X.Org Xwayland vulnerabilities

CVE-2023-1393 [HIGH] CVE-2023-1393: A flaw was found in X A flaw was found in X.Org Server Overlay Window. A Use-After-Free may lead to local privilege escalation. If a client explicitly destroys the compositor overlay window (aka COW), the Xserver would leave a dangling pointer to that window in the CompScreen structure, which will trigger a use-after-free later.

CVE-2022-46341 [HIGH] CVE-2022-46341: A vulnerability was found in X A vulnerability was found in X.Org. This security flaw occurs because the handler for the XIPassiveUngrab request accesses out-of-bounds memory when invoked with a high keycode or button code. This issue can lead to local privileges elevation on systems where the X server is running privileged and remote code execution for ssh X forwarding sessions.

CVE-2022-46340 [HIGH] CVE-2022-46340: A vulnerability was found in X A vulnerability was found in X.Org. This security flaw occurs becuase the swap handler for the XTestFakeInput request of the XTest extension may corrupt the stack if GenericEvents with lengths larger than 32 bytes are sent through a the XTestFakeInput request. This issue can lead to local privileges elevation on systems where the X server is running privileged and remote code execution for ssh X forwarding sessions. This issue

CVE-2022-46343 [HIGH] CVE-2022-46343: A vulnerability was found in X A vulnerability was found in X.Org. This security flaw occurs because the handler for the ScreenSaverSetAttributes request may write to memory after it has been freed. This issue can lead to local privileges elevation on systems where the X server is running privileged and remote code execution for ssh X forwarding sessions.

CVE-2022-46344 [HIGH] CVE-2022-46344: A vulnerability was found in X A vulnerability was found in X.Org. This security flaw occurs because the handler for the XIChangeProperty request has a length-validation issues, resulting in out-of-bounds memory reads and potential information disclosure. This issue can lead to local privileges elevation on systems where the X server is running privileged and remote code execution for ssh X forwarding sessions.

CVE-2023-6816 [CRITICAL] CWE-787 CVE-2023-6816: A flaw was found in X.Org server. Both DeviceFocusEvent and the XIQueryPointer reply contain a bit f A flaw was found in X.Org server. Both DeviceFocusEvent and the XIQueryPointer reply contain a bit for each logical button currently down. Buttons can be arbitrarily mapped to any value up to 255, but the X.Org Server was only allocating space for the device's particular number of buttons, leading to a heap overflow if a bigger value was used.

CVE-2022-3550 [HIGH] CVE-2022-3550: A vulnerability classified as critical was found in X A vulnerability classified as critical was found in X.org Server. Affected by this vulnerability is the function _GetCountedString of the file xkb/xkb.c. The manipulation leads to buffer overflow. It is recommended to apply a patch to fix this issue. The associated identifier of this vulnerability is VDB-211051.

CVE-2024-31083 [HIGH] CVE-2024-31083: A use-after-free vulnerability was found in the ProcRenderAddGlyphs() function of Xorg servers A use-after-free vulnerability was found in the ProcRenderAddGlyphs() function of Xorg servers. This issue occurs when AllocateGlyph() is called to store new glyphs sent by the client to the X server, potentially resulting in multiple entries pointing to the same non-refcounted glyphs. Consequently, ProcRenderAddGlyphs() may free a glyph, leading to a use-after-fre

CVE-2022-46342 [HIGH] CVE-2022-46342: A vulnerability was found in X A vulnerability was found in X.Org. This security flaw occurs because the handler for the XvdiSelectVideoNotify request may write to memory after it has been freed. This issue can lead to local privileges elevation on systems where the X se

CVE-2026-50259 [HIGH] CWE-121 CVE-2026-50259: A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. _XkbSetMapChecks() A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. _XkbSetMapChecks() declares a fixed-size stack buffer mapWidths[256] indexed by key type index. The helper function CheckKeyTypes() writes to this buffer at a client-controlled offset, allowing a stack buffer overflow. This may be used to crash the server, or for privilege

CVE-2026-50256 [HIGH] CWE-121 CVE-2026-50256: A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. A mismatch between A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. A mismatch between the X server and the libXfont2 library's maximum font name length can cause a stack buffer overflow during font alias resolution. The server allocates a 256 byte stack buffer but libXfont2's alias target name length is 1024 bytes. A font alias name betwe

CVE-2026-50264 [HIGH] CWE-787 CVE-2026-50264: An out-of-bounds write flaw was found in the X.Org X server and Xwayland in DRIGetBuffers/DRIGetBuff An out-of-bounds write flaw was found in the X.Org X server and Xwayland in DRIGetBuffers/DRIGetBuffersWithFormat. A client that requests multiple DRI2BufferBackLeft attachments and one DRI2BufferFrontLeft can trigger an out-of-bounds heap write. This may be used to crash the server, or for privilege escalation if the X server runs as root.

CVE-2023-6377 [HIGH] CWE-125 CVE-2023-6377: A flaw was found in xorg-server. Querying or changing XKB button actions such as moving from a touch A flaw was found in xorg-server. Querying or changing XKB button actions such as moving from a touchpad to a mouse can result in out-of-bounds memory reads and writes. This may allow local privilege escalation or possible remote code execution in cases where X11 forwarding is involved.

CVE-2024-0229 [HIGH] CWE-787 CVE-2024-0229: An out-of-bounds memory access flaw was found in the X.Org server. This issue can be triggered when An out-of-bounds memory access flaw was found in the X.Org server. This issue can be triggered when a device frozen by a sync grab is reattached to a different master device. This issue may lead to an application crash, local privilege escalation (if the server runs with extended privileges), or remote code execution in SSH X11 forwarding environments.

CVE-2026-50258 [HIGH] CVE-2026-50258: A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. The X server has mu A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. The X server has multiple stack buffers sized XkbMaxShiftLevel * XkbNumKbdGroups but CheckKeyTypes() does not verify or clamp non-canonical key types to XkbMaxShiftLevel. A client can change key types to excessive shift levels and trigger stack overflows. This is caused by an inc

CVE-2024-21885 [HIGH] CVE-2024-21885: A flaw was found in X A flaw was found in X.Org server. In the XISendDeviceHierarchyEvent function, it is possible to exceed the allocated array length when certain new device IDs are added to the xXIHierarchyInfo struct. This can trigger a heap buffer overflow condition, which may lead to an application crash or remote code execution in SSH X11 forwarding environments.

CVE-2026-55999 [HIGH] CWE-122 CVE-2026-55999: Local attackers with a X connection able to provide PCX fonts to the X server xorg-server before 21 Local attackers with a X connection able to provide PCX fonts to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a heap buffer overflow via SetFont due to missing glyph boundary checks.

CVE-2026-50261 [HIGH] CWE-416 CVE-2026-50261: A use-after-free flaw was found in the X.Org X server and Xwayland in SyncChangeCounter(). A client A use-after-free flaw was found in the X.Org X server and Xwayland in SyncChangeCounter(). A client that sets up multiple SyncCounters can trigger a use-after-free when destroying those counters via a second client connection while changing those counters. This may be used to crash the server, or for privilege escalation if the X server runs as root.

CVE-2026-50260 [HIGH] CWE-416 CVE-2026-50260: A use-after-free flaw was found in the X.Org X server and Xwayland in FreeCounter(). A client that s 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 privilege escalation if the X server runs as root.

CVE-2024-21886 [HIGH] CVE-2024-21886: A heap buffer overflow flaw was found in the DisableDevice function in the X A heap buffer overflow flaw was found in the DisableDevice function in the X.Org server. This issue may lead to an application crash or, in some circumstances, remote code execution in SSH X11 forwarding environments.