An update for xorg-x11-server is now available for openEuler-24.03-LTS-SP4 Security Advisory openeuler-security@openeuler.org openEuler security committee openEuler-SA-2026-4471 Final 1.0 1.0 2026-10-22 Initial 2026-10-22 2026-10-22 openEuler SA Tool V1.0 2026-10-22 xorg-x11-server security update An update for xorg-x11-server is now available for openEuler-24.03-LTS-SP4 X.Org X11 X server Security Fix(es): A flaw was found in the X.Org X Server and XWayland. An error handling issue in the X Keyboard Extension (XKB) geometry processing fails to clear a memory pointer after an allocation failure, leading to a double-free condition during cleanup. A local user can exploit this vulnerability by sending a specially crafted request to the display server. This can cause memory corruption, potentially resulting in a Denial of Service (DoS) or arbitrary code execution with elevated privileges. (From Red Hat.)(CVE-2026-88812) A flaw was found in xorg-x11-server. A use-after-free vulnerability, where the application accesses memory after it has already been released, occurs in the Present extension because window notification entries are not properly unlinked before cleaning up window resources. An authenticated local X client can exploit this flaw by creating cross-window notifications and subsequently destroying the target window. Successful exploitation primarily results in a Denial of Service (DoS) via an X server crash, and may potentially lead to information disclosure.(CVE-2026-93515) A flaw was found in xorg-x11-server. A local user can exploit a use-after-free condition—where the software attempts to access memory after it has been freed—by establishing a passive input grab and removing an input device. When subsequent input events are processed, the server dereferences the dangling device pointer. This flaw can lead to arbitrary code execution or a Denial of Service (DoS) via an X server crash.(CVE-2026-93516) A flaw was found in xorg-x11-server. The GLX (OpenGL Extension to the X Window System) interface fails to verify that incoming data sizes do not exceed allocated buffer limits when handling large rendering requests. An authenticated local client can exploit this vulnerability by sending a specially crafted request, triggering a heap-based buffer overflow. Successful exploitation can result in arbitrary code execution with the privileges of the X server or cause a Denial of Service (DoS) by crashing the application. (From Red Hat.)(CVE-2026-93517) A flaw was found in xorg-x11-server. Due to an integer truncation issue during memory allocation calculations within the X Keyboard Extension (XKB), the server allocates an undersized buffer when resizing key types. An authenticated local client can exploit this vulnerability by sending specially crafted XKB requests, causing a heap-based buffer overflow. This can result in arbitrary code execution or a denial of service (DoS). (From Red Hat.)(CVE-2026-93518) Input_constrain_cursor() writes barrier events into a fixed-size buffer without checking bounds. When more than 100 pointer barriers are active, the writes overflow the fixed buffer on the stack or heap. An authenticated X client can trigger this by creating more than 100 pointer barriers (using the XFIXES extension) and then generating pointer motion events (e.g. via XTEST). Both extensions are enabled by default.(CVE-2026-93519) A flaw was found in xorg-x11-server. In the X Keyboard Extension (XKB), key name memory is allocated with an insufficient buffer size compared to the maximum supported range. An authenticated local client can exploit this flaw by sending requests that modify the keycode range, triggering a heap-based buffer overflow. This vulnerability can lead to arbitrary code execution or cause a Denial of Service (DoS) by crashing the X server.(CVE-2026-93520) A flaw was found in xorg-x11-server. The X server incorrectly calculates buffer sizes and memory offsets when prepending or appending data to RandR (Resize and Rotate extension) provider properties. A local attacker can exploit this vulnerability by sending specially crafted property update requests, causing memory corruption. This flaw could allow an attacker to escalate privileges or cause a denial of service (DoS) by crashing the X server.(CVE-2026-93521) A flaw was found in xorg-x11-server. A local authenticated client can exploit this flaw by sending a crafted input device ungrab request with an unvalidated modifier value. This lack of validation causes the server to perform an out-of-bounds write on the heap, resulting in memory corruption that can lead to a denial of service (DoS) or potential arbitrary code execution.