CVE-2026-109904

X.Org Server XRes QueryClientIds Request Size Overflow

A buffer overread caused by an integer-overflow in Proc/SProcXResQueryClientIds in X.Org xwayland before 24.1.15 and X Server before 21.1.26 could be used by attackers on authenticated X clients to crash the server or leak out information.

CVSS 4.0 · 6.9 Medium EPSS n/a KEV · Not listed

Vendors

X.org

Products

Xorg-x11-server Xwayland

CVE-2026-93519

X.Org Server XFixes Pointer Barrier Event List Buffer Overflow

A buffer overflow when handling pointer barriers in the XFIXES extension in X.Org X server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in X server context.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed

Vendors

X.org X.orgg

Products

X Server Xorg-x11-server Xwayland

CVE-2026-93521

X.Org Server RandR ChangeProviderProperty Heap Buffer Overflow

A buffer overflow in RandR ChangeProviderProperty requests in X.Org X Server before 2.1.25 and XWayland before 24.4.14 could be used by authenticated X clients to crash or execute code within the X server context.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed

Vendors

X.org

Products

X Server Xorg-x11-server Xwayland

CVE-2023-43787

Libx11: integer overflow in xcreateimage() leading to a heap overflow

A vulnerability was found in libX11 due to an integer overflow within the XCreateImage() function. This flaw allows a local user to trigger an integer overflow and execute arbitrary code with elevated privileges.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed

Vendors

Fedoraproject Redhat X.org

Products

Fedora Enterprise Linux Rhel Els and 1 more

CVE-2023-43785

Libx11: out-of-bounds memory access in _xkbreadkeysyms()

A vulnerability was found in libX11 due to a boundary condition within the _XkbReadKeySyms() function. This flaw allows a local user to trigger an out-of-bounds read error and read the contents of memory on the system.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Fedoraproject Redhat X.org

Products

Fedora Enterprise Linux Rhel Els and 1 more

CVE-2023-43786

Libx11: stack exhaustion from infinite recursion in putsubimage()

A vulnerability was found in libX11 due to an infinite loop within the PutSubImage() function. This flaw allows a local user to consume all available system resources and cause a denial of service condition.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed

Vendors

Fedoraproject Redhat X.org

Products

Fedora Enterprise Linux Rhel Els and 1 more

CVE-2026-93523

X.Org Server XInput2 PassiveUngrabDevice Out-of-Bounds Write

A heap buffer overflow caused by a XIPassiveUngrabDevice request with an out-of-range modifier value in X.Org X Server before 21.1.15 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in X server context.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed

Vendors

X.org

Products

X Server Xorg-x11-server Xwayland

CVE-2026-93520

X.Org Server XKB ChangeKeycodeRange Heap Out-of-Bounds Write

A heap buffer overflow caused by mismatching size calculations between XkbAllocNames and ChangeKeycodeRange in X.org X server before 2.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in X server context.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed

Vendors

X.org

Products

Xorg-server Xorg-x11-server Xwayland

CVE-2023-43788

Libxpm: out of bounds read in xpmcreatexpmimagefrombuffer()

A vulnerability was found in libXpm due to a boundary condition within the XpmCreateXpmImageFromBuffer() function. This flaw allows a local attacker to trigger an out-of-bounds read error and read the contents of memory on the system.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed

Vendors

Fedoraproject Redhat X.org

Products

Fedora Enterprise Linux Rhel Els and 1 more

CVE-2026-93536

X.Org Server GestureBuildSprite Use-After-Free

A use after free caused by missing lifecycle management of gesture sprites in GestureBuildSprite() in X.Org X Server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to crash the X server or potentially execute code.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed

Vendors

X.org

Products

X Server Xorg-x11-server Xwayland

CVE-2026-93524

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

A buffer overread in CheckKeySyms() in X.Org X Server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to leak small amounts of information from X server memory or potentially crash the X server.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed

Vendors

X.org

Products

X Server Xorg-x11-server Xwayland

CVE-2026-93516

.Org Server XInput Passive Grab Use-After-Free

A use-after-free caused by lack of lifecycle management when adding / removing XInput master devices in X.org X Server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X Clients to crash the X server or potentially execute code in X server context.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed

Vendors

X.org

Products

X Server Xorg-x11-server Xwayland

CVE-2026-93515

.Org Server Present Extension Use-After-Free

A use-after-free in present_clear_window_notifies() in the X.org X Server before 21.1.25 and X Wayland before 24.1.14 could be used by malicious X clients to crash or potentially execute code in the X server context.

CVSS 4.0 · 6.8 Medium EPSS < 1% KEV · Not listed

Vendors

X.org

Products

X Server Xorg-x11-server Xwayland

CVE-2026-50263

Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free information disclosure in createsaverwindow()

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.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat X.org

Products

Enterprise Linux Enterprise Linux Eus Rhel Aus and 7 more

CVE-2026-50262

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 __glXDisp_ChangeDrawableAttributes(). 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-swapped clients which is disabled by default.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat X.org

Products

Enterprise Linux Enterprise Linux Eus Rhel Aus and 8 more

CVE-2026-34002

Xorg: xwayland: x.org x server: information disclosure or denial of service via out-of-bounds read in xkb modifier map handling

A flaw was found in the X.Org X server. This vulnerability, an out-of-bounds read, affects the XKB (X Keyboard Extension) modifier map handling. An attacker with access to the X11 server can exploit this by sending a malformed request, which causes the server to read beyond its intended memory boundaries. This can lead to the exposure of sensitive information or cause the server to crash, resulting in a denial of service.

CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat X.org

Products

Enterprise Linux Enterprise Linux Eus Rhel Aus and 6 more

CVE-2026-34000

Xwayland: xorg: x.org x server: information disclosure and denial of service via out-of-bounds read in xkb geometry processing.

A flaw was found in the X.Org X server. This out-of-bounds read vulnerability in the XKB geometry processing, specifically within the `CheckSetGeom()` and `XkbAddGeomKeyAlias` functions, allows an attacker to read uninitialized or out-of-bounds memory. An attacker with a connection to the X11 server, either locally or remotely, can exploit this without user interaction. This could lead to the disclosure of memory contents or cause a denial of service by crashing the server.

CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat X.org

Products

Enterprise Linux Enterprise Linux Eus Rhel Aus and 7 more

CVE-2026-93522

X.Org Server Glamor CopyArea Heap Buffer Overflow

A heap buffer overflow caused by mismatched size usage in CopyArea CPU-to-FBO path in X.Org X Server before 21.1.15 and XWayland before 24.1.14 could be used by authenticated X clients to crash or potentially execute code in the X server context.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed

Vendors

X.org

Products

Xorg-x11-server Xwayland

CVE-2026-93518

X.Org Server XKB ResizeKeyType Numeric Truncation

An integer truncation issue in XkbResizeKeyType() that could lead to a heap buffer overflow by authenticated X clients in X.org X server before 21.1.25 and XWayland before 24.1.14 could be exploited for crashes or potential code execution in the X server.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed

Vendors

X.org

Products

Xorg-server Xorg-x11-server Xwayland

CVE-2026-93517

X.Org Server GLX RenderLarge Heap Buffer Overflow

A heap buffer overflow in handling GLX RenderLarge request where dataBytes exceeds cmdlen in X.org X server before 21.1.25 and XWayland before 24.1.14 that could be be triggered by an authenticated X client could cause crashes or code execution in X server context.

CVSS 4.0 · 8.5 High EPSS < 1% KEV · Not listed

Vendors

X.org X.orgg

Products

X Server Xwayland Xorg-x11-server