CVE-2021-3782
Publication date 30 August 2022
Last updated 24 July 2024
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| wayland | ||
| 22.04 LTS jammy |
Fixed 1.20.0-1ubuntu0.1
|
|
| 20.04 LTS focal |
Fixed 1.18.0-1ubuntu0.1
|
|
| 18.04 LTS bionic |
Fixed 1.16.0-1ubuntu1.1~18.04.4
|
|
| 16.04 LTS xenial |
Fixed 1.12.0-1~ubuntu16.04.3+esm1
|
|
| 14.04 LTS trusty | Ignored end of standard support |
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Get Ubuntu ProSeverity score breakdown
| Parameter | Value |
|---|---|
| Base score |
6.6 · Medium
|
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity impact | Low |
| Availability impact | High |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-5614-1
- Wayland vulnerability
- 15 September 2022
- USN-5614-2
- Wayland vulnerability
- 3 October 2022