Debian Xorg-Server vulnerabilities

CVE-2025-26594 [HIGH] CVE-2025-26594: xorg-server - A use-after-free flaw was found in X.Org and Xwayland. The root cursor is refere... 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. Scope: local bookworm: resolved (fixed in 2:21.1.7-3+deb12u9) bullseye: resolved (fixed in 2:1.20.11-1+deb11u15) forky: resolved (f

CVE-2025-26599 [HIGH] CVE-2025-26599: xorg-server - An access to an uninitialized pointer flaw was found in X.Org and Xwayland. The ... An access to an uninitialized pointer flaw was found in X.Org and Xwayland. The function compCheckRedirect() may fail if it cannot allocate the backing pixmap. In that case, compRedirectWindow() will return a BadAlloc error without validating the window tree marked just before, which leaves the validated data partly initialized and the use of an uninitialized po

CVE-2025-49179 [HIGH] CVE-2025-49179: xorg-server - A flaw was found in the X Record extension. The RecordSanityCheckRegisterClients... A flaw was found in the X Record extension. The RecordSanityCheckRegisterClients function does not check for an integer overflow when computing request length, which allows a client to bypass length checks. Scope: local bookworm: resolved (fixed in 2:21.1.7-3+deb12u10) bullseye: resolved (fixed in 2:1.20.11-1+deb11u16) forky: resolved (fixed in 2:21.1.16-1.2) si

CVE-2025-26601 [HIGH] CVE-2025-26601: xorg-server - A use-after-free flaw was found in X.Org and Xwayland. When changing an alarm, t... A use-after-free flaw was found in X.Org and Xwayland. When changing an alarm, the values of the change mask are evaluated one after the other, changing the trigger values as requested, and eventually, SyncInitTrigger() is called. If one of the changes triggers an error, the function will return early, not adding the new sync object, possibly causing a use-after

CVE-2025-26600 [HIGH] CVE-2025-26600: xorg-server - A use-after-free flaw was found in X.Org and Xwayland. When a device is removed ... 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. Scope: local bookworm: resolved (fixed in 2:21.1.7-3+deb12u9) bullseye: resolved (fixed in 2:1.20.11-1+deb11u15) forky: resolved (fixed in 2:21.1.

CVE-2025-49176 [HIGH] CVE-2025-49176: xorg-server - A flaw was found in the Big Requests extension. The request length is multiplied... A flaw was found in the Big Requests extension. The request length is multiplied by 4 before checking against the maximum allowed size, potentially causing an integer overflow and bypassing the size check. Scope: local bookworm: resolved (fixed in 2:21.1.7-3+deb12u10) bullseye: resolved (fixed in 2:1.20.11-1+deb11u16) forky: resolved (fixed in 2:21.1.16-1.3) sid

CVE-2025-26595 [HIGH] CVE-2025-26595: xorg-server - A buffer overflow flaw was found in X.Org and Xwayland. The code in XkbVModMaskT... A buffer overflow flaw was found in X.Org and Xwayland. The code in XkbVModMaskText() allocates a fixed-sized buffer on the stack and copies the names of the virtual modifiers to that buffer. The code fails to check the bounds of the buffer and would copy the data regardless of the size. Scope: local bookworm: resolved (fixed in 2:21.1.7-3+deb12u9) bullseye: res

CVE-2025-62230 [HIGH] CVE-2025-62230: xorg-server - A flaw was discovered in the X.Org X server’s X Keyboard (Xkb) extension when ha... 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. Scope: local bookworm: resolved (fixed in 2:21

CVE-2025-26598 [HIGH] CVE-2025-26598: xorg-server - An out-of-bounds write flaw was found in X.Org and Xwayland. The function GetBar... An out-of-bounds write flaw was found in X.Org and Xwayland. The function GetBarrierDevice() searches for the pointer device based on its device ID and returns the matching value, or supposedly NULL, if no match was found. However, the code will return the last element of the list if no matching device ID is found, which can lead to out-of-bounds memory access.

