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.
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Remediation
No vendor fix or workaround currently provided.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
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Advisories
| Source | ID | Title |
|---|---|---|
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 |
USN-5614-1 | Wayland vulnerability |
Ubuntu USN |
USN-5614-2 | Wayland vulnerability |
References
History
Sun, 13 Jul 2025 13:45:00 +0000
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Status: PUBLISHED
Assigner: redhat
Published:
Updated: 2025-05-22T18:21:26.824Z
Reserved: 2021-09-09T00:00:00.000Z
Link: CVE-2021-3782
No data.
Status : Modified
Published: 2022-09-23T16:15:10.143
Modified: 2025-05-22T19:15:27.303
Link: CVE-2021-3782
OpenCVE Enrichment
No data.
EUVD
Ubuntu USN