CVEvulnerability

CVE-2021-3782

6.6 MEDIUM Published 2022-09-23 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2022-09-23
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
6.6 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
6.6 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
Weaknesses
CWE-190

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.

Affected configurations

• wayland wayland (< 1.20.91)

Related

Weakness · CWE (1)

  • CWE-190 Integer Overflow or Wraparound weakness

References