UBUNTU-CVE-2021-3782

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UBUNTU-CVE-2021-3782

Summary:

Details: 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.

References: https://ubuntu.com/security/CVE-2021-3782, https://access.redhat.com/security/cve/CVE-2021-3782, https://ubuntu.com/security/notices/USN-5614-1, https://ubuntu.com/security/notices/USN-5614-2, https://www.cve.org/CVERecord?id=CVE-2021-3782