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CVE-2026-72483 (GCVE-0-2026-72483)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:57 – Updated: 2026-08-17 05:44
VLAI
Title
usb: host: max3421: Fix shift-out-of-bounds in max3421_hub_control()
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: host: max3421: Fix shift-out-of-bounds in max3421_hub_control() The `max3421_hub_control()` function handles USB hub class requests to the virtual root hub. In the `default` branches of both the `ClearPortFeature` and `SetPortFeature` switch statements, it modifies `max3421_hcd->port_status` by left shifting 1 by the request's `value` parameter. However, it does not validate whether this shift will exceed the width of `port_status`. So if a malicious userspace task with access to the root hub via /dev/bus/usb/.../001 issues a USBDEVFS_CONTROL ioctl with `wValue` greater than or equal to 32, the left shift operation invokes shift-out-of-bounds undefined behavior. This results in arbitrary bit corruption of `port_status`, including the normally-immutable change bits, which can bypass internal state checks and confuse the hub status. Fix this by rejecting requests whose `value` exceeds the shift width before performing the shift. This issue was found using a KLEE-based symbolic execution tool for kernel drivers that I'm currently developing.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 2d53139f31626bad6f8983d8e519ddde2cbba921 , < e5fa9d8f40746ec3447335c9642c03410f5fd3af (git)
Affected: 2d53139f31626bad6f8983d8e519ddde2cbba921 , < 08b1d4cab0230697bc74c63fc4e40170a7559c54 (git)
Affected: 2d53139f31626bad6f8983d8e519ddde2cbba921 , < 3be5f24e8270ba53b3c814d13689bb8644c86237 (git)
Affected: 2d53139f31626bad6f8983d8e519ddde2cbba921 , < d512bdefd241b98f4d7bcb5bab5614a86411fad4 (git)
Affected: 2d53139f31626bad6f8983d8e519ddde2cbba921 , < 00dd025324b56d39d37e57a08f473dab3a660f30 (git)
Affected: 2d53139f31626bad6f8983d8e519ddde2cbba921 , < 02d03c61e8a7b016956acb48e8a2512d16d87517 (git)
Affected: 2d53139f31626bad6f8983d8e519ddde2cbba921 , < 4da073d57176d8e1c2bca34febfbc81d2560c1a5 (git)
Affected: 2d53139f31626bad6f8983d8e519ddde2cbba921 , < cff06b03b530ae1fe8a13e93a7848f2130e00fb4 (git)
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Linux Linux Affected: 3.16
Unaffected: 0 , < 3.16 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: host: max3421: Fix shift-out-of-bounds in max3421_hub_control()\n\nThe `max3421_hub_control()` function handles USB hub class requests\nto the virtual root hub. In the `default` branches of both the\n`ClearPortFeature` and `SetPortFeature` switch statements, it modifies\n`max3421_hcd-\u003eport_status` by left shifting 1 by the request\u0027s `value`\nparameter. However, it does not validate whether this shift will exceed\nthe width of `port_status`.\n\nSo if a malicious userspace task with access to the root hub via\n/dev/bus/usb/.../001 issues a USBDEVFS_CONTROL ioctl with `wValue`\ngreater than or equal to 32, the left shift operation invokes\nshift-out-of-bounds undefined behavior. This results in arbitrary\nbit corruption of `port_status`, including the normally-immutable\nchange bits, which can bypass internal state checks and confuse the\nhub status.\n\nFix this by rejecting requests whose `value` exceeds the shift width\nbefore performing the shift.\n\nThis issue was found using a KLEE-based symbolic execution tool for\nkernel drivers that I\u0027m currently developing."
