Summary
Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: CVE-2026-34003: XKB Buffer overflow in CheckKeyTypes() CVE-2026-34002: XKB Out-of-bounds read in CheckModifierMap() CVE-2026-34001: XSYNC Use-after-free in miSyncTriggerFence() CVE-2026-34000: XKB Out-of-bounds Read in CheckSetGeom() CVE-2026-33999: XKB Integer Underflow in XkbSetCompatMap()
Fixed packages 13
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux · 2023 | xorg-x11-server-common | 0:21.1.13-5.amzn2023.0.9 |
| Amazon Linux · 2023 | xorg-x11-server-debuginfo | 0:21.1.13-5.amzn2023.0.9 |
| Amazon Linux · 2023 | xorg-x11-server-debugsource | 0:21.1.13-5.amzn2023.0.9 |
| Amazon Linux · 2023 | xorg-x11-server-devel | 0:21.1.13-5.amzn2023.0.9 |
| Amazon Linux · 2023 | xorg-x11-server-source | 0:21.1.13-5.amzn2023.0.9 |
| Amazon Linux · 2023 | xorg-x11-server-Xephyr | 0:21.1.13-5.amzn2023.0.9 |
| Amazon Linux · 2023 | xorg-x11-server-Xephyr-debuginfo | 0:21.1.13-5.amzn2023.0.9 |
| Amazon Linux · 2023 | xorg-x11-server-Xnest | 0:21.1.13-5.amzn2023.0.9 |
| Amazon Linux · 2023 | xorg-x11-server-Xnest-debuginfo | 0:21.1.13-5.amzn2023.0.9 |
| Amazon Linux · 2023 | xorg-x11-server-Xorg | 0:21.1.13-5.amzn2023.0.9 |
| Amazon Linux · 2023 | xorg-x11-server-Xorg-debuginfo | 0:21.1.13-5.amzn2023.0.9 |
| Amazon Linux · 2023 | xorg-x11-server-Xvfb | 0:21.1.13-5.amzn2023.0.9 |
| Amazon Linux · 2023 | xorg-x11-server-Xvfb-debuginfo | 0:21.1.13-5.amzn2023.0.9 |
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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web
https://alas.aws.amazon.com/cve/html/CVE-2026-33999.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-34000.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-34001.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-34002.html
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web
https://alas.aws.amazon.com/cve/html/CVE-2026-34003.html