Fixed packages 6
| Release | Package | Fixed in |
|---|---|---|
| Red Hat · RHEL 8.8 E4S rhel_e4s:8.8::appstream | xorg-x11-server-Xwayland | 0:21.1.3-13.el8_8 |
| Red Hat · RHEL 8.8 E4S rhel_e4s:8.8::appstream | xorg-x11-server-Xwayland-debuginfo | 0:21.1.3-13.el8_8 |
| Red Hat · RHEL 8.8 E4S rhel_e4s:8.8::appstream | xorg-x11-server-Xwayland-debugsource | 0:21.1.3-13.el8_8 |
| Red Hat · RHEL 8.8 TUS rhel_tus:8.8::appstream | xorg-x11-server-Xwayland | 0:21.1.3-13.el8_8 |
| Red Hat · RHEL 8.8 TUS rhel_tus:8.8::appstream | xorg-x11-server-Xwayland-debuginfo | 0:21.1.3-13.el8_8 |
| Red Hat · RHEL 8.8 TUS rhel_tus:8.8::appstream | xorg-x11-server-Xwayland-debugsource | 0:21.1.3-13.el8_8 |
Vulnerabilities 5
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High 7.8
Xorg: xwayland: x.org x server: denial of service via integer underflow in xkb compatibility map handling
A flaw was found in the X.Org X server. This integer underflow vulnerability, specifically in the XKB compatibility map handling, allows an attacker with local or remote X11 server access to trigger a buffer read overrun. This can lead to memory-safety violat…
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High 7.8
Xorg: xwayland: x.org x server: use-after-free vulnerability leads to server crash and potential memory corruption
A flaw was found in the X.Org X server. This use-after-free vulnerability occurs in the XSYNC fence triggering logic, specifically within the miSyncTriggerFence() function. An attacker with access to the X11 server can exploit this without user interaction, l…
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High 7.8
Xorg: xwayland: x.org x server: information exposure and denial of service via out-of-bounds memory access
A flaw was found in the X.Org X server's XKB key types request validation. A local attacker could send a specially crafted request to the X server, leading to an out-of-bounds memory access vulnerability. This could result in the disclosure of sensitive infor…
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Medium 6.1
Xwayland: xorg: x.org x server: information disclosure and denial of service via out-of-bounds read in xkb geometry processing.
A flaw was found in the X.Org X server. This out-of-bounds read vulnerability in the XKB geometry processing, specifically within the `CheckSetGeom()` and `XkbAddGeomKeyAlias` functions, allows an attacker to read uninitialized or out-of-bounds memory. An att…
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Medium 6.1
Xorg: xwayland: x.org x server: information disclosure or denial of service via out-of-bounds read in xkb modifier map handling
A flaw was found in the X.Org X server. This vulnerability, an out-of-bounds read, affects the XKB (X Keyboard Extension) modifier map handling. An attacker with access to the X11 server can exploit this by sending a malformed request, which causes the server…
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=2451106
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2451107
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2451109
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2451112
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2451113
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advisory
https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_21712.json
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report
https://access.redhat.com/security/cve/CVE-2026-33999
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advisory
https://www.cve.org/CVERecord?id=CVE-2026-33999
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advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-33999
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report
https://access.redhat.com/security/cve/CVE-2026-34000
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advisory
https://www.cve.org/CVERecord?id=CVE-2026-34000
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advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-34000
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report
https://access.redhat.com/security/cve/CVE-2026-34001
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advisory
https://www.cve.org/CVERecord?id=CVE-2026-34001
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advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-34001
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report
https://access.redhat.com/security/cve/CVE-2026-34002
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advisory
https://www.cve.org/CVERecord?id=CVE-2026-34002
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advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-34002
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report
https://access.redhat.com/security/cve/CVE-2026-34003
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advisory
https://www.cve.org/CVERecord?id=CVE-2026-34003
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advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-34003