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CVE-2026-89733 (GCVE-0-2026-89733)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:46 – Updated: 2026-09-14 12:02
VLAI
Title
usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind()
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind() In uvc_function_bind() error path, we use usb_ep_free_request which uses uvc->control_req but does not set it to NULL afterwards. Thus, uvc->control_req is a dangling pointer causing a UAF. Also we do not set the uvc->control_buf pointer to NULL after freeing it, which is another dangling pointer. Fix it by setting uvc->control_req to NULL after we run usb_ep_free_request() and uvc->control_buf to NULL after kfree. Do the same for uvc_function_unbind().
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: 0f9df939385527049c8062a099fbfa1479fe7ce0 , < ddb1b0d5d858584ed0d3a5aaa042ee693998c7e2 (git)
Affected: 0f9df939385527049c8062a099fbfa1479fe7ce0 , < 85dd5e8bd6776d02854f2847d83429f1f712e99c (git)
Affected: 0f9df939385527049c8062a099fbfa1479fe7ce0 , < 502a7f5b79b7ba751988789e982924f8f496129f (git)
Affected: 0f9df939385527049c8062a099fbfa1479fe7ce0 , < bec7708eb3b5295d12e931db24381b7c94c72953 (git)
Affected: 0f9df939385527049c8062a099fbfa1479fe7ce0 , < 8e88ed8a374de67270d38689f2a81018909cafbb (git)
Affected: 0f9df939385527049c8062a099fbfa1479fe7ce0 , < 9897b7da8c0ad8356c1b8649379fcb5a689462cb (git)
Affected: 0f9df939385527049c8062a099fbfa1479fe7ce0 , < 38f822ddce9355893d734279a26ddec45182197e (git)
Affected: 0f9df939385527049c8062a099fbfa1479fe7ce0 , < bdab5605259ba5d6ff927c1a85cc83eb3ecfdacc (git)
Affected: 1efa8a5aac93d9e67075995d7d4902b57ce184f7 (git)
Affected: e7a4b0efe62e56a0acc81d16091c6efc2a282be8 (git)
Affected: 065f5561a20659cf17aae5f72b32b5c2695c8e00 (git)
Affected: 3.2.36 , < 3.3 (semver)
Affected: 3.4.25 , < 3.5 (semver)
Affected: 3.7.2 , < 3.8 (semver)
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Linux Linux Affected: 3.8
Unaffected: 0 , < 3.8 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind()\n\nIn uvc_function_bind() error path, we use usb_ep_free_request which\nuses uvc-\u003econtrol_req but does not set it to NULL afterwards. Thus,\nuvc-\u003econtrol_req is a dangling pointer causing a UAF. Also we do not set\nthe uvc-\u003econtrol_buf pointer to NULL after freeing it, which is another\ndangling pointer. Fix it by setting uvc-\u003econtrol_req to NULL after we run\nusb_ep_free_request() and uvc-\u003econtrol_buf to NULL after kfree. Do the\nsame for uvc_function_unbind()."
