X.org X Server vulnerabilities

• the xorg project xorg-x11-server, x.org x server, xwayland +2 more xorg-x11-server / xwayland GLX contextTags Use-After-Free in CommonMakeCurrent() CVE-2026-56000 Fix available 9.0 CriticalJuly 8, 2026
• x.org xorg-server, xwayland, x server +2 more xorg-server / xwayland glamor font atlas Heap Buffer Overflow CVE-2026-55999 Fix available 8.5 HighJuly 8, 2026
• x.org x server, xwayland, red hat enterprise linux 10 +16 more +18 more Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free information disclosure in createsaverwindow() CVE-2026-50263 Fix available 5.5 MediumJune 5, 2026
• x.org x server, xwayland, red hat enterprise linux 10 +16 more +18 more Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: out-of-bounds read/write in glx changedrawableattributes CVE-2026-50262 Fix available 5.5 MediumJune 5, 2026
• x.org x server, xwayland, red hat enterprise linux 10 +16 more +18 more Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: out-of-bounds heap write in dri2 drigetbuffers/drigetbufferswithformat CVE-2026-50264 Fix available 7.8 HighJune 5, 2026
• x.org x server, xwayland, red hat enterprise linux 10 +16 more +18 more Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in syncchangecounter() CVE-2026-50261 Fix available 7.8 HighJune 5, 2026
• x.org x server, xwayland, red hat enterprise linux 10 +16 more +18 more Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in freecounter() CVE-2026-50260 Fix available 7.8 HighJune 5, 2026
• x.org x server, xwayland, red hat enterprise linux 10 +16 more +18 more Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: stack buffer overflow in xkb setmap request via mapwidths indexing CVE-2026-50259 Fix available 7.8 HighJune 5, 2026
• x.org x server, xwayland, red hat enterprise linux 10 +16 more +18 more Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: stack buffer overflow in xkb key types due to unchecked shift levels CVE-2026-50258 Fix available 7.8 HighJune 5, 2026
• x.org x server, xwayland, red hat enterprise linux 10 +16 more +18 more Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in misyncdestroyfence() CVE-2026-50257 Fix available 7.8 HighJune 5, 2026
• x.org x server, xwayland, red hat enterprise linux 10 +16 more +18 more Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: stack buffer overflow in font alias resolution due to libxfont2 name length mismatch CVE-2026-50256 Fix available 7.8 HighJune 5, 2026
• x.org x server, red hat enterprise linux 10, enterprise linux 10.0 extended update support +18 more +20 more Xorg: xwayland: x.org x server: information disclosure or denial of service via out-of-bounds read in xkb modifier map handling CVE-2026-34002 Fix available 6.1 MediumApril 14, 2026
• x.org x server, red hat enterprise linux 10, enterprise linux 10.0 extended update support +18 more +20 more Xwayland: xorg: x.org x server: information disclosure and denial of service via out-of-bounds read in xkb geometry processing. CVE-2026-34000 Fix available 6.1 MediumApril 14, 2026
• x.org x server, debian linux, ibm aix +25 more +27 more Xorg: xmayland: value overflow in xkbsetcompatmap() CVE-2025-62231 Fix available 7.3 HighOctober 28, 2025
• x.org x server, xwayland, debian linux +25 more +27 more Xorg: xwayland: use-after-free in xkb client resource removal CVE-2025-62230 Fix available 7.3 HighOctober 28, 2025
• x.org xwayland, red hat enterprise linux 10, enterprise linux 6 +18 more +20 more Xorg: xwayland: use-after-free in syncinittrigger() CVE-2025-26601 Fix available 7.8 HighFebruary 25, 2025
• x.org xwayland, red hat enterprise linux 10, enterprise linux 6 +18 more +20 more Xorg: xwayland: use-after-free in playreleasedevents() CVE-2025-26600 Fix available 7.8 HighFebruary 25, 2025
• x.org xwayland, red hat enterprise linux 10, enterprise linux 6 +18 more +20 more Xorg: xwayland: use of uninitialized pointer in compredirectwindow() CVE-2025-26599 Fix available 7.8 HighFebruary 25, 2025
• x.org xwayland, red hat enterprise linux 10, enterprise linux 6 +18 more +20 more Xorg: xwayland: out-of-bounds write in createpointerbarrierclient() CVE-2025-26598 Fix available 7.8 HighFebruary 25, 2025
• x.org xwayland, red hat enterprise linux 10, enterprise linux 6 +18 more +20 more Xorg: xwayland: buffer overflow in xkbchangetypesofkey() CVE-2025-26597 Fix available 7.8 HighFebruary 25, 2025
• x.org xwayland, red hat enterprise linux 10, enterprise linux 6 +18 more +20 more Xorg: xwayland: heap overflow in xkbwritekeysyms() CVE-2025-26596 Fix available 7.8 HighFebruary 25, 2025
• x.org xwayland, red hat enterprise linux 10, enterprise linux 6 +18 more +20 more Xorg: xwayland: buffer overflow in xkbvmodmasktext() CVE-2025-26595 Fix available 7.8 HighFebruary 25, 2025
• x.org x server, xwayland, red hat enterprise linux 10 +18 more +20 more X.org: xwayland: use-after-free of the root cursor CVE-2025-26594 Fix available 7.8 HighFebruary 25, 2025
• x.org xwayland, fedoraproject fedora, red hat enterprise linux 6 +13 more +15 more Xorg-x11-server: selinux context corruption CVE-2024-0409 Fix available 7.8 HighJanuary 16, 2024
• fedoraproject fedora, red hat enterprise linux 6, enterprise linux 7 +13 more +15 more Xorg-x11-server: selinux unlabeled glx pbuffer CVE-2024-0408 Fix available 5.5 MediumJanuary 16, 2024
• fedoraproject fedora, red hat enterprise linux 6, enterprise linux 6 extended lifecycle support - extension +20 more +22 more Xorg-x11-server: reattaching to different master device may lead to out-of-bounds memory access CVE-2024-0229 Fix available 7.8 HighJanuary 16, 2024
• debian linux, fedoraproject fedora, red hat enterprise linux 6 +19 more +21 more Xorg-x11-server: heap buffer overflow in devicefocusevent and procxiquerypointer CVE-2023-6816 Fix available 9.8 CriticalJanuary 16, 2024
• debian linux, red hat enterprise linux 6, enterprise linux 6 extended lifecycle support - extension +17 more +19 more Xorg-x11-server: out-of-bounds memory read in rrchangeoutputproperty and rrchangeproviderproperty CVE-2023-6478 Fix available 7.6 HighDecember 13, 2023
• debian linux, red hat enterprise linux 6, enterprise linux 6 extended lifecycle support - extension +17 more +19 more Xorg-x11-server: out-of-bounds memory reads/writes in xkb button actions CVE-2023-6377 Fix available 7.8 HighDecember 13, 2023
• red hat enterprise linux 6, enterprise linux 7, enterprise linux 8 +3 more +5 more Xorg-x11-server: use-after-free bug in damagedestroy CVE-2023-5574 Fix available 7.0 HighOctober 25, 2023
• x.org x server, debian linux, fedoraproject fedora +6 more +8 more Xorg-x11-server: use-after-free bug in destroywindow CVE-2023-5380 Fix available 4.7 MediumOctober 25, 2023
• debian linux, fedoraproject fedora, red hat enterprise linux 6 +25 more +27 more Xorg-x11-server: out-of-bounds write in xichangedeviceproperty/rrchangeoutputproperty CVE-2023-5367 Fix available 7.8 HighOctober 25, 2023
• fedoraproject fedora, x.org x server +1 more A flaw was found in X.Org Server Overlay Window. A Use-After-Free may lead to local privilege... CVE-2023-1393 Fix available 7.8 HighMarch 29, 2023
• x.org x server, fedoraproject fedora, redhat enterprise linux +16 more +18 more A vulnerability was found in X.Org. This issue occurs due to a dangling pointer in... CVE-2023-0494 Fix available 7.8 HighFebruary 7, 2023
• x.org x server, debian linux, fedoraproject fedora +1 more +3 more A vulnerability was found in X.Org. This security flaw occurs because the handler for the... CVE-2022-46344 Fix available 8.8 HighDecember 14, 2022
• x.org x server, debian linux, fedoraproject fedora +1 more +3 more A vulnerability was found in X.Org. This security flaw occurs because the handler for the... CVE-2022-46343 Fix available 8.8 HighDecember 14, 2022
• debian linux, fedoraproject fedora, the xorg project xorg-x11-server +1 more +3 more A vulnerability was found in X.Org. This security flaw occurs because the handler for the... CVE-2022-46342 Fix available 8.8 HighDecember 14, 2022
• x.org x server, debian linux, fedoraproject fedora +1 more +3 more A vulnerability was found in X.Org. This security flaw occurs because the handler for the... CVE-2022-46341 Fix available 8.8 HighDecember 14, 2022
• x.org x server, debian linux, fedoraproject fedora +1 more +3 more A vulnerability was found in X.Org. This security flaw occurs becuase the swap handler for the... CVE-2022-46340 Fix available 8.8 HighDecember 14, 2022
• x.org x server, debian linux, fedoraproject fedora +2 more +4 more A vulnerability was found in X.Org. This security flaw occurs because the XkbCopyNames function... CVE-2022-4283 Fix available 7.8 HighDecember 14, 2022
• devolutions server, x.org x server +1 more X.org Server xquartz X11Controller.m denial of service CVE-2022-3553 Fix available 3.5 LowOctober 17, 2022
• devolutions server, debian linux, fedoraproject fedora +1 more +3 more X.org Server xkb.c ProcXkbGetKbdByName memory leak CVE-2022-3551 Fix available 3.5 LowOctober 17, 2022
• devolutions server, debian linux, fedoraproject fedora +1 more +3 more X.org Server xkb.c _GetCountedString buffer overflow CVE-2022-3550 Fix available 5.5 MediumOctober 17, 2022
• the xorg project xorg-x11-server, x.org x server +1 more A flaw was found in the Xorg-x11-server. The specific flaw exists within the handling of... CVE-2022-2320 Fix available 7.8 HighJuly 12, 2022
• the xorg project xorg-x11-server, x.org x server +1 more A flaw was found in the Xorg-x11-server. An out-of-bounds access issue can occur in the... CVE-2022-2319 Fix available 7.8 HighJuly 12, 2022
• the xorg project xorg-x11-server, debian linux, fedoraproject fedora +1 more +3 more A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of... CVE-2021-4011 Fix available 7.8 HighDecember 14, 2021
• the xorg project xorg-x11-server, debian linux, fedoraproject fedora +1 more +3 more A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of... CVE-2021-4010 Fix available 7.8 HighDecember 14, 2021
• the xorg project xorg-x11-server, debian linux, fedoraproject fedora +1 more +3 more A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of... CVE-2021-4009 Fix available 7.8 HighDecember 14, 2021
• the xorg project xorg-x11-server, debian linux, fedoraproject fedora +1 more +3 more A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of... CVE-2021-4008 Fix available 7.8 HighDecember 14, 2021
• the xorg project xorg-x11-server, x.org x server +1 more A privilege escalation flaw was found in the Xorg-x11-server due to a lack of authentication for... CVE-2020-25697 Fix available 7.0 HighMay 26, 2021
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