5ce502f597e6cf"
        },
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          "url": "https://git.kernel.org/stable/c/bd4bffc621a8cb2f4d9ed9b6447415de524a3bef"
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          "url": "https://git.kernel.org/stable/c/b3cde26a66b04f1d90ed0b675899c88b4e49d424"
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        },
        {
          "url": "https://git.kernel.org/stable/c/0dd68b5d01d022fc9c5e71c82a82b0a94d3d0671"
        }
      ],
      "title": "usb: usbfs: fix use-after-free of usb_device in usbdev_release()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80824",
    "datePublished": "2026-09-04T15:54:28.038Z",
    "dateReserved": "2026-08-26T14:34:25.795Z",
    "dateUpdated": "2026-09-04T15:54:28.038Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80824",
      "date": "2026-09-14",
      "epss": "0.00195",
      "percentile": "0.0937"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-06T05:08:13.000Z",
      "cve": "CVE-2026-80824",
      "id": "msrc_CVE-2026-80824",
      "initial_release_date": "2026-09-06T05:08:13.000Z",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "usb: usbfs: fix use-after-free of usb_device in usbdev_release()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80824.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-80824\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-04T16:18:10.233\",\"lastModified\":\"2026-09-04T16:18:10.233\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nusb: usbfs: fix use-after-free of usb_device in usbdev_release()\\n\\nusbdev_release() drops its reference to the struct usb_device before\\ndraining the list of completed async URBs, but that drain path reads back\\nthrough the same object: free_async() calls dec_usb_memory_use_count()\\nfor any URB whose buffer came from the usbfs mmap() region, and its first\\nstatement is bus_to_hcd(ps-\u003edev-\u003ebus).\\n\\nAfter a disconnect the usbfs reference can be the last one, in which case\\nusb_put_dev() frees the device and the subsequent loop reads offset 80 of\\nfreed memory and uses the result as a struct usb_hcd *, which\\nhcd_buffer_free_pages() then dereferences.\\n\\nThis is reachable by an unprivileged process that has read/write access to\\na /dev/bus/usb node: mmap() the fd, submit one URB with a buffer inside the\\nmapping, wait for the device to be unplugged, then munmap() and close().\\nIt reproduces on every attempt rather than being a race, because a live\\nMAP_SHARED vma holds a reference on the struct file, so usbdev_release()\\ncannot run until the last vma is gone and the freeing branch of\\ndec_usb_memory_use_count() is always taken.\\n\\n  BUG: KASAN: slab-use-after-free in dec_usb_memory_use_count+0x3ae/0x410\\n  Read of size 8 at addr ffff8880122ee050 by task poc/769\\n  CPU: 1 UID: 1000 PID: 769 Comm: poc Tainted: G    B    6.12.94 #3\\n\\n  Call Trace:\\n   dec_usb_memory_use_count+0x3ae/0x410\\n   free_async+0x2aa/0x4f0\\n   usbdev_release+0x375/0x460\\n   __fput+0x3ea/0xb50\\n   __x64_sys_close+0x86/0x100\\n\\n  Allocated by task 11:\\n   usb_alloc_dev+0x55/0xd90\\n   hub_event+0x2524/0x43d0\\n\\n  Freed by task 769:\\n   kfree+0x121/0x360\\n   device_release+0xd2/0x280\\n   usb_put_dev+0x23/0x30\\n   usbdev_release+0x2d8/0x460\\n\\nRelease the device reference after the drain loop instead. Nothing between\\nthe two points requires it to have been dropped.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/usb/core/devio.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"f7d34b445abc00e979b7cf36b9580ac3d1a47cd8\",\"lessThan\":\"0a960b88c5979f853019d4dc4957dfbeeb193440\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f7d34b445abc00e979b7cf36b9580ac3d1a47cd8\",\"lessThan\":\"96f5520fc9a5e4bbf77ac93c9d5ce502f597e6cf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f7d34b445abc00e979b7cf36b9580ac3d1a47cd8\",\"lessThan\":\"bd4bffc621a8cb2f4d9ed9b6447415de524a3bef\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f7d34b445abc00e979b7cf36b9580ac3d1a47cd8\",\"lessThan\":\"65879e0a452ca2a234b9475e0c11aff7a4343738\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f7d34b445abc00e979b7cf36b9580ac3d1a47cd8\",\"lessThan\":\"b3cde26a66b04f1d90ed0b675899c88b4e49d424\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f7d34b445abc00e979b7cf36b9580ac3d1a47cd8\",\"lessThan\":\"5f08c45bdcfd28d1171de38c5ef29fc89a76eedc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f7d34b445abc00e979b7cf36b9580ac3d1a47cd8\",\"lessThan\":\"7f0278e474c4d1c4457974ff1137cc385c944ab3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f7d34b445abc00e979b7cf36b9580ac3d1a47cd8\",\"lessThan\":\"47a7f98fbb5006d46d15a3a210ffdc61448a4f19\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f7d34b445abc00e979b7cf36b9580ac3d1a47cd8\",\"lessThan\":\"0dd68b5d01d022fc9c5e71c82a82b0a94d3d0671\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/usb/core/devio.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.6\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.6\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.269\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.220\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.187\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.156\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.108\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.49\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.13\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.3\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0a960b88c5979f853019d4dc4957dfbeeb193440\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/0dd68b5d01d022fc9c5e71c82a82b0a94d3d0671\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/47a7f98fbb5006d46d15a3a210ffdc61448a4f19\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5f08c45bdcfd28d1171de38c5ef29fc89a76eedc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/65879e0a452ca2a234b9475e0c11aff7a4343738\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7f0278e474c4d1c4457974ff1137cc385c944ab3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/96f5520fc9a5e4bbf77ac93c9d5ce502f597e6cf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b3cde26a66b04f1d90ed0b675899c88b4e49d424\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bd4bffc621a8cb2f4d9ed9b6447415de524a3bef\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-08T17:16:48Z",
      "cve": "CVE-2026-80824",
      "id": "CVE-2026-80824",
      "initial_release_date": "2026-09-05T00:26:44Z",
      "product_status:known_affected": "265",
      "product_status:known_not_affected": "88",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80824",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80824.json",
      "version": "3"
    }
  }
}



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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.