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Slackware 15.0 xorg-server Critical Buffer Overflow Issues Fix 2026-154-04

slackware
Calendar Grey June 3, 2026
Dist Slackware Esm H88
New xorg-server packages for Slackware fix multiple security issues including buffer overflows and use-after-free.
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-i586-20_slack15.0.txz: Rebuilt. This update fixes security issues: Font Alias Stack-based Buffer Overflow. XSYNC Use-After-Free in miSyncDestroyFence(). XKB Key Types Stack-based Buffer Overflow. XKB SetMap Request Stack-based Buffer Overflow. XSYNC Use-After-Free in FreeCounter(). XSYNC Use-After-Free in SyncChangeCounter(). GLX ChangeDrawableAttributes Out-Of-Bounds Read/Write. CreateSaverWindow Use-After-Free Information Disclosure. DRI2 DRIGetBuffers/DRIGetBuffersWithFormat Out-Of-Bounds Write. For more information, see: https://lists.x.org/archives/xorg/2026-June/062239.html Zero Day Initiative identifiers: ZDI-CAN-30136 ZDI-CAN-30159 ZDI-CAN-30160 ZDI-CAN-30161 ZDI-CAN-30163 ZDI-CAN-30164 ZDI-CAN-30165 ZDI-CAN-30168 (* Security fix *) patches/packages/xorg-server-xephyr-1.20.14-i586-20_slack15.0.txz:

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Topics%20covered

Topics Covered

security advisory buffer overflow slackware information disclosure Xorg use-after-free

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-i586-20_slack15.0.txz ftp://ftp.slackware.com/pub/slackware/slackware-15.0/patches/packages/xorg-server-xephyr-1.20.14-i586-20_slack15.0.txz ftp://ftp.slackware.com/pub/slackware/slackware-15.0/patches/packages/xorg-server-xnest-1.20.14-i586-20_slack15.0.txz ftp://ftp.slackware.com/pub/slackware/slackware-15.0/patches/packages/xorg-server-xvfb-1.20.14-i586-20_slack15.0.txz ftp://ftp.slackware.com/pub/slackware/slackware-15.0/patches/packages/xorg-server-xwayland-21.1.4-i586-18_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: cbfac0caca2fc2edd2228b857c15e2e9 xorg-server-1.20.14-i586-20_slack15.0.txz 989c3361e90dfd378821ea34e7751260 xorg-server-xephyr-1.20.14-i586-20_slack15.0.txz 06dd4ee0ce1689ee00e14b1766b31d5e xorg-server-xnest-1.20.14-i586-20_slack15.0.txz 2b1ed9bb753576011b1106d1d23b4321 xorg-server-xvfb-1.20.14-i586-20_slack15.0.txz 7f0369f809d460fc7dc1f6ea670fa3a3 xorg-server-xwayland-21.1.4-i586-18_slack15.0.txz
Slackware x86_64 15.0 package: 3549b9c524b4b2436be6e2e98a8bda08 xorg-server-1.20.14-x86_64-20_slack15.0.txz 46ee24c23d38fbb0553887380af8084b xorg-server-xephyr-1.20.14-x86_64-20_slack15.0.txz 83664609d51c656ce0de22db26b39a6f xorg-server-xnest-1.20.14-x86_64-20_slack15.0.txz 033150aaba698c643a1e83603fc954ce xorg-server-xvfb-1.20.14-x86_64-20_slack15.0.txz 7bb0e6fec7dd96f690a8a5da3d71fcc7 xorg-server-xwayland-21.1.4-x86_64-18_slack15.0.txz
Slackware -current package: e3593e978a2b547489ef619c7f43418e x/xorg-server-21.1.23-i686-1.txz cd72be47541994bc4daa892ce24b0822 x/xorg-server-xephyr-21.1.23-i686-1.txz aa77f9979ebfc4695dd065b819e34c94 x/xorg-server-xnest-21.1.23-i686-1.txz bebb97459412a7756dec668d20175f40 x/xorg-server-xvfb-21.1.23-i686-1.txz 9b89c94db354f501cce09a88458996c4 x/xorg-server-xwayland-24.1.12-i686-1.txz
Slackware x86_64 -current package: 192a9167288aab1a1cd01b853195e22f x/xorg-server-21.1.23-x86_64-1.txz 1c4cace35ff4c181ced324d04072d1c9 x/xorg-server-xephyr-21.1.23-x86_64-1.txz 079fe68315de3bf3fe8ed4474b4f6ca1 x/xorg-server-xnest-21.1.23-x86_64-1.txz e8370dae55b2d59f4e8b10e707c9ac2a x/xorg-server-xvfb-21.1.23-x86_64-1.txz 631bad1a1d891e2f48224ad25a40d00f x/xorg-server-xwayland-24.1.12-x86_64-1.txz

Severity
critical
Lowest
Low
Medium
High
Critical

Topics%20covered

Topics Covered

security advisory buffer overflow slackware information disclosure Xorg use-after-free

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Installation Instructions

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

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