Description
In X.Org X server 20.11 through 21.1.16, when a client application uses easystroke for mouse gestures, the main thread modifies various data structures used by the input thread without acquiring a lock, aka a race condition. In particular, AttachDevice in dix/devices.c does not acquire an input lock.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
High
Affected products
- X.Org / X server20.11 – 21.1.16
References
- VENDOR_ADVISORYhttps://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1081338
- MISChttps://gitlab.freedesktop.org/xorg/xserver/-/issues/1260
- VENDOR_ADVISORYhttps://bugs.debian.org/cgi-bin/bugreport.cgi?att=1;bug=1081338;filename=dix-Hold-input-lock-for-AttachDevice.patch;msg=5
- MISChttps://gitlab.freedesktop.org/xorg/xserver/-/commit/dc7cb45482cea6ccec22d117ca0b489500b4d0a0