MEDIUM 6.6 Microsoft

CVE-2021-3782

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.

Microsoft Security Update 2022-Sep: 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.

Affected Products

References

Published: 2022-09-13 · Source: Microsoft · Feed updated: 2026-08-14
This medium severity vulnerability with a CVSS score of 6.6 was published on 2022-09-13 via Microsoft. Affected: cm1 wayland 1.21.0-1 on CBL Mariner 1.0, cbl2 wayland 1.21.0-1 on CBL Mariner 2.0.
vulnfeed aggregates 10939 vulnerabilities from NVD, CISA KEV, Ubuntu, Debian, Red Hat, Kubernetes, Exploit-DB, OSS-Security, GitHub and OpenStack — updated every 4 hours.