A use-after-free vulnerability was found in the ProcRenderAddGlyphs() function of Xorg servers. This issue occurs when AllocateGlyph() is called to store new glyphs sent by the client to the X server, potentially resulting in multiple entries pointing to the same non-refcounted glyphs. Consequently, ProcRenderAddGlyphs() may free a glyph, leading to a use-after-free scenario when the same glyph pointer is subsequently accessed. This flaw allows an authenticated attacker to execute arbitrary code on the system by sending a specially crafted request.
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION | RedHat | tigervnc-0:1.1.0-25.el6_10.13 | * |
| Red Hat Enterprise Linux 7 | RedHat | xorg-x11-server-0:1.20.4-29.el7_9 | * |
| Red Hat Enterprise Linux 7 | RedHat | tigervnc-0:1.8.0-33.el7_9 | * |
| Red Hat Enterprise Linux 8 | RedHat | tigervnc-0:1.13.1-2.el8_9.10 | * |
| Red Hat Enterprise Linux 8 | RedHat | xorg-x11-server-0:1.20.11-23.el8_10 | * |
| Red Hat Enterprise Linux 8 | RedHat | tigervnc-0:1.13.1-10.el8_10 | * |
| Red Hat Enterprise Linux 8 | RedHat | xorg-x11-server-Xwayland-0:21.1.3-16.el8_10 | * |
| Red Hat Enterprise Linux 8.2 Advanced Update Support | RedHat | tigervnc-0:1.9.0-15.el8_2.11 | * |
| Red Hat Enterprise Linux 8.2 Telecommunications Update Service | RedHat | tigervnc-0:1.9.0-15.el8_2.11 | * |
| Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions | RedHat | tigervnc-0:1.9.0-15.el8_2.11 | * |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | RedHat | tigervnc-0:1.11.0-8.el8_4.10 | * |
| Red Hat Enterprise Linux 8.4 Telecommunications Update Service | RedHat | tigervnc-0:1.11.0-8.el8_4.10 | * |
| Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions | RedHat | tigervnc-0:1.11.0-8.el8_4.10 | * |
| Red Hat Enterprise Linux 8.6 Extended Update Support | RedHat | tigervnc-0:1.12.0-6.el8_6.11 | * |
| Red Hat Enterprise Linux 8.8 Extended Update Support | RedHat | tigervnc-0:1.12.0-15.el8_8.10 | * |
| Red Hat Enterprise Linux 9 | RedHat | tigervnc-0:1.13.1-8.el9_4.3 | * |
| Red Hat Enterprise Linux 9 | RedHat | xorg-x11-server-Xwayland-0:23.2.7-1.el9 | * |
| Red Hat Enterprise Linux 9 | RedHat | xorg-x11-server-0:1.20.11-26.el9 | * |
| Red Hat Enterprise Linux 9.0 Extended Update Support | RedHat | tigervnc-0:1.11.0-22.el9_0.11 | * |
| Red Hat Enterprise Linux 9.2 Extended Update Support | RedHat | tigervnc-0:1.12.0-14.el9_2.8 | * |
| Xorg-server | Ubuntu | devel | * |
| Xorg-server | Ubuntu | esm-infra-legacy/trusty | * |
| Xorg-server | Ubuntu | esm-infra/bionic | * |
| Xorg-server | Ubuntu | esm-infra/focal | * |
| Xorg-server | Ubuntu | esm-infra/xenial | * |
| Xorg-server | Ubuntu | focal | * |
| Xorg-server | Ubuntu | jammy | * |
| Xorg-server | Ubuntu | mantic | * |
| Xorg-server | Ubuntu | noble | * |
| Xorg-server | Ubuntu | oracular | * |
| Xorg-server | Ubuntu | plucky | * |
| Xorg-server | Ubuntu | trusty/esm | * |
| Xwayland | Ubuntu | jammy | * |
| Xwayland | Ubuntu | mantic | * |