(CVE-2026-93523) A flaw was found in xorg-x11-server. An authenticated local user can trigger an out-of-bounds heap memory read by sending specially crafted X Keyboard Extension (XKB) requests with inconsistent key range parameters. This flaw leads to information disclosure, allowing the user to read sensitive data from the server's heap memory.(CVE-2026-93524) An update for xorg-x11-server is now available for openEuler-24.03-LTS-SP4. openEuler Security has rated this update as having a security impact of high. A Common Vunlnerability Scoring System(CVSS)base score,which gives a detailed severity rating, is available for each vulnerability from the CVElink(s) in the References section. High xorg-x11-server https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4471 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-88812 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-93515 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-93516 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-93517 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-93518 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-93519 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-93520 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-93521 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-93523 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-93524 https://nvd.nist.gov/vuln/detail/CVE-2026-88812 https://nvd.nist.gov/vuln/detail/CVE-2026-93515 https://nvd.nist.gov/vuln/detail/CVE-2026-93516 https://nvd.nist.gov/vuln/detail/CVE-2026-93517 https://nvd.nist.gov/vuln/detail/CVE-2026-93518 https://nvd.nist.gov/vuln/detail/CVE-2026-93519 https://nvd.nist.gov/vuln/detail/CVE-2026-93520 https://nvd.nist.gov/vuln/detail/CVE-2026-93521 https://nvd.nist.gov/vuln/detail/CVE-2026-93523 https://nvd.nist.gov/vuln/detail/CVE-2026-93524 openEuler-24.03-LTS-SP4 xorg-x11-server-1.20.11-49.oe2403sp4.aarch64.rpm xorg-x11-server-Xdmx-1.20.11-49.oe2403sp4.aarch64.rpm xorg-x11-server-Xephyr-1.20.11-49.oe2403sp4.aarch64.rpm xorg-x11-server-Xnest-1.20.11-49.oe2403sp4.aarch64.rpm xorg-x11-server-Xvfb-1.20.11-49.oe2403sp4.aarch64.rpm xorg-x11-server-common-1.20.11-49.oe2403sp4.aarch64.rpm xorg-x11-server-debuginfo-1.20.11-49.oe2403sp4.aarch64.rpm xorg-x11-server-debugsource-1.20.11-49.oe2403sp4.aarch64.rpm xorg-x11-server-devel-1.20.11-49.oe2403sp4.aarch64.rpm xorg-x11-server-1.20.11-49.oe2403sp4.src.rpm xorg-x11-server-1.20.11-49.oe2403sp4.x86_64.rpm xorg-x11-server-Xdmx-1.20.11-49.oe2403sp4.x86_64.rpm xorg-x11-server-Xephyr-1.20.11-49.oe2403sp4.x86_64.rpm xorg-x11-server-Xnest-1.20.11-49.oe2403sp4.x86_64.rpm xorg-x11-server-Xvfb-1.20.11-49.oe2403sp4.x86_64.rpm xorg-x11-server-common-1.20.11-49.oe2403sp4.x86_64.rpm xorg-x11-server-debuginfo-1.20.11-49.oe2403sp4.x86_64.rpm xorg-x11-server-debugsource-1.20.11-49.oe2403sp4.x86_64.rpm xorg-x11-server-devel-1.20.11-49.oe2403sp4.x86_64.rpm xorg-x11-server-help-1.20.11-49.oe2403sp4.noarch.rpm xorg-x11-server-source-1.20.11-49.oe2403sp4.noarch.rpm A flaw was found in the X.Org X Server and XWayland. An error handling issue in the X Keyboard Extension (XKB) geometry processing fails to clear a memory pointer after an allocation failure, leading to a double-free condition during cleanup. A local user can exploit this vulnerability by sending a specially crafted request to the display server. This can cause memory corruption, potentially resulting in a Denial of Service (DoS) or arbitrary code execution with elevated privileges. (From Red Hat.) 2026-10-22 CVE-2026-88812 openEuler-24.03-LTS-SP4 High 7.8 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H xorg-x11-server security update 2026-10-22 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4471 A flaw was found in xorg-x11-server. A use-after-free vulnerability, where the application accesses memory after it has already been released, occurs in the Present extension because window notification entries are not properly unlinked before cleaning up window resources. An authenticated local X client can exploit this flaw by creating cross-window notifications and subsequently destroying the target window. Successful exploitation primarily results in a Denial of Service (DoS) via an X server crash, and may potentially lead to information disclosure. 2026-10-22 CVE-2026-93515 openEuler-24.03-LTS-SP4 Medium 6.1 AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H xorg-x11-server security update 2026-10-22 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4471 A flaw was found in xorg-x11-server. A local user can exploit a use-after-free condition—where the software attempts to access memory after it has been freed—by establishing a passive input grab and removing an input device. When subsequent input events are processed, the server dereferences the dangling device pointer. This flaw can lead to arbitrary code execution or a Denial of Service (DoS) via an X server crash. 