CVE-2021-3782

Public on 2022-09-23
Modified on 2024-02-12
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.
Severity
Medium severity
Medium
CVSS v3 Base Score
6.6
See breakdown

Affected Packages

Platform Package Release Date Advisory Status
Amazon Linux 2 - Core wayland 2023-06-21 ALAS2-2023-2103 Fixed
Amazon Linux 2023 wayland 2023-06-05 ALAS2023-2023-203 Fixed

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 6.6 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L
NVD CVSSv3 6.6 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H