7.7

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2022-49737

CVE-2022-49737: In X.Org X server 20.11 through 21.1.16, when a client application uses easystroke for mouse...

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.

(GitHub Advisory)

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CVE-2022-49737

CVE-2022-49737:

7.7

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

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Root Cause Analysis

The vulnerability description explicitly states that AttachDevice in dix/devices.c does not acquire an input lock, leading to a race condition. I fetched the content of the patch URL provided (https://bugs.debian.org/cgi-bin/bugreport.cgi?att=1;bug=1081338;filename=dix-Hold-input-lock-for-AttachDevice.patch;msg=5). The patch content confirms this by showing the addition of input_lock() and input_unlock() calls within the AttachDevice function. This directly addresses the missing lock, making AttachDevice the primary function that, prior to the patch, contained the vulnerability (lack of proper locking). The stack traces in the patch's commit message further support that AttachDevice's modification of shared data without a lock was conflicting with other threads.

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WAF Rule

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Reasoning

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