Red Hat: CVE-2021-3782: libwayland-server wl_shm reference-count overflow (Multiple Advisories)
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.
Solution(s)
- redhat-upgrade-libwayland-client
- redhat-upgrade-libwayland-client-debuginfo
- redhat-upgrade-libwayland-cursor
- redhat-upgrade-libwayland-cursor-debuginfo
- redhat-upgrade-libwayland-egl
- redhat-upgrade-libwayland-egl-debuginfo
- redhat-upgrade-libwayland-server
- redhat-upgrade-libwayland-server-debuginfo
- redhat-upgrade-wayland-debuginfo
- redhat-upgrade-wayland-debugsource
- redhat-upgrade-wayland-devel
- redhat-upgrade-wayland-devel-debuginfo
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