Fixed packages 7
| Release | Package | Fixed in |
|---|---|---|
| Red Hat · RHEL 9 enterprise_linux:9::appstream | xorg-x11-server-Xwayland | 0:24.1.9-4.el9_8.3 |
| Red Hat · RHEL 9 enterprise_linux:9::appstream | xorg-x11-server-Xwayland-debuginfo | 0:24.1.9-4.el9_8.3 |
| Red Hat · RHEL 9 enterprise_linux:9::appstream | xorg-x11-server-Xwayland-debugsource | 0:24.1.9-4.el9_8.3 |
| Red Hat · RHEL 9 enterprise_linux:9::crb | xorg-x11-server-Xwayland | 0:24.1.9-4.el9_8.3 |
| Red Hat · RHEL 9 enterprise_linux:9::crb | xorg-x11-server-Xwayland-debuginfo | 0:24.1.9-4.el9_8.3 |
| Red Hat · RHEL 9 enterprise_linux:9::crb | xorg-x11-server-Xwayland-debugsource | 0:24.1.9-4.el9_8.3 |
| Red Hat · RHEL 9 enterprise_linux:9::crb | xorg-x11-server-Xwayland-devel | 0:24.1.9-4.el9_8.3 |
Vulnerabilities 2
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Critical 9.0
xorg-x11-server / xwayland GLX contextTags Use-After-Free in CommonMakeCurrent()
Local attackers with a X connection able to provide GLX commit to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a Heap Use After Free, due to CommonMakeCurrent() pointing into potentially reallocated memory.
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High 8.5
xorg-server / xwayland glamor font atlas Heap Buffer Overflow
Local attackers with a X connection able to provide PCX fonts to the X server xorg-server before 21.2.24 and xwayland before 24.1.13 could cause a heap buffer overflow via SetFont due to missing glyph boundary checks.
References
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article
https://access.redhat.com/security/updates/classification/#important
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2496165
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2496193
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advisory
https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_38490.json
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report
https://access.redhat.com/security/cve/CVE-2026-55999
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advisory
https://www.cve.org/CVERecord?id=CVE-2026-55999
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advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-55999
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report
https://access.redhat.com/security/cve/CVE-2026-56000
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advisory
https://www.cve.org/CVERecord?id=CVE-2026-56000
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advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-56000