RLSA-2026:26562

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Source
https://errata.rockylinux.org/RLSA-2026:26562
Import Source
https://storage.googleapis.com/resf-osv-data/RLSA-2026:26562.json
JSON Data
https://api.osv.dev/v1/vulns/RLSA-2026:26562
Upstream
  • CVE-2026-50256
  • CVE-2026-50257
  • CVE-2026-50258
  • CVE-2026-50259
  • CVE-2026-50260
  • CVE-2026-50261
  • CVE-2026-50262
  • CVE-2026-50263
  • CVE-2026-50264
Published
2026-06-19T00:01:03.263594Z
Modified
2026-06-19T00:30:04.746434482Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
Important: xorg-x11-server-Xwayland security, bug fix, and enhancement update
Details

Xwayland is an X server for running X clients under Wayland.

Security Fix(es):

  • 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)

  • xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence() (CVE-2026-50257)

  • 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)

  • xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB SetMap request via mapWidths indexing (CVE-2026-50259)

  • xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in FreeCounter() (CVE-2026-50260)

  • xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in SyncChangeCounter() (CVE-2026-50261)

  • xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX ChangeDrawableAttributes (CVE-2026-50262)

  • xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in CreateSaverWindow() (CVE-2026-50263)

  • xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2 DRIGetBuffers/DRIGetBuffersWithFormat (CVE-2026-50264)

Bug Fix(es) and Enhancement(s):

  • [xwayland] Backport other security fixes without a CVE assigned [rhel-8.10.z] (JIRA:Rocky Linux-184293)

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
Credits
    • Rocky Enterprise Software Foundation
    • Red Hat

Affected packages

Rocky Linux:8 / xorg-x11-server-Xwayland

Package

Name
xorg-x11-server-Xwayland
Purl
pkg:rpm/rocky-linux/xorg-x11-server-Xwayland?distro=rocky-linux-8&epoch=0

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0:21.1.3-20.el8_10.2
Database specific 
{
    "yum_repository": "AppStream"
}

Database specific

source 
"https://storage.googleapis.com/resf-osv-data/RLSA-2026:26562.json"