libX11 -- multiple vulnerabilities

X.Org reports: Multiple issues have been found in the X client library implementations published by X.Org for which we are releasing security fixes for. CVE-2026-88806: Out-of-bounds write vulnerability in libX11's XKB X Keyboard Extension action parser CVE-2026-94283: Out-of-bounds read...

[slackware-security] libX11

New libX11 packages are available for Slackware 15.0 and -current to fix security issues. Here are the details from the Slackware 15.0 ChangeLog: patches/packages/libX11-1.8.14-i586-1slack15.0.txz: Upgraded. This update fixes security issues: ximcp: bound XIMOPENREPLY attribute lengths. ximcp:...

RLSA-2026:82015 Important: xorg-x11-server security 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: Privilege escalation via crafted RandR provider property requests...

xorg-x11-server security update

An update is available for xorg-x11-server. This update affects Rocky Linux 9. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from the CVE list X.Org is an open-source implementation of the X Window System. It...

Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : libx11 vulnerabilities (USN-8913-1)

The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8913-1 advisory. Adam Bedard discovered that libx11 incorrectly handled certain XKB keyboard map...

Security update for xorg-x11-server

This update for xorg-x11-server fixes the following issues: CVE-2026-88812: XKB SetGeometry TextDoodad Double Free bsc1281213. CVE-2026-93515: X.Org Server Present Extension Use-After-Free bsc1281218. CVE-2026-93516: X.Org Server XInput Passive Grab Use-After-Free bsc1281220. CVE-2026-93517: GLX...

xorg-x11-server: xwayland: xorg-x11-server: Arbitrary code execution via double-free in XKB geometry handling

A flaw was found in the X.Org X Server and XWayland. An error handling issue in the X Keyboard Extension XKB geometry processing fails to clear a memory pointer after an allocation failure, leading to a double-free condition during cleanup. A local user can exploit this vulnerability by sending a...

ALSA-2026:82015 Important: xorg-x11-server security 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: Privilege escalation via crafted RandR provider property requests...

USN-8913-1 libx11 vulnerabilities

Adam Bedard discovered that libx11 incorrectly handled certain XKB keyboard map replies. If a user were tricked into connecting to a malicious X server, a remote attacker could possibly use this issue to cause libx11 to crash, resulting in a denial of service, or possibly execute arbitrary code...

USN-8913-1: libx11 vulnerabilities

Adam Bedard discovered that libx11 incorrectly handled certain XKB keyboard map replies. If a user were tricked into connecting to a malicious X server, a remote attacker could possibly use this issue to cause libx11 to crash, resulting in a denial of service, or possibly execute arbitrary code...

CVE-2026-88812

A flaw was found in the X.Org X Server and XWayland. An error handling issue in the X Keyboard Extension XKB geometry processing fails to clear a memory pointer after an allocation failure, leading to a double-free condition during cleanup. A local user can exploit this vulnerability by sending a...

CVE-2026-93524

A flaw was found in xorg-x11-server. An authenticated local user can trigger an out-of-bounds heap memory read by sending specially crafted X Keyboard Extension XKB requests with inconsistent key range parameters. This flaw leads to information disclosure, allowing the user to read sensitive data...

CVE-2026-93520

A flaw was found in xorg-x11-server. In the X Keyboard Extension XKB, key name memory is allocated with an insufficient buffer size compared to the maximum supported range. An authenticated local client can exploit this flaw by sending requests that modify the keycode range, triggering a heap-bas...

CVE-2026-93518

A flaw was found in xorg-x11-server. Due to an integer truncation issue during memory allocation calculations within the X Keyboard Extension XKB, the server allocates an undersized buffer when resizing key types. An authenticated local client can exploit this vulnerability by sending specially...

UBUNTU-CVE-2026-88812

XKB SetGeometry TextDoodad Double Free...

UBUNTU-CVE-2026-93524

XKB SetMap Key Width/Action Count Desync Out-Of-Bounds Read...

UBUNTU-CVE-2026-93520

XKB ChangeKeycodeRange Heap Out-of-Bounds Write...

Astra Linux – Vulnerability in xwayland, xorg-server

A flaw was discovered in the X.Org X server’s validation of XKB key type requests. A local attacker could send a specially crafted request to the X server, leading to a vulnerability where out-of-bounds memory access could occur. This could result in the disclosure of sensitive information or cau...

Astra Linux – Vulnerability in xwayland, xorg-server

A flaw was discovered in the X.Org X server. This vulnerability, an out-of-bounds read, affects the handling of XKB X Keyboard Extension modifier maps. An attacker with access to the X11 server can exploit this by sending a malformed request, causing the server to read beyond its intended memory...

Fedora 45 : libX11 (2026-0072911d9d)

The remote Fedora 45 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-0072911d9d advisory. xkb: Check the keysym range in XkbReadKeyActions CVE-2026-88806 Tenable has extracted the preceding description block directly from the Fedora security...