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CVE-2021-4011

Published: 14 December 2021

A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of-bounds access can occur in the SwapCreateRegister function. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Notes

AuthorNote
mdeslaur
xorg server is actually the xorg-server package
the xorg package only contains docs
xwayland package contains parts of xorg-server
This is ZDI-CAN-14952

Priority

Medium

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
xorg-server
Launchpad, Ubuntu, Debian
bionic
Released (2:1.19.6-1ubuntu4.10)
focal
Released (2:1.20.13-1ubuntu1~20.04.2)
hirsute
Released (2:1.20.11-1ubuntu1.2)
impish
Released (2:1.20.13-1ubuntu1.1)
upstream
Released (21.1.2)
trusty
Released (2:1.15.1-0ubuntu2.11+esm5)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
xenial
Released (2:1.18.4-0ubuntu0.12+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
jammy
Released (2:1.20.13-1ubuntu2)
kinetic
Released (2:1.20.13-1ubuntu2)
lunar
Released (2:1.20.13-1ubuntu2)
Patches:
upstream: https://gitlab.freedesktop.org/xorg/xserver/-/commit/e56f61c79fc3cee26d83cda0f84ae56d5979f768
xorg-server-hwe-16.04
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

trusty Does not exist

upstream Needs triage

xenial
Released (2:1.19.6-1ubuntu4.1~16.04.6+esm5)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
jammy Does not exist

kinetic Does not exist

lunar Does not exist

xorg-server-hwe-18.04
Launchpad, Ubuntu, Debian
bionic
Released (2:1.20.8-2ubuntu2.2~18.04.6)
focal Does not exist

hirsute Does not exist

impish Does not exist

trusty Does not exist

upstream Needs triage

xenial Does not exist

jammy Does not exist

kinetic Does not exist

lunar Does not exist

xwayland
Launchpad, Ubuntu, Debian
bionic Does not exist

focal Does not exist

hirsute
Released (2:21.1.1-0ubuntu1.1)
impish
Released (2:21.1.2-0ubuntu1.1)
trusty Does not exist

xenial Does not exist

upstream
Released (21.1.4)
jammy
Released (2:21.1.3-1ubuntu1)
kinetic
Released (2:21.1.3-1ubuntu1)
lunar
Released (2:21.1.3-1ubuntu1)

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H