PatchTheCVECVE-2021-3782: An internal reference count is held on the buffer pool, incremented every time a new buffer is created from th
CVE-2021-3782 is a medium-severity flaw (CVSS 6.6) affecting wayland. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.6 (Medium) |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 75%) |
| CISA exploited list | No |
| Weakness | CWE-190 |
| Published | 2022-09-23 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-3782?
wayland: upgrade to 1.20.91. Exact commands for each OS are on this page.
Is CVE-2021-3782 being exploited?
CVE-2021-3782 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-3782 affect?
CVE-2021-3782 affects wayland. Severity is medium (CVSS 6.6). 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
How urgent is CVE-2021-3782?
Priority 34/100. Public exploit reference