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oss-secFW: X.Org Security Advisory: multiple security issues X.Org X server and Xwayland

First published (updated )
https://seclists.org/oss-sec/2026/q3/94

X.Org xorg-serverxorg-x11-server / xwayland GLX contextTags Use-After-Free in CommonMakeCurrent()

Risk 81
Severity
9
First published (updated )
CVE-2026-56000

X.Org Foundation xorg-serverxorg-server / xwayland glamor font atlas Heap Buffer Overflow

Risk 77
Severity
8.5
First published (updated )
CVE-2026-55999

redhat Enterprise LinuxXorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free information disclosure in createsaverwindow()

Risk 34
Severity
5.5
First published (updated )
CVE-2026-50263

redhat Enterprise LinuxXorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: out-of-bounds read/write in glx changedrawableattributes

Risk 34
Severity
5.5
First published (updated )
CVE-2026-50262
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redhat Enterprise LinuxXorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: out-of-bounds heap write in dri2 drigetbuffers/drigetbufferswithformat

Risk 73
Severity
7.8
First published (updated )
CVE-2026-50264

redhat Enterprise LinuxXorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in syncchangecounter()

Risk 74
Severity
7.8
First published (updated )
CVE-2026-50261

redhat Enterprise LinuxXorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: stack buffer overflow in xkb setmap request via mapwidths indexing

Risk 74
Severity
7.8
First published (updated )
CVE-2026-50259

redhat Enterprise LinuxXorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in misyncdestroyfence()

Risk 74
Severity
7.8
First published (updated )
CVE-2026-50257

redhat Enterprise LinuxXorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in freecounter()

Risk 74
Severity
7.8
First published (updated )
CVE-2026-50260
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redhat Enterprise LinuxXorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: stack buffer overflow in xkb key types due to unchecked shift levels

Risk 74
Severity
7.8
First published (updated )
CVE-2026-50258

redhat Enterprise LinuxXorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: stack buffer overflow in font alias resolution due to libxfont2 name length mismatch

Risk 74
Severity
7.8
First published (updated )
CVE-2026-50256

redhat Enterprise LinuxXorg: xwayland: x.org x server: information disclosure or denial of service via out-of-bounds read in xkb modifier map handling

Risk 70
Severity
9.1
First published (updated )
CVE-2026-34002

redhat Enterprise LinuxXwayland: xorg: x.org x server: information disclosure and denial of service via out-of-bounds read in xkb geometry processing.

Risk 70
Severity
9.1
First published (updated )
CVE-2026-34000

redhat Enterprise Linux Update Services For Sap SolutionsXorg: xmayland: value overflow in xkbsetcompatmap()

Risk 64
Severity
7.3
First published (updated )
CVE-2025-62231
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X.Org X ServerInteger Overflow

Risk 19
Severity
4
First published (updated )
REDHAT-BUG-2402660

redhat Enterprise Linux Update Services For Sap SolutionsXorg: xwayland: use-after-free in xkb client resource removal

Risk 64
Severity
7.3
First published (updated )
CVE-2025-62230

X.Org X ServerUse After Free

Risk 19
Severity
4
First published (updated )
REDHAT-BUG-2402653

X.Org X ServerUse After Free

Risk 19
Severity
4
First published (updated )
REDHAT-BUG-2402649

X.Org X ServerXorg-x11-server-xwayland: xorg-x11-server: tigervnc: unprocessed client request due to bytes to ignore

Risk 34
Severity
5.5
First published (updated )
CVE-2025-49178
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redhat Enterprise LinuxXorg: xwayland: heap overflow in xkbwritekeysyms()

Risk 53
Severity
7.8
EPSS
0.02%
First published (updated )
CVE-2025-26596

redhat Enterprise LinuxXorg: xwayland: buffer overflow in xkbchangetypesofkey()

Risk 54
Severity
7.8
EPSS
0.02%
First published (updated )
CVE-2025-26597

redhat Enterprise LinuxXorg: xwayland: buffer overflow in xkbvmodmasktext()

Risk 53
Severity
7.8
EPSS
0.02%
First published (updated )
CVE-2025-26595

X.Org XwaylandXorg: xwayland: use-after-free in playreleasedevents()

Risk 53
Severity
7.8
EPSS
0.02%
First published (updated )
CVE-2025-26600

X.Org XwaylandXorg: xwayland: use of uninitialized pointer in compredirectwindow()

Risk 53
Severity
7.8
EPSS
0.02%
First published (updated )
CVE-2025-26599
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redhat Enterprise LinuxXorg: xwayland: out-of-bounds write in createpointerbarrierclient()

Risk 53
Severity
7.8
EPSS
0.02%
First published (updated )
CVE-2025-26598

redhat Enterprise LinuxXorg: xwayland: use-after-free in syncinittrigger()

Risk 53
Severity
7.8
EPSS
0.02%
First published (updated )
CVE-2025-26601

redhat Enterprise LinuxX.org: xwayland: use-after-free of the root cursor

Risk 53
Severity
7.8
EPSS
0.02%
First published (updated )
CVE-2025-26594

debian/xorg-serverXorg-x11-server: heap buffer overflow in devicefocusevent and procxiquerypointer

Risk 62
Severity
9.8
EPSS
0.13%
First published (updated )
CVE-2023-6816

redhat Enterprise LinuxXorg-x11-server: selinux context corruption

Risk 53
Severity
7.8
EPSS
0.04%
First published (updated )
CVE-2024-0409
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