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached when a local process issues USBDEVFS_CONTROL on the MAX3421 root hub (/dev/bus/usb/BBB/001); usb_submit_urb() routes ep0 control transfers through rh_call_control() to max3421_hub_control(), with no network or remote protocol path.\nAC:L - The attacker fully controls the hub-class wValue field in the ioctl and can reliably trigger the shift-out-of-bounds by sending SetPortFeature or ClearPortFeature with wValue\u003e=32; no race, timing, or memory-layout conditions outside the attacker\u0027s control are required.\nPR:L - Only a basic unprivileged local account is needed: desktop, kiosk, and embedded MAX3421 deployments grant USB bus device-node access via udev uaccess/ACL or plugdev, and check_ctrlrecip() imposes no extra capability check for hub-class (USB_RECIP_OTHER) root-hub requests.\nUI:N - Exploitation is self-contained in the attacker\u0027s own process issuing the crafted USBDEVFS_CONTROL ioctl; no separate victim action, mount, or file open by another user is required.\nS:U - The undefined-behavior shift corrupts only the MAX3421 driver\u0027s port_status state inside kernel memory under the same security authority; it does not cross a VM, IOMMU, or sandbox boundary.\nC:H - Shift-out-of-bounds on port_status is kernel memory corruption of a security-relevant hub state word; corrupted status (including normally kernel-only change bits) is returned to userspace via GetPortStatus, enabling information disclosure from corrupted kernel state.\nI:H - The unchecked shift allows arbitrary bit manipulation of port_status, including normally immutable change bits, bypassing the USB_PORT_STAT_POWER gate that guards SetPortFeature updates and corrupting hub state that drives VBUS control and port reset logic.\nA:H - Shift-out-of-bounds is undefined behavior that can trap under UBSAN/KASAN or panic_on_warn, and corrupting port_status can confuse hub status polling, suspend/resume, and port-reset handling, causing USB host failure or kernel hang on embedded MAX3421 systems."
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      "title": "usb: host: max3421: Fix shift-out-of-bounds in max3421_hub_control()",
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    "datePublished": "2026-08-15T05:57:20.914Z",
    "dateReserved": "2026-08-09T03:40:39.935Z",
    "dateUpdated": "2026-08-17T05:44:46.745Z",
    "state": "PUBLISHED"
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However, it does not validate whether this shift will exceed\\nthe width of `port_status`.\\n\\nSo if a malicious userspace task with access to the root hub via\\n/dev/bus/usb/.../001 issues a USBDEVFS_CONTROL ioctl with `wValue`\\ngreater than or equal to 32, the left shift operation invokes\\nshift-out-of-bounds undefined behavior. This results in arbitrary\\nbit corruption of `port_status`, including the normally-immutable\\nchange bits, which can bypass internal state checks and confuse the\\nhub status.\\n\\nFix this by rejecting requests whose `value` exceeds the shift width\\nbefore performing the shift.\\n\\nThis issue was found using a KLEE-based symbolic execution tool for\\nkernel drivers that I\u0027m currently developing.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/usb/host/max3421-hcd.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2d53139f31626bad6f8983d8e519ddde2cbba921\",\"lessThan\":\"e5fa9d8f40746ec3447335c9642c03410f5fd3af\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2d53139f31626bad6f8983d8e519ddde2cbba921\",\"lessThan\":\"08b1d4cab0230697bc74c63fc4e40170a7559c54\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2d53139f31626bad6f8983d8e519ddde2cbba921\",\"lessThan\":\"3be5f24e8270ba53b3c814d13689bb8644c86237\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2d53139f31626bad6f8983d8e519ddde2cbba921\",\"lessThan\":\"d512bdefd241b98f4d7bcb5bab5614a86411fad4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2d53139f31626bad6f8983d8e519ddde2cbba921\",\"lessThan\":\"00dd025324b56d39d37e57a08f473dab3a660f30\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2d53139f31626bad6f8983d8e519ddde2cbba921\",\"lessThan\":\"02d03c61e8a7b016956acb48e8a2512d16d87517\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2d53139f31626bad6f8983d8e519ddde2cbba921\",\"lessThan\":\"4da073d57176d8e1c2bca34febfbc81d2560c1a5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2d53139f31626bad6f8983d8e519ddde2cbba921\",\"lessThan\":\"cff06b03b530ae1fe8a13e93a7848f2130e00fb4\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/usb/host/max3421-hcd.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/00dd025324b56d39d37e57a08f473dab3a660f30\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/02d03c61e8a7b016956acb48e8a2512d16d87517\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/08b1d4cab0230697bc74c63fc4e40170a7559c54\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3be5f24e8270ba53b3c814d13689bb8644c86237\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4da073d57176d8e1c2bca34febfbc81d2560c1a5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cff06b03b530ae1fe8a13e93a7848f2130e00fb4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d512bdefd241b98f4d7bcb5bab5614a86411fad4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e5fa9d8f40746ec3447335c9642c03410f5fd3af\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T16:07:01+00:00",
      "cve": "CVE-2026-72483",
      "id": "CVE-2026-72483",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: usb: host: max3421: Fix shift-out-of-bounds in max3421_hub_control()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72483.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.

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  • 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.
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  • 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.