# xorg-server-source 2:21.1.16-1ubuntu1: xorg-server-source 2:21.1.16-1ubuntu1 for Ubuntu 25.10 (questing)

xorg-server-source 2:21.1.16-1ubuntu1, released February 25, 2025, fixes 8 CVEs in xorg-server-source. None of them is reported as exploited. Patch Radar priority: High. The product is no longer supported.

- Web page: https://patchblox.com/security/fix/linux/ubuntu-questing-xorg-server-source-2-21.1.16-1ubuntu1
- Platform: Linux
- Released: Feb 25, 2025
- Priority: High (Closes CVE-2025-26597, high severity)
- CVEs: 8, exploited: 0, on CISA KEV: 0

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [xorg-server-source](https://patchblox.com/security/data/product/linux/xorg-server-source.md) | Ubuntu 25.10 (questing) | 2:21.1.16-1ubuntu1 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2025-26597](https://patchblox.com/security/data/cve/CVE-2025-26597.md) | High | libX11: improper resizing of key actions when nGroups is 0 can lead to buffer overflows in | 7.8 | 0.0044 |  |
| [CVE-2025-26595](https://patchblox.com/security/data/cve/CVE-2025-26595.md) | High | libxkbfile: Fixed buffer overflow in XkbVModMaskText() (bsc#1237429). | 7.8 | 0.0044 |  |
| [CVE-2025-26596](https://patchblox.com/security/data/cve/CVE-2025-26596.md) | High | xorg-x11-server: Heap overflow in XkbWriteKeySyms() (bsc#1237430). | 7.8 | 0.0044 |  |
| [CVE-2025-26598](https://patchblox.com/security/data/cve/CVE-2025-26598.md) | High | xorg-x11-server: Out-of-bounds write in CreatePointerBarrierClient() (bsc#1237432). | 7.8 | 0.0041 |  |
| [CVE-2025-26599](https://patchblox.com/security/data/cve/CVE-2025-26599.md) | High | xwayland: Use of uninitialized pointer in compRedirectWindow() (bsc#1237433). | 7.8 | 0.0041 |  |
| [CVE-2025-26594](https://patchblox.com/security/data/cve/CVE-2025-26594.md) | High | xorg-x11-server: Use-after-free of the root cursor (bsc#1237427). | 7.8 | 0.0039 |  |
| [CVE-2025-26600](https://patchblox.com/security/data/cve/CVE-2025-26600.md) | High | xorg-x11-server: Use-after-free in PlayReleasedEvents() (bsc#1237434). | 7.8 | 0.0039 |  |
| [CVE-2025-26601](https://patchblox.com/security/data/cve/CVE-2025-26601.md) | High | xorg-x11-server: Use-after-free in SyncInitTrigger() (bsc#1237435). | 7.8 | 0.0039 |  |

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Data as of 2026-11-12T13:55:20Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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