{"id":"JLSEC-2026-97","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.","modified":"2026-07-25T18:24:56.589499530Z","published":"2026-04-14T12:58:25.609Z","upstream":["CVE-2021-3782"],"database_specific":{"license":"CC-BY-4.0","sources":[{"published":"2022-09-23T16:15:10.143Z","url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2021-3782","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3782","database_specific":{"status":"Modified"},"id":"CVE-2021-3782","imported":"2026-07-17T22:42:06.046Z","modified":"2026-06-17T04:05:45.153Z"}]},"references":[{"type":"WEB","url":"https://gitlab.freedesktop.org/wayland/wayland/-/issues/224"}],"affected":[{"package":{"name":"Wayland_jll","ecosystem":"Julia","purl":"pkg:julia/Wayland_jll?uuid=a2964d1f-97da-50d4-b82a-358c7fce9d89"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.21.0+0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-97.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H"}]}