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Slackware xorg-server Critical Use-After-Free and Overflow Vuln 2026-189-03

slackware
Calendar Grey July 8, 2026
Dist Slackware Esm H88
New xorg-server packages for Slackware address critical security issues including buffer overflow and use-after-free defects.
New xorg-server packages are available for Slackware 15.0 and -current to fix security issues.

Summary

Here are the details from the Slackware 15.0 ChangeLog: patches/packages/xorg-server-1.20.14-i586-21_slack15.0.txz: Rebuilt. This update fixes security issues: glamor Font Atlas Heap Buffer Overflow. GLX contextTags Use-After-Free in CommonMakeCurrent(). For more information, see: https://lists.x.org/archives/xorg/2026-July/062255.html https://www.cve.org/CVERecord?id=CVE-2026-55999 https://www.cve.org/CVERecord?id=CVE-2026-56000 (* Security fix *) patches/packages/xorg-server-xephyr-1.20.14-i586-21_slack15.0.txz: Rebuilt. patches/packages/xorg-server-xnest-1.20.14-i586-21_slack15.0.txz: Rebuilt. patches/packages/xorg-server-xvfb-1.20.14-i586-21_slack15.0.txz: Rebuilt. patches/packages/xorg-server-xwayland-21.1.4-i586-19_slack15.0.txz: Rebuilt. This update fixes security issues: glamor Font Atlas Heap Buffer Overflow. GLX contextTags Use-After-Free in CommonMakeCurrent(). For more information, see:

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Topics%20covered

Topics Covered

security advisory security fix important slackware use-after-free glamor overflow

Where Find New Packages

Thanks to the friendly folks at the OSU Open Source Lab (http://osuosl.org) for donating FTP and rsync hosting to the Slackware project! :-)
Also see the "Get Slack" section on http://slackware.com for additional mirror sites near you.
Updated package for Slackware 15.0: ftp://ftp.slackware.com/pub/slackware/slackware-15.0/patches/packages/xorg-server-1.20.14-i586-21_slack15.0.txz ftp://ftp.slackware.com/pub/slackware/slackware-15.0/patches/packages/xorg-server-xephyr-1.20.14-i586-21_slack15.0.txz ftp://ftp.slackware.com/pub/slackware/slackware-15.0/patches/packages/xorg-server-xnest-1.20.14-i586-21_slack15.0.txz ftp://ftp.slackware.com/pub/slackware/slackware-15.0/patches/packages/xorg-server-xvfb-1.20.14-i586-21_slack15.0.txz ftp://ftp.slackware.com/pub/slackware/slackware-15.0/patches/packages/xorg-server-xwayland-21.1.4-i586-19_slack15.0.txz
Updated package for Slackware x86_64 15.0: ftp://ftp.slackware.com/pub/slackware/slackware64-15.0/patches/packages/xorg-server-1.20.14-x86...

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MD5 Signatures

Slackware 15.0 package: 8ee8e09c8bf7ad2f7736e0b3a34526fa xorg-server-1.20.14-i586-21_slack15.0.txz 9445a8151fcef066aab50f6889d9020e xorg-server-xephyr-1.20.14-i586-21_slack15.0.txz 3410bdb7f3dad90a39739ff1f6eeac31 xorg-server-xnest-1.20.14-i586-21_slack15.0.txz 478ab900a8bf22df2ef173cfdefbabbb xorg-server-xvfb-1.20.14-i586-21_slack15.0.txz a132025f9509f12a96a8b374ed257496 xorg-server-xwayland-21.1.4-i586-19_slack15.0.txz
Slackware x86_64 15.0 package: 1c85ac7c5d1033fc41354b33fe18bdcd xorg-server-1.20.14-x86_64-21_slack15.0.txz 5f03471488a9b6bf826b9ab1bdc2d4c2 xorg-server-xephyr-1.20.14-x86_64-21_slack15.0.txz 4d5bc9fcf635f9bc0dccdf11da884afc xorg-server-xnest-1.20.14-x86_64-21_slack15.0.txz 17a79b491be51e4730ae417116cc51d2 xorg-server-xvfb-1.20.14-x86_64-21_slack15.0.txz a150bb8ba91cf5c9013602ef583cc120 xorg-server-xwayland-21.1.4-x86_64-19_slack15.0.txz
Slackware -current package: 3a6b1e86333ef9653b4982d653d5d8b7 x/xorg-server-21.1.24-i686-1.txz 17b3c4516dff4c42231a1b2eeca9fbdc x/xorg-server-xephyr-21.1.24-i686-1.txz c998ffd8de120deec1dcfd12117d3bbb x/xorg-server-xnest-21.1.24-i686-1.txz 590199de49ccdb9e55bfe323996e4178 x/xorg-server-xvfb-21.1.24-i686-1.txz d0b18dca7a226e9a606c8e199c5b0b15 x/xorg-server-xwayland-24.1.13-i686-1.txz
Slackware x86_64 -current package: 9eb2c4a86ccaff313b51b2be39d443b1 x/xorg-server-21.1.24-x86_64-1.txz 744a967005e978277b9638bf6b6b5acf x/xorg-server-xephyr-21.1.24-x86_64-1.txz eb49ee6f09618a0649d6e75e81499fa9 x/xorg-server-xnest-21.1.24-x86_64-1.txz b216eac69f4f7dac6e521e4be4904171 x/xorg-server-xvfb-21.1.24-x86_64-1.txz 193b4f96655202b5002bbfbcde68975b x/xorg-server-xwayland-24.1.13-x86_64-1.txz

Severity
important
Lowest
Low
Medium
High
Critical

Topics%20covered

Topics Covered

security advisory security fix important slackware use-after-free glamor overflow

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Installation Instructions

Installation instructions: Upgrade the package as root: # upgradepkg xorg-server-*.txz