x_server vulnerabilities
CVEs whose affected-version data names the x_server package. Each record lists the affected and patched versions; check a specific version with the dependency checker or POST /api/sbom.
22 CVEsRSS
CVE-2026-50264High· 7.8An out-of-bounds write flaw was found in the X.Org X server and Xwayland in DRIGetBuffers/DRIGetBuffersWithFormat
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 he…
CVE-2026-50263Medium· 5.5A use-after-free flaw was found in the X.Org X server and Xwayland 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.
CVE-2026-50262Medium· 5.5An out-of-bounds read flaw was found in the X.Org X server and Xwayland in __glXDisp_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 informa…
CVE-2026-50261High· 7.8A use-after-free flaw was found in the X.Org X server and Xwayland in SyncChangeCounter()
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 chang…
CVE-2026-50260High· 7.8A use-after-free flaw was found in the X.Org X server and Xwayland in FreeCounter()
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…
CVE-2026-50259High· 7.8A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland
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…
CVE-2026-50258High· 7.8A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland
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 Xkb…
CVE-2026-50257High· 7.8A use-after-free flaw was found in the X.Org X server and Xwayland in miSyncDestroyFence()
A use-after-free flaw was found in the X.Org X server and Xwayland in miSyncDestroyFence(). A client that sets up multiple fence triggers can trigger a use-after-free function pointer call. An attacker would connect to the X server to se…
CVE-2026-50256High· 7.8A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland
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 ser…
CVE-2025-26601High· 7.8A use-after-free flaw was found in X.Org and Xwayland
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…
CVE-2025-26600High· 7.8A use-after-free flaw was found in X.Org and Xwayland
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-2025-26599High· 7.8An access to an uninitialized pointer flaw was found in X.Org and Xwayland
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 valid…
CVE-2025-26598High· 7.8An out-of-bounds write flaw was found in X.Org and Xwayland
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 c…
CVE-2025-26597High· 7.8A buffer overflow flaw was found in X.Org and Xwayland
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-zer…
CVE-2025-26596High· 7.8A heap overflow flaw was found in X.Org and Xwayland
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-2025-26595High· 7.8A buffer overflow flaw was found in X.Org and Xwayland
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 buf…
CVE-2025-26594High· 7.8A use-after-free flaw was found in X.Org and Xwayland
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-2023-6478High· 7.6A flaw was found in xorg-server
A flaw was found in xorg-server. A specially crafted request to RRChangeProviderProperty or RRChangeOutputProperty can trigger an integer overflow which may lead to a disclosure of sensitive information.
CVE-2023-6377High· 7.8A flaw was found in xorg-server
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 exe…
CVE-2023-5574High· 7.0A use-after-free flaw was found in xorg-x11-server-Xvfb
A use-after-free flaw was found in xorg-x11-server-Xvfb. This issue occurs in Xvfb with a very specific and legacy configuration (a multi-screen setup with multiple protocol screens, also known as Zaphod mode). If the pointer is warped f…
CVE-2023-5380Medium· 4.7A use-after-free flaw was found in the xorg-x11-server
A use-after-free flaw was found in the xorg-x11-server. An X server crash may occur in a very specific and legacy configuration (a multi-screen setup with multiple protocol screens, also known as Zaphod mode) if the pointer is warped fro…
CVE-2023-5367High· 7.8A out-of-bounds write flaw was found in the xorg-x11-server
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 RRCha…