RHSA-2026:20558 Red Hat Security Advisory: xorg-x11-server security update

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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...

xorg: xwayland: X.Org X server: Denial of Service via integer underflow in XKB compatibility map handling

A flaw was found in the X.Org X server. This integer underflow vulnerability, specifically in the XKB compatibility map handling, allows an attacker with local or remote X11 server access to trigger a buffer read overrun. This can lead to memory-safety violations and potentially a denial of servi...

xorg: xwayland: X.Org X server: Use-after-free vulnerability leads to server crash and potential memory corruption

A flaw was found in the X.Org X server. This use-after-free vulnerability occurs in the XSYNC fence triggering logic, specifically within the miSyncTriggerFence function. An attacker with access to the X11 server can exploit this without user interaction, leading to a server crash and potentially...

[SECURITY] Fedora 44 Update: xorg-x11-server-21.1.22-1.fc44

X.Org X11 X server...

EUVD-2026-25229

A flaw was found in the X.Org X server. This integer underflow vulnerability, specifically in the XKB compatibility map handling, allows an attacker with local or remote X11 server access to trigger a buffer read overrun. This can lead to memory-safety violations and potentially a denial of servi...

CVE-2026-34001

A flaw was found in the X.Org X server. This use-after-free vulnerability occurs in the XSYNC fence triggering logic, specifically within the miSyncTriggerFence function. An attacker with access to the X11 server can exploit this without user interaction, leading to a server crash and potentially...

Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: xorg-x11-server (UTSA-2026-006189)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-006189 advisory. 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...

MiracleLinux 8 : xorg-x11-server-Xwayland-21.1.3-10.el8 (AXSA:2023-5920:02)

The remote MiracleLinux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the AXSA:2023-5920:02 advisory. xorg-x11-server: buffer overflow in GetCountedString in xkb/xkb.c CVE-2022-3550 xorg-x11-server: XkbGetKbdByName use-after-free CVE-2022-4283...

MiracleLinux 7 : xorg-x11-server-1.20.4-99.0.6.el7.AXS7 (AXSA:2025-10912:05)

The remote MiracleLinux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2025-10912:05 advisory. CVE-2025-49178: fix request handling flaw causing potential denial of service CVEs: CVE-2025-49178 A flaw was found in the X server's request...

RHSA-2025:22729 Red Hat Security Advisory: xorg-x11-server security update

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xorg: xmayland: Use-after-free in XPresentNotify structure creation

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...

[SECURITY] Fedora 42 Update: xorg-x11-server-21.1.20-1.fc42

X.Org X11 X server...

RHSA-2025:19432 Red Hat Security Advisory: xorg-x11-server-Xwayland security update

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EUVD-2005-1724

Malware in sbrugna...

Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: xorg-x11-server (UTSA-2025-644483)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2025-644483 advisory. 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 conditi...

xorg-x11-server-Xwayland: xorg-x11-server: tigervnc: Unprocessed Client Request Due to 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...

xorg-x11-server-Xwayland: xorg-x11-server: tigervnc: Integer Overflow in Big Requests Extension

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...

xorg-x11-server-Xwayland: xorg-x11-server: tigervnc: Integer Overflow in Big Requests Extension

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...

xorg: xwayland: Use-after-free in SyncInitTrigger()

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...