2026-10-22 CVE-2026-93516 openEuler-24.03-LTS-SP4 High 7.8 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H xorg-x11-server security update 2026-10-22 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4471 A flaw was found in xorg-x11-server. The GLX (OpenGL Extension to the X Window System) interface fails to verify that incoming data sizes do not exceed allocated buffer limits when handling large rendering requests. An authenticated local client can exploit this vulnerability by sending a specially crafted request, triggering a heap-based buffer overflow. Successful exploitation can result in arbitrary code execution with the privileges of the X server or cause a Denial of Service (DoS) by crashing the application. (From Red Hat.) 2026-10-22 CVE-2026-93517 openEuler-24.03-LTS-SP4 High 7.8 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H xorg-x11-server security update 2026-10-22 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4471 A flaw was found in xorg-x11-server. Due to an integer truncation issue during memory allocation calculations within the X Keyboard Extension (XKB), the server allocates an undersized buffer when resizing key types. An authenticated local client can exploit this vulnerability by sending specially crafted XKB requests, causing a heap-based buffer overflow. This can result in arbitrary code execution or a denial of service (DoS). (From Red Hat.) 2026-10-22 CVE-2026-93518 openEuler-24.03-LTS-SP4 High 7.8 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H xorg-x11-server security update 2026-10-22 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4471 Input_constrain_cursor() writes barrier events into a fixed-size buffer without checking bounds. When more than 100 pointer barriers are active, the writes overflow the fixed buffer on the stack or heap. An authenticated X client can trigger this by creating more than 100 pointer barriers (using the XFIXES extension) and then generating pointer motion events (e.g. via XTEST). Both extensions are enabled by default. 2026-10-22 CVE-2026-93519 openEuler-24.03-LTS-SP4 High 7.8 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H xorg-x11-server security update 2026-10-22 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4471 A flaw was found in xorg-x11-server. In the X Keyboard Extension (XKB), key name memory is allocated with an insufficient buffer size compared to the maximum supported range. An authenticated local client can exploit this flaw by sending requests that modify the keycode range, triggering a heap-based buffer overflow. This vulnerability can lead to arbitrary code execution or cause a Denial of Service (DoS) by crashing the X server. 2026-10-22 CVE-2026-93520 openEuler-24.03-LTS-SP4 High 7.8 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H xorg-x11-server security update 2026-10-22 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4471 A flaw was found in xorg-x11-server. The X server incorrectly calculates buffer sizes and memory offsets when prepending or appending data to RandR (Resize and Rotate extension) provider properties. A local attacker can exploit this vulnerability by sending specially crafted property update requests, causing memory corruption. This flaw could allow an attacker to escalate privileges or cause a denial of service (DoS) by crashing the X server. 2026-10-22 CVE-2026-93521 openEuler-24.03-LTS-SP4 High 7.8 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H xorg-x11-server security update 2026-10-22 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4471 A flaw was found in xorg-x11-server. A local authenticated client can exploit this flaw by sending a crafted input device ungrab request with an unvalidated modifier value. This lack of validation causes the server to perform an out-of-bounds write on the heap, resulting in memory corruption that can lead to a denial of service (DoS) or potential arbitrary code execution. 2026-10-22 CVE-2026-93523 openEuler-24.03-LTS-SP4 High 7.8 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H xorg-x11-server security update 2026-10-22 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4471 A flaw was found in xorg-x11-server. An authenticated local user can trigger an out-of-bounds heap memory read by sending specially crafted X Keyboard Extension (XKB) requests with inconsistent key range parameters. This flaw leads to information disclosure, allowing the user to read sensitive data from the server's heap memory. 2026-10-22 CVE-2026-93524 openEuler-24.03-LTS-SP4 Low 3.3 AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N xorg-x11-server security update 2026-10-22 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4471