CVE-2026-31667 (GCVE-0-2026-31667)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:45 – Updated: 2026-05-11 22:13
VLAI
Title
Input: uinput - fix circular locking dependency with ff-core
Summary
In the Linux kernel, the following vulnerability has been resolved: Input: uinput - fix circular locking dependency with ff-core A lockdep circular locking dependency warning can be triggered reproducibly when using a force-feedback gamepad with uinput (for example, playing ELDEN RING under Wine with a Flydigi Vader 5 controller): ff->mutex -> udev->mutex -> input_mutex -> dev->mutex -> ff->mutex The cycle is caused by four lock acquisition paths: 1. ff upload: input_ff_upload() holds ff->mutex and calls uinput_dev_upload_effect() -> uinput_request_submit() -> uinput_request_send(), which acquires udev->mutex. 2. device create: uinput_ioctl_handler() holds udev->mutex and calls uinput_create_device() -> input_register_device(), which acquires input_mutex. 3. device register: input_register_device() holds input_mutex and calls kbd_connect() -> input_register_handle(), which acquires dev->mutex. 4. evdev release: evdev_release() calls input_flush_device() under dev->mutex, which calls input_ff_flush() acquiring ff->mutex. Fix this by introducing a new state_lock spinlock to protect udev->state and udev->dev access in uinput_request_send() instead of acquiring udev->mutex. The function only needs to atomically check device state and queue an input event into the ring buffer via uinput_dev_event() -- both operations are safe under a spinlock (ktime_get_ts64() and wake_up_interruptible() do not sleep). This breaks the ff->mutex -> udev->mutex link since a spinlock is a leaf in the lock ordering and cannot form cycles with mutexes. To keep state transitions visible to uinput_request_send(), protect writes to udev->state in uinput_create_device() and uinput_destroy_device() with the same state_lock spinlock. Additionally, move init_completion(&request->done) from uinput_request_send() to uinput_request_submit() before uinput_request_reserve_slot(). Once the slot is allocated, uinput_flush_requests() may call complete() on it at any time from the destroy path, so the completion must be initialised before the request becomes visible. Lock ordering after the fix: ff->mutex -> state_lock (spinlock, leaf) udev->mutex -> state_lock (spinlock, leaf) udev->mutex -> input_mutex -> dev->mutex -> ff->mutex (no back-edge)
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
Linux Linux Affected: ff462551235d8d7d843a005950bc90924fcedede , < 71a9729f412e2c692a35c542e14b706fb342927f (git)
Affected: ff462551235d8d7d843a005950bc90924fcedede , < 271ee71a1917b89f6d73ec82dd091c33d92ee617 (git)
Affected: ff462551235d8d7d843a005950bc90924fcedede , < 974f7b138c3a96dd5cd53d1b33409cd7b2229dc6 (git)
Affected: ff462551235d8d7d843a005950bc90924fcedede , < 546c18a14924eb521fe168d916d7ce28f1e13c1d (git)
Affected: ff462551235d8d7d843a005950bc90924fcedede , < a3d6c9c053c9c605651508569230ead633b13f76 (git)
Affected: ff462551235d8d7d843a005950bc90924fcedede , < 1e09dfbb4f5d20ee111f92325a00f85778a5f328 (git)
Affected: ff462551235d8d7d843a005950bc90924fcedede , < 1534661043c434b81cfde26b97a2fb2460329cf0 (git)
Affected: ff462551235d8d7d843a005950bc90924fcedede , < 4cda78d6f8bf2b700529f2fbccb994c3e826d7c2 (git)
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Linux Linux Affected: 2.6.19
Unaffected: 0 , < 2.6.19 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.169 , ≤ 6.1.* (semver)
Unaffected: 6.6.135 , ≤ 6.6.* (semver)
Unaffected: 6.12.82 , ≤ 6.12.* (semver)
Unaffected: 6.18.23 , ≤ 6.18.* (semver)
Unaffected: 6.19.13 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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{
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: uinput - fix circular locking dependency with ff-core\n\nA lockdep circular locking dependency warning can be triggered\nreproducibly when using a force-feedback gamepad with uinput (for\nexample, playing ELDEN RING under Wine with a Flydigi Vader 5\ncontroller):\n\n  ff-\u003emutex -\u003e udev-\u003emutex -\u003e input_mutex -\u003e dev-\u003emutex -\u003e ff-\u003emutex\n\nThe cycle is caused by four lock acquisition paths:\n\n1. ff upload: input_ff_upload() holds ff-\u003emutex and calls\n   uinput_dev_upload_effect() -\u003e uinput_request_submit() -\u003e\n   uinput_request_send(), which acquires udev-\u003emutex.\n\n2. device create: uinput_ioctl_handler() holds udev-\u003emutex and calls\n   uinput_create_device() -\u003e input_register_device(), which acquires\n   input_mutex.\n\n3. device register: input_register_device() holds input_mutex and\n   calls kbd_connect() -\u003e input_register_handle(), which acquires\n   dev-\u003emutex.\n\n4. evdev release: evdev_release() calls input_flush_device() under\n   dev-\u003emutex, which calls input_ff_flush() acquiring ff-\u003emutex.