        }
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        {
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            "version": "3.1"
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              "value": "AV:L - The UAF is reached by local writes to /sys/kernel/config/usb_gadget/\u003cg\u003e/UDC that drive uvc_function_bind()/uvc_function_unbind(); no USB host traffic or physical attachment is required, matching prior gadget bind dangling-pointer scores and being higher severity than Physical.\nAC:L - The attacker controls the successful bind, the unbind that leaves uvc-\u003econtrol_req dangling, and a later bind that fails before reallocating (e.g. exhausting usb_ep_autoconfig(), as in the syzkaller \"Unable to allocate streaming EP\" crash), so the error path double-frees the usb_request with no race.\nPR:L - gadget_dev_desc_UDC_store() and uvc_function_bind() perform no capability check; access is gated only by configfs permissions, and Android/embedded USB gadget HALs routinely delegate /sys/kernel/config/usb_gadget to non-root system or daemon accounts.\nUI:N - The attacker performs the configfs UDC bind/unbind writes themselves; no victim action, cable plug, or other-user interaction is required.\nS:U - The dangling usb_request double-free corrupts kernel heap within the same kernel security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - usb_ep_free_request() on the stale control_req is a use-after-free of a usb_request slab object; an attacker who sprays that cache controls the freed object and can convert the UAF into kernel memory disclosure.\nI:H - The same stale pointer is a double-free through ep-\u003eops-\u003efree_request, yielding classic heap-corruption primitives (object overlap and arbitrary free) that can be leveraged into arbitrary write and control-flow hijack.\nA:H - The syzkaller report is a KASAN slab-use-after-free oops in usb_ep_free_request() on the bind error path, and the double free independently panics the kernel, which the attacker can retrigger via configfs."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/ddb1b0d5d858584ed0d3a5aaa042ee693998c7e2"
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        {
          "url": "https://git.kernel.org/stable/c/85dd5e8bd6776d02854f2847d83429f1f712e99c"
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      "title": "usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89733",
    "datePublished": "2026-09-11T19:46:42.613Z",
    "dateReserved": "2026-09-11T19:38:34.760Z",
    "dateUpdated": "2026-09-14T12:02:21.384Z",
    "state": "PUBLISHED"
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      "date": "2026-09-15",
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Do the\\nsame for uvc_function_unbind().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/usb/gadget/function/f_uvc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"0f9df939385527049c8062a099fbfa1479fe7ce0\",\"lessThan\":\"ddb1b0d5d858584ed0d3a5aaa042ee693998c7e2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0f9df939385527049c8062a099fbfa1479fe7ce0\",\"lessThan\":\"85dd5e8bd6776d02854f2847d83429f1f712e99c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0f9df939385527049c8062a099fbfa1479fe7ce0\",\"lessThan\":\"502a7f5b79b7ba751988789e982924f8f496129f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0f9df939385527049c8062a099fbfa1479fe7ce0\",\"lessThan\":\"bec7708eb3b5295d12e931db24381b7c94c72953\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0f9df939385527049c8062a099fbfa1479fe7ce0\",\"lessThan\":\"8e88ed8a374de67270d38689f2a81018909cafbb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0f9df939385527049c8062a099fbfa1479fe7ce0\",\"lessThan\":\"9897b7da8c0ad8356c1b8649379fcb5a689462cb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0f9df939385527049c8062a099fbfa1479fe7ce0\",\"lessThan\":\"38f822ddce9355893d734279a26ddec45182197e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0f9df939385527049c8062a099fbfa1479fe7ce0\",\"lessThan\":\"bdab5605259ba5d6ff927c1a85cc83eb3ecfdacc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1efa8a5aac93d9e67075995d7d4902b57ce184f7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e7a4b0efe62e56a0acc81d16091c6efc2a282be8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"065f5561a20659cf17aae5f72b32b5c2695c8e00\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3.2.36\",\"lessThan\":\"3.3\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"3.4.25\",\"lessThan\":\"3.5\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"3.7.2\",\"lessThan\":\"3.8\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/usb/gadget/function/f_uvc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.8\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.8\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.270\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.109\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"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/38f822ddce9355893d734279a26ddec45182197e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/502a7f5b79b7ba751988789e982924f8f496129f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/85dd5e8bd6776d02854f2847d83429f1f712e99c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8e88ed8a374de67270d38689f2a81018909cafbb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9897b7da8c0ad8356c1b8649379fcb5a689462cb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bdab5605259ba5d6ff927c1a85cc83eb3ecfdacc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bec7708eb3b5295d12e931db24381b7c94c72953\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ddb1b0d5d858584ed0d3a5aaa042ee693998c7e2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-13T06:47:41+00:00",
      "cve": "CVE-2026-89733",
      "id": "CVE-2026-89733",
      "initial_release_date": "2026-09-11T19:46:42.613000+00:00",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: USB UVC gadget driver use-after-free vulnerability",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89733.json",
      "version": "3"
    }
  }
}



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Taxonomy of the tags.





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.