CVE-2026-93516: Important · xorg-x11-server security update
Affects xorg-x11-server-XdmxSource GCVE Database
Mentioned vulnerabilities
Not known to be exploited : upgrade to 1.20.11-28.el8_10.5 when convenient.
Data as of 26 Oct 2026, 15:55 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- Patch
- Available – fixed in 1.20.11-28.el8_10.5
Exploitation evidence
Disclosed: evidence found.
CVE published 26 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade the AlmaLinux to 1.20.11-28.el8_10.5.
Patches and advisories
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| AlmaLinux 8xorg-x11-server-Xdmx | Affected
| Fixed in
|
| AlmaLinux 8xorg-x11-server-Xephyr | Affected
| Fixed in
|
| AlmaLinux 8xorg-x11-server-Xnest | Affected
| Fixed in
|
| AlmaLinux 8xorg-x11-server-Xorg | Affected
| Fixed in
|
| AlmaLinux 8xorg-x11-server-Xvfb | Affected
| Fixed in
|
| AlmaLinux 8xorg-x11-server-common | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
Description
X.Org is an open-source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical user interfaces are designed upon. Security Fix(es): * xorg-x11-server: xorg-x11-server: Arbitrary code execution via use-after-free in passive grab handling (CVE-2026-93516) * xorg-x11-server: xorg-x11-server: Privilege escalation via crafted RandR provider property requests (CVE-2026-93521) * xorg-x11-server: xwayland: xorg-x11-server: Arbitrary code execution via double-free in XKB geometry handling (CVE-2026-88812) * xorg-x11-server: xorg-x11-server: Out-of-bounds write via unvalidated modifier in ProcXIPassiveUngrabDevice (CVE-2026-93523) * xorg-x11-server: xorg-x11-server: arbitrary code execution via GLX RenderLarge heap-based buffer overflow (CVE-2026-93517) * xorg-x11-server: xorg-x11-server: arbitrary code execution via integer truncation during keyboard mapping resize (CVE-2026-93518) * xorg-x11-server: xorg-x11-server: Arbitrary code execution via buffer overflow in input_constrain_cursor() (CVE-2026-93519) * xorg-x11-server: xorg-x11-server: arbitrary code execution via out-of-bounds write in XKB keycode handling (CVE-2026-93520) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
References
- access.redhat.com/errata/RHSA-2026:89747 (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-88812 (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-93516 (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-93517 (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-93518 (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-93519 (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-93520 (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-93521 (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-93523 (opens in a new tab)
- bugzilla.redhat.com/2545161 (opens in a new tab)
- bugzilla.redhat.com/2545164 (opens in a new tab)
- bugzilla.redhat.com/2545174 (opens in a new tab)
- bugzilla.redhat.com/2545177 (opens in a new tab)
- bugzilla.redhat.com/2545246 (opens in a new tab)
- bugzilla.redhat.com/2545860 (opens in a new tab)
- bugzilla.redhat.com/2545887 (opens in a new tab)
- bugzilla.redhat.com/2545908 (opens in a new tab)
- errata.almalinux.org/8/ALSA-2026-89747.html (opens in a new tab)