Input: uinput - fix circular locking dependency with ff-core
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
CVE-2026-31667
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-31667
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"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"
}
],
"programFiles": [
"drivers/input/misc/uinput.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.19",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.169",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.135",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.82",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.23",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.13",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/input/misc/uinput.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-31667
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #39944 · Revision 1
- Added to Heist Feed
- Publisher date