Description
An internal reference count is held on the buffer pool, incremented every time a new buffer is created from the pool. The reference count is maintained as an int; on LP64 systems this can cause the reference count to overflow if the client creates a large number of wl_shm buffer objects, or if it can coerce the server to create a large number of external references to the buffer storage. With the reference count overflowing, a use-after-free can be constructed on the wl_shm_pool tracking structure, where values may be incremented or decremented; it may also be possible to construct a limited oracle to leak 4 bytes of server-side memory to the attacking client at a time.
Published: 2022-09-23
Score: 6.6 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
EUVD EUVD EUVD-2021-27046 An internal reference count is held on the buffer pool, incremented every time a new buffer is created from the pool. The reference count is maintained as an int; on LP64 systems this can cause the reference count to overflow if the client creates a large number of wl_shm buffer objects, or if it can coerce the server to create a large number of external references to the buffer storage. With the reference count overflowing, a use-after-free can be constructed on the wl_shm_pool tracking structure, where values may be incremented or decremented; it may also be possible to construct a limited oracle to leak 4 bytes of server-side memory to the attacking client at a time.
Ubuntu USN Ubuntu USN USN-5614-1 Wayland vulnerability
Ubuntu USN Ubuntu USN USN-5614-2 Wayland vulnerability
History

Sun, 13 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.00016}

epss

{'score': 0.00018}


Subscriptions

Redhat Enterprise Linux
Wayland Wayland
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2025-05-22T18:21:26.824Z

Reserved: 2021-09-09T00:00:00.000Z

Link: CVE-2021-3782

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2022-09-23T16:15:10.143

Modified: 2025-05-22T19:15:27.303

Link: CVE-2021-3782

cve-icon Redhat

Severity : Moderate

Publid Date: 2022-07-30T16:05:00Z

Links: CVE-2021-3782 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses