https://patchthecve.com/CVEs with upgrade or downgrade fix stepshttps://patchthecve.com/cve/CVE-2026-56000.htmlhttps://patchthecve.com/cve/CVE-2026-56000.htmlThu, 09 Jul 2026 19:47:29 +0000HIGH 7.8: Local attackers with a X connection able to provide GLX commit to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a Heap Use After Free, due to CommonMakeCurrent() pointing into potentially reallocated memory.https://patchthecve.com/cve/CVE-2026-55999.htmlhttps://patchthecve.com/cve/CVE-2026-55999.htmlThu, 09 Jul 2026 19:49:51 +0000HIGH 8.5: Local attackers with a X connection able to provide PCX fonts to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a heap buffer overflow via SetFont due to missing glyph boundary checks.https://patchthecve.com/cve/CVE-2026-50264.htmlhttps://patchthecve.com/cve/CVE-2026-50264.htmlMon, 27 Jul 2026 13:18:19 +0000HIGH 7.8: 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 heap write. This may be used to crash the server, or for privileghttps://patchthecve.com/cve/CVE-2026-50263.htmlhttps://patchthecve.com/cve/CVE-2026-50263.htmlWed, 05 Aug 2026 00:17:04 +0000MEDIUM 5.5: 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.https://patchthecve.com/cve/CVE-2026-50262.htmlhttps://patchthecve.com/cve/CVE-2026-50262.htmlWed, 05 Aug 2026 00:17:04 +0000MEDIUM 5.5: 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 information disclosure. A write path also exists but requires byte-swahttps://patchthecve.com/cve/CVE-2026-50261.htmlhttps://patchthecve.com/cve/CVE-2026-50261.htmlWed, 05 Aug 2026 13:23:33 +0000HIGH 7.8: 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 changing those counters. This may be used to crash the server, or fohttps://patchthecve.com/cve/CVE-2026-50260.htmlhttps://patchthecve.com/cve/CVE-2026-50260.htmlWed, 05 Aug 2026 13:23:32 +0000HIGH 7.8: 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 connection. This may be used to crash the server, or for privihttps://patchthecve.com/cve/CVE-2026-50259.htmlhttps://patchthecve.com/cve/CVE-2026-50259.htmlWed, 05 Aug 2026 13:23:31 +0000HIGH 7.8: 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 a client-controlled offset, allowing a stack buffer overflow. https://patchthecve.com/cve/CVE-2026-50258.htmlhttps://patchthecve.com/cve/CVE-2026-50258.htmlWed, 05 Aug 2026 13:23:30 +0000HIGH 7.8: 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 XkbMaxShiftLevel. A client can change key types to excessive shifthttps://patchthecve.com/cve/CVE-2026-50257.htmlhttps://patchthecve.com/cve/CVE-2026-50257.htmlWed, 05 Aug 2026 13:23:29 +0000HIGH 7.8: 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 set up a fence and await that fence, then a second X connection dhttps://patchthecve.com/cve/CVE-2026-50256.htmlhttps://patchthecve.com/cve/CVE-2026-50256.htmlWed, 05 Aug 2026 13:23:28 +0000HIGH 7.8: 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 server allocates a 256 byte stack buffer but libXfont2's alias tar