CVE-2021-3782 | BDVDB-2026-185231 Detail

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.

Impact#

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Exploit#

History#

1. Version 12022-09-23Record published in the CVE List.
2. Version 22025-05-22Most recent update recorded in the CVE List.