\n\nFix this by introducing a new state_lock spinlock to protect\nudev-\u003estate and udev-\u003edev access in uinput_request_send() instead of\nacquiring udev-\u003emutex.  The function only needs to atomically check\ndevice state and queue an input event into the ring buffer via\nuinput_dev_event() -- both operations are safe under a spinlock\n(ktime_get_ts64() and wake_up_interruptible() do not sleep).  This\nbreaks the ff-\u003emutex -\u003e udev-\u003emutex link since a spinlock is a leaf in\nthe lock ordering and cannot form cycles with mutexes.\n\nTo keep state transitions visible to uinput_request_send(), protect\nwrites to udev-\u003estate in uinput_create_device() and\nuinput_destroy_device() with the same state_lock spinlock.\n\nAdditionally, move init_completion(\u0026request-\u003edone) from\nuinput_request_send() to uinput_request_submit() before\nuinput_request_reserve_slot().  Once the slot is allocated,\nuinput_flush_requests() may call complete() on it at any time from\nthe destroy path, so the completion must be initialised before the\nrequest becomes visible.\n\nLock ordering after the fix:\n\n  ff-\u003emutex -\u003e state_lock (spinlock, leaf)\n  udev-\u003emutex -\u003e state_lock (spinlock, leaf)\n  udev-\u003emutex -\u003e input_mutex -\u003e dev-\u003emutex -\u003e ff-\u003emutex (no back-edge)"
        }
      ],
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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"
          }
        }
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      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:13:16.401Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/71a9729f412e2c692a35c542e14b706fb342927f"
        },
        {
          "url": "https://git.kernel.org/stable/c/271ee71a1917b89f6d73ec82dd091c33d92ee617"
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          "url": "https://git.kernel.org/stable/c/974f7b138c3a96dd5cd53d1b33409cd7b2229dc6"
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          "url": "https://git.kernel.org/stable/c/546c18a14924eb521fe168d916d7ce28f1e13c1d"
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          "url": "https://git.kernel.org/stable/c/1534661043c434b81cfde26b97a2fb2460329cf0"
        },
        {
          "url": "https://git.kernel.org/stable/c/4cda78d6f8bf2b700529f2fbccb994c3e826d7c2"
        }
      ],
      "title": "Input: uinput - fix circular locking dependency with ff-core",
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      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31667",
    "datePublished": "2026-04-24T14:45:15.937Z",
    "dateReserved": "2026-03-09T15:48:24.129Z",
    "dateUpdated": "2026-05-11T22:13:16.401Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-31667",
      "date": "2026-07-20",
      "epss": "0.00096",
      "percentile": "0.00869"
    },
    "microsoft_vex": {
      "current_release_date": "2026-05-01T14:39:19.000Z",
      "cve": "CVE-2026-31667",
      "id": "msrc_CVE-2026-31667",
      "initial_release_date": "2026-04-02T00:00:00.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "3",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Input: uinput - fix circular locking dependency with ff-core",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-31667.json",
      "version": "6"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31667\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-24T15:16:46.390\",\"lastModified\":\"2026-06-17T10:34:11.923\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nInput: uinput - fix circular locking dependency with ff-core\\n\\nA lockdep circular locking dependency warning can be triggered\\nreproducibly when using a force-feedback gamepad with uinput (for\\nexample, playing ELDEN RING under Wine with a Flydigi Vader 5\\ncontroller):\\n\\n  ff-\u003emutex -\u003e udev-\u003emutex -\u003e input_mutex -\u003e dev-\u003emutex -\u003e ff-\u003emutex\\n\\nThe cycle is caused by four lock acquisition paths:\\n\\n1. ff upload: input_ff_upload() holds ff-\u003emutex and calls\\n   uinput_dev_upload_effect() -\u003e uinput_request_submit() -\u003e\\n   uinput_request_send(), which acquires udev-\u003emutex.\\n\\n2. device create: uinput_ioctl_handler() holds udev-\u003emutex and calls\\n   uinput_create_device() -\u003e input_register_device(), which acquires\\n   input_mutex.\\n\\n3. device register: input_register_device() holds input_mutex and\\n   calls kbd_connect() -\u003e input_register_handle(), which acquires\\n   dev-\u003emutex.\\n\\n4. evdev release: evdev_release() calls input_flush_device() under\\n   dev-\u003emutex, which calls input_ff_flush() acquiring ff-\u003emutex.\\n\\nFix this by introducing a new state_lock spinlock to protect\\nudev-\u003estate and udev-\u003edev access in uinput_request_send() instead of\\nacquiring udev-\u003emutex.  