CVE-2025-26597 [HIGH] CVE-2025-26597: xorg-server - A buffer overflow flaw was found in X.Org and Xwayland. If XkbChangeTypesOfKey()... 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. Scope: local bookworm: reso

CVE-2025-26596 [HIGH] CVE-2025-26596: xorg-server - A heap overflow flaw was found in X.Org and Xwayland. The computation of the len... 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. Scope: local bookworm: resolved (fixed in 2:21.1.7-3+deb12u9) bullseye: resolved (fixed in 2:1.20.11-1+deb11u15) forky: resolved (fixed in 2:21.1.16-1) sid: reso

CVE-2025-62231 [HIGH] CVE-2025-62231: xorg-server - A flaw was identified in the X.Org X server’s X Keyboard (Xkb) extension where i... 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. Scope: local bookworm: resolved (fixed in 2:21.1.7-3+deb12u1

CVE-2025-49180 [HIGH] CVE-2025-49180: xorg-server - A flaw was found in the RandR extension, where the RRChangeProviderProperty func... A flaw was found in the RandR extension, where the RRChangeProviderProperty function does not properly validate input. This issue leads to an integer overflow when computing the total size to allocate. Scope: local bookworm: resolved (fixed in 2:21.1.7-3+deb12u10) bullseye: resolved (fixed in 2:1.20.11-1+deb11u16) forky: resolved (fixed in 2:21.1.16-1.2) sid: re

CVE-2025-62229 [HIGH] CVE-2025-62229: xorg-server - A flaw was found in the X.Org X server and Xwayland when processing X11 Present ... A flaw was found in the X.Org X server and Xwayland when processing X11 Present extension notifications. Improper error handling during notification creation can leave dangling pointers that lead to a use-after-free condition. This can cause memory corruption or a crash, potentially allowing an attacker to execute arbitrary code or cause a denial of service. Sco

CVE-2025-49177 [MEDIUM] CVE-2025-49177: xorg-server - A flaw was found in the XFIXES extension. The XFixesSetClientDisconnectMode hand... A flaw was found in the XFIXES extension. The XFixesSetClientDisconnectMode handler does not validate the request length, allowing a client to read unintended memory from previous requests. Scope: local bookworm: resolved (fixed in 2:21.1.7-3+deb12u10) bullseye: resolved forky: resolved (fixed in 2:21.1.16-1.2) sid: resolved (fixed in 2:21.1.16-1.2) trixie: re

CVE-2025-49178 [MEDIUM] CVE-2025-49178: xorg-server - A flaw was found in the X server's request handling. Non-zero 'bytes to ignore' ... A flaw was found in the X server's request handling. Non-zero 'bytes to ignore' in a client's request can cause the server to skip processing another client's request, potentially leading to a denial of service. Scope: local bookworm: resolved (fixed in 2:21.1.7-3+deb12u10) bullseye: resolved (fixed in 2:1.20.11-1+deb11u16) forky: resolved (fixed in 2:21.1.16-

CVE-2025-49175 [MEDIUM] CVE-2025-49175: xorg-server - A flaw was found in the X Rendering extension's handling of animated cursors. If... A flaw was found in the X Rendering extension's handling of animated cursors. If a client provides no cursors, the server assumes at least one is present, leading to an out-of-bounds read and potential crash. Scope: local bookworm: resolved (fixed in 2:21.1.7-3+deb12u10) bullseye: resolved (fixed in 2:1.20.11-1+deb11u16) forky: resolved (fixed in 2:21.1.16-1.2

CVE-2024-0229 [HIGH] CVE-2024-0229: xorg-server - An out-of-bounds memory access flaw was found in the X.Org server. This issue ca... 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. Scope: loca

CVE-2024-21886 [HIGH] CVE-2024-21886: xorg-server - A heap buffer overflow flaw was found in the DisableDevice function in the X.Org... 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. Scope: local bookworm: resolved (fixed in 2:21.1.7-3+deb12u5) bullseye: resolved (fixed in 2:1.20.11-1+deb11u11) forky: resolved (fixed in 2:21.1.

CVE-2024-9632 [HIGH] CVE-2024-9632: xorg-server - A flaw was found in the X.org server. Due to improperly tracked allocation size ... A flaw was found in the X.org server. Due to improperly tracked allocation size in _XkbSetCompatMap, a local attacker may be able to trigger a buffer overflow condition via a specially crafted payload, leading to denial of service or local privilege escalation in distributions where the X.org server is run with root privileges. Scope: local bookworm: resolved (fix