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CVE-2021-3782

Status Candidate

Overview

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.

Related Files

Red Hat Security Advisory 2023-3813-01
Posted Jun 28, 2023
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2023-3813-01 - An update for mtr-operator-bundle-container, mtr-operator-container, mtr-web-container, and mtr-web-executor-container is now available for Migration Toolkit for Runtimes 1 on RHEL 8.

tags | advisory, web
systems | linux, redhat
advisories | CVE-2021-3782, CVE-2022-36227, CVE-2022-3627, CVE-2022-3970, CVE-2022-4492, CVE-2023-0361, CVE-2023-2491, CVE-2023-27535
SHA-256 | 4a6085b8018ab9119a04178776c94e000071d542fb3b2c381d6905231da0cdc1
Red Hat Security Advisory 2023-3664-01
Posted Jun 19, 2023
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2023-3664-01 - Release of Security Advisory for the OpenShift Jenkins image and Jenkins agent base image.

tags | advisory
systems | linux, redhat
advisories | CVE-2021-3782, CVE-2021-46848, CVE-2022-1304, CVE-2022-1705, CVE-2022-2795, CVE-2022-28327, CVE-2022-2880, CVE-2022-32148, CVE-2022-35737, CVE-2022-36227, CVE-2022-3627, CVE-2022-3970, CVE-2022-41715, CVE-2022-41717
SHA-256 | dd336c3e2dc2db105e105127e1f2bbf79335a56f544ed3b31f07727c470cb571
Red Hat Security Advisory 2023-2786-01
Posted May 16, 2023
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2023-2786-01 - Wayland is a protocol for a compositor to talk to its clients, as well as a C library implementation of that protocol. The compositor can be a standalone display server running on Linux kernel modesetting and evdev input devices, an X application, or a wayland client itself. The clients can be traditional applications, X servers or other display servers.

tags | advisory, kernel, protocol
systems | linux, redhat
advisories | CVE-2021-3782
SHA-256 | 376d6fcd00cecb782d135719b7baa66bd171461ef415c9123fc82377a08d66c3
Ubuntu Security Notice USN-5614-2
Posted Oct 4, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5614-2 - USN-5614-1 fixed a vulnerability in Wayland. This update provides the corresponding update for Ubuntu 16.04 ESM. It was discovered that Wayland incorrectly handled reference counting certain objects. An attacker could use this issue to cause Wayland to crash, resulting in a denial of service, or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2021-3782
SHA-256 | 10e730b3dc2565c7df75f5b8c7912171f93bac717141d6b3dac8f64898adb02f
Ubuntu Security Notice USN-5614-1
Posted Sep 16, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5614-1 - It was discovered that Wayland incorrectly handled reference counting certain objects. An attacker could use this issue to cause Wayland to crash, resulting in a denial of service, or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2021-3782
SHA-256 | bb11f2b39f39d3efa6b1b372c101161078bd4937bfbf50baa0a65f2cf890229f
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