X.Org X Server vulnerabilities

CVE-2021-3472 [HIGH] CWE-191 CVE-2021-3472: A flaw was found in xorg-x11-server in versions before 1.20.11. An integer underflow can occur in xs A flaw was found in xorg-x11-server in versions before 1.20.11. An integer underflow can occur in xserver which can lead to a local privilege escalation. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVE-2021-4009 [HIGH] CWE-119 CVE-2021-4009: A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of-bounds a 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 SProcXFixesCreatePointerBarrier function. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVE-2021-4010 [HIGH] CWE-119 CVE-2021-4010: A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of-bounds a 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 SProcScreenSaverSuspend function. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVE-2023-5367 [HIGH] CWE-787 CVE-2023-5367: A out-of-bounds write flaw was found in the xorg-x11-server. This issue occurs due to an incorrect c A out-of-bounds write flaw was found in the xorg-x11-server. This issue occurs due to an incorrect calculation of a buffer offset when copying data stored in the heap in the XIChangeDeviceProperty function in Xi/xiproperty.c and in RRChangeOutputProperty function in randr/rrproperty.c, allowing for possible escalation of privileges or denial of service.

CVE-2021-4011 [HIGH] CWE-119 CVE-2021-4011: A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of-bounds a 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.

CVE-2021-4008 [HIGH] CWE-119 CVE-2021-4008: A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of-bounds a 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 SProcRenderCompositeGlyphs function. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVE-2022-2319 [HIGH] CWE-1320 CVE-2022-2319: A flaw was found in the Xorg-x11-server. An out-of-bounds access issue can occur in the ProcXkbSetGe A flaw was found in the Xorg-x11-server. An out-of-bounds access issue can occur in the ProcXkbSetGeometry function due to improper validation of the request length.

CVE-2025-26597 [HIGH] CWE-119 CVE-2025-26597: A buffer overflow flaw was found in X.Org and Xwayland. If XkbChangeTypesOfKey() is called with a 0 A buffer overflow flaw was found in X.Org and Xwayland. If XkbChangeTypesOfKey() is called with a 0 group, it will resize the key symbols table to 0 but leave the key actions unchanged. If the same function is later called with a non-zero value of groups, this will cause a buffer overflow because the key actions are of the wrong size.

CVE-2025-26596 [HIGH] CWE-787 CVE-2025-26596: A heap overflow flaw was found in X.Org and Xwayland. The computation of the length in XkbSizeKeySym A heap overflow flaw was found in X.Org and Xwayland. The computation of the length in XkbSizeKeySyms() differs from what is written in XkbWriteKeySyms(), which may lead to a heap-based buffer overflow.

CVE-2026-56000 [HIGH] CWE-416 CVE-2026-56000: Local attackers with a X connection able to provide GLX commit to the X server xorg-server before 21 Local attackers with a X connection able to provide GLX commit to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a Heap Use After Free, due to CommonMakeCurrent() pointing into potentially reallocated memory.

CVE-2022-49737 [HIGH] CWE-413 CVE-2022-49737: In X.Org X server 20.11 through 21.1.16, when a client application uses easystroke for mouse gesture In X.Org X server 20.11 through 21.1.16, when a client application uses easystroke for mouse gestures, the main thread modifies various data structures used by the input thread without acquiring a lock, aka a race condition. In particular, AttachDevice in dix/devices.c does not acquire an input lock.

CVE-2025-62231 [HIGH] CWE-190 CVE-2025-62231: A flaw was identified in the X.Org X server’s X Keyboard (Xkb) extension where improper bounds check A flaw was identified in the X.Org X server’s X Keyboard (Xkb) extension where improper bounds checking in the XkbSetCompatMap() function can cause an unsigned short overflow. If an attacker sends specially crafted input data, the value calculation may overflow, leading to memory corruption or a crash.

CVE-2020-14346 [HIGH] CWE-191 CVE-2020-14346: A flaw was found in xorg-x11-server before 1.20.9. An integer underflow in the X input extension pro A flaw was found in xorg-x11-server before 1.20.9. An integer underflow in the X input extension protocol decoding in the X server may lead to arbitrary access of memory contents. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVE-2020-14345 [HIGH] CWE-119 CVE-2020-14345: A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Out-Of-Bounds access in XkbSetNam A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Out-Of-Bounds access in XkbSetNames function may lead to a privilege escalation vulnerability. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVE-2020-14360 [HIGH] CWE-119 CVE-2020-14360: A flaw was found in the X.Org Server before version 1.20.10. An out-of-bounds access in the XkbSetMa A flaw was found in the X.Org Server before version 1.20.10. An out-of-bounds access in the XkbSetMap function may lead to a privilege escalation vulnerability. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVE-2025-26600 [HIGH] CWE-416 CVE-2025-26600: A use-after-free flaw was found in X.Org and Xwayland. When a device is removed while still frozen, A use-after-free flaw was found in X.Org and Xwayland. When a device is removed while still frozen, the events queued for that device remain while the device is freed. Replaying the events will cause a use-after-free.

CVE-2025-26594 [HIGH] CWE-416 CVE-2025-26594: A use-after-free flaw was found in X.Org and Xwayland. The root cursor is referenced in the X server A use-after-free flaw was found in X.Org and Xwayland. The root cursor is referenced in the X server as a global variable. If a client frees the root cursor, the internal reference points to freed memory and causes a use-after-free.

CVE-2025-62230 [HIGH] CWE-416 CVE-2025-62230: A flaw was discovered in the X.Org X server’s X Keyboard (Xkb) extension when handling client resour A flaw was discovered in the X.Org X server’s X Keyboard (Xkb) extension when handling client resource cleanup. The software frees certain data structures without properly detaching related resources, leading to a use-after-free condition. This can cause memory corruption or a crash when affected clients disconnect.

CVE-2020-14361 [HIGH] CWE-191 CVE-2020-14361: A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Integer underflow leading to heap A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Integer underflow leading to heap-buffer overflow may lead to a privilege escalation vulnerability. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

CVE-2020-14362 [HIGH] CWE-191 CVE-2020-14362: A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Integer underflow leading to heap A flaw was found in X.Org Server before xorg-x11-server 1.20.9. An Integer underflow leading to heap-buffer overflow may lead to a privilege escalation vulnerability. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.