Important: Red Hat Security Advisory: xorg-x11-server security, bug fix, and enhancement update

An update for xorg-x11-server is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerabilit...

xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence()

A use-after-free flaw was found in the X.Org X server and Xwayland in miSyncDestroyFence. A client that sets up multiple fence triggers can trigger a use-after-free function pointer call. An attacker would connect to the X server to set up a fence and await that fence, then a second X connection...

xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX ChangeDrawableAttributes

An out-of-bounds read flaw was found in the X.Org X server and Xwayland in glXDispChangeDrawableAttributes. A wrong size validation check can read a client-controlled number of bytes, exceeding the request buffer, leading to information disclosure. A write path also exists but requires byte-swapp...

Important: Red Hat Security Advisory: xorg-x11-server-Xwayland security, bug fix, and enhancement update

An update for xorg-x11-server-Xwayland is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each...

ALSA-2026:26590 Important: xorg-x11-server-Xwayland security, bug fix, and enhancement update

Xwayland is an X server for running X clients under Wayland. Security Fixes: xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias resolution due to libXfont2 name length mismatch CVE-2026-50256 xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server:...

Important: xorg-x11-server security, bug fix, and enhancement update

X.Org is an open-source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical user interfaces are designed upon. Security Fixes: xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias resolution du...

ALSA-2026:26709 Important: xorg-x11-server security, bug fix, and enhancement update

X.Org is an open-source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical user interfaces are designed upon. Security Fixes: xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias resolution du...

xorg-x11-server security, bug fix, and enhancement update

1.20.11-28.2 - Other security related fixes Resolves: https://redhat.atlassian.net/browse/RHEL-184289 1.20.11-28.1 - CVE fix for: CVE-2026-50256, CVE-2026-50257, CVE-2026-50258, CVE-2026-50259, CVE-2026-50260, CVE-2026-50261, CVE-2026-50262, CVE-2026-50263, CVE-2026-50264 Resolves:...

ALSA-2026:26610 Important: xorg-x11-server security, bug fix, and enhancement update

X.Org is an open-source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical user interfaces are designed upon. Security Fixes: xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias resolution du...

Important: xorg-x11-server-Xwayland security, bug fix, and enhancement update

Xwayland is an X server for running X clients under Wayland. Security Fixes: xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias resolution due to libXfont2 name length mismatch CVE-2026-50256 xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server:...

CVE-2026-50258 affecting package xorg-x11-server-Xwayland for versions less than 24.1.12-1

CVE-2026-50258 affecting package xorg-x11-server-Xwayland for versions less than 24.1.12-1. An upgraded version of the package is available that resolves this issue...

CVE-2026-50257 affecting package xorg-x11-server-Xwayland for versions less than 24.1.12-1

CVE-2026-50257 affecting package xorg-x11-server-Xwayland for versions less than 24.1.12-1. An upgraded version of the package is available that resolves this issue...

CVE-2026-50259 affecting package xorg-x11-server-Xwayland for versions less than 24.1.12-1

CVE-2026-50259 affecting package xorg-x11-server-Xwayland for versions less than 24.1.12-1. An upgraded version of the package is available that resolves this issue...

Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: stack buffer overflow in xkb setmap request via mapwidths indexing

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Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in freecounter()

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Fedora 43 : xorg-x11-server (2026-c3ea7d7b0e)

The remote Fedora 43 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-c3ea7d7b0e advisory. Update to xserver 21.1.23, Security fixes for: ZDI-CAN-30136, ZDI-CAN-30159, ZDI-CAN-30160, ZDI-CAN-30161, ZDI-CAN-30163, ZDI-CAN-30164, ZDI-CAN-30165,...

TencentOS Server 4: xorg-x11-server (TSSA-2026:0294)

The version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2026:0294 advisory. Package updates are available for TencentOS Server 4 that fix the following vulnerabilities...

AZL-89534 CVE-2026-50263 affecting package xorg-x11-server 1.20.10-6

A use-after-free flaw was found in the X.Org X server and Xwayland in CreateSaverWindow. A client can trigger a use-after-free read after changing window attributes and forcing the screen saver, leading to information disclosure...

AZL-89537 CVE-2026-50260 affecting package xorg-x11-server 1.20.10-6

A use-after-free flaw was found in the X.Org X server and Xwayland in FreeCounter. A client that sets up multiple SyncCounters and awaits on those triggers can trigger a use-after-free when destroying those counters via a second client connection. This may be used to crash the server, or for...

AZL-89528 CVE-2026-50262 affecting package xorg-x11-server 1.20.10-6

An out-of-bounds read flaw was found in the X.Org X server and Xwayland in glXDispChangeDrawableAttributes. A wrong size validation check can read a client-controlled number of bytes, exceeding the request buffer, leading to information disclosure. A write path also exists but requires byte-swapp...