The function only needs to atomically check\\ndevice state and queue an input event into the ring buffer via\\nuinput_dev_event() -- both operations are safe under a spinlock\\n(ktime_get_ts64() and wake_up_interruptible() do not sleep).  This\\nbreaks the ff-\u003emutex -\u003e udev-\u003emutex link since a spinlock is a leaf in\\nthe lock ordering and cannot form cycles with mutexes.\\n\\nTo keep state transitions visible to uinput_request_send(), protect\\nwrites to udev-\u003estate in uinput_create_device() and\\nuinput_destroy_device() with the same state_lock spinlock.\\n\\nAdditionally, move init_completion(\u0026request-\u003edone) from\\nuinput_request_send() to uinput_request_submit() before\\nuinput_request_reserve_slot().  Once the slot is allocated,\\nuinput_flush_requests() may call complete() on it at any time from\\nthe destroy path, so the completion must be initialised before the\\nrequest becomes visible.\\n\\nLock ordering after the fix:\\n\\n  ff-\u003emutex -\u003e state_lock (spinlock, leaf)\\n  udev-\u003emutex -\u003e state_lock (spinlock, leaf)\\n  udev-\u003emutex -\u003e input_mutex -\u003e dev-\u003emutex -\u003e ff-\u003emutex (no back-edge)\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/input/misc/uinput.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ff462551235d8d7d843a005950bc90924fcedede\",\"lessThan\":\"71a9729f412e2c692a35c542e14b706fb342927f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ff462551235d8d7d843a005950bc90924fcedede\",\"lessThan\":\"271ee71a1917b89f6d73ec82dd091c33d92ee617\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ff462551235d8d7d843a005950bc90924fcedede\",\"lessThan\":\"974f7b138c3a96dd5cd53d1b33409cd7b2229dc6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ff462551235d8d7d843a005950bc90924fcedede\",\"lessThan\":\"546c18a14924eb521fe168d916d7ce28f1e13c1d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ff462551235d8d7d843a005950bc90924fcedede\",\"lessThan\":\"a3d6c9c053c9c605651508569230ead633b13f76\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ff462551235d8d7d843a005950bc90924fcedede\",\"lessThan\":\"1e09dfbb4f5d20ee111f92325a00f85778a5f328\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ff462551235d8d7d843a005950bc90924fcedede\",\"lessThan\":\"1534661043c434b81cfde26b97a2fb2460329cf0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ff462551235d8d7d843a005950bc90924fcedede\",\"lessThan\":\"4cda78d6f8bf2b700529f2fbccb994c3e826d7c2\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/input/misc/uinput.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.19\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.19\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.253\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.203\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.169\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.135\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.82\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.23\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.13\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"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}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-667\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.19.1\",\"versionEndExcluding\":\"5.10.253\",\"matchCriteriaId\":\"59C4CD77-5444-4760-B0D8-F238740397B4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.203\",\"matchCriteriaId\":\"20DDB3E9-AABF-4107-ADB0-5362AA067045\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.169\",\"matchCriteriaId\":\"DBEC0E5D-641C-4E98-A6D9-5799B10CE451\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.135\",\"matchCriteriaId\":\"15C1A1B2-14EE-494C-AF3E-D5A7BA640B39\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.82\",\"matchCriteriaId\":\"02904CAE-71D2-45B3-9EC3-F6A9D18B6307\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.23\",\"matchCriteriaId\":\"E9E09FDD-9EE3-4A56-92E2-2B30AFD0072F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-02T17:15:03+00:00",
      "cve": "CVE-2026-31667",
      "id": "CVE-2026-31667",
      "initial_release_date": "2026-04-24T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Input: uinput - fix circular locking dependency with ff-core",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31667.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-06-19T01:54:17Z",
      "cve": "CVE-2026-31667",
      "id": "CVE-2026-31667",
      "initial_release_date": "2026-04-25T01:36:34Z",
      "product_status:known_affected": "203",
      "product_status:known_not_affected": "82",
      "product_status:recommended": "23",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31667",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31667.json",
      "version": "7"
    }
  }
}



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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.