🛡️ CVE-2025-26595 on Ubuntu — xorg-server

Distribution advisory

This page covers CVE-2025-26595 as tracked by Ubuntu, for the package xorg-server. The fix is available in version 2:21.1.16-1ubuntu1; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

• Attack vector: Local — a local account, shell or session on the host is needed.
• Attack complexity: Low — the attack works reliably, with no preparation.
• Privileges required: Low — an ordinary user account is enough.
• User interaction: None — nobody has to be tricked into anything.
• Scope: Unchanged — the damage stays inside the vulnerable component.
• Confidentiality impact: High — total loss, or loss the attacker controls.
• Integrity impact: High — total loss, or loss the attacker controls.
• Availability impact: High — total loss, or loss the attacker controls.

Weakness class

UBUNTU-CVE-2025-26595 is classified as CWE-121: Stack-based Buffer Overflow. An oversized write to a stack buffer overwrites saved state such as return addresses, which can redirect execution.

Affected software

UBUNTU-CVE-2025-26595 is recorded against 4 packages.

• xorg-server (fixed in 2:21.1.16-1ubuntu1)
• xorg-server-hwe-16.04 (fixed in 2:1.19.6-1ubuntu4.1~16.04.6+esm9)
• xorg-server-hwe-18.04 (fixed in 2:1.20.8-2ubuntu2.2~18.04.11+esm4)
• xwayland (fixed in 2:23.2.6-1ubuntu0.4)

Timeline and source

Published on 25 February 2025 and last revised on 22 April 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Report)
www.cve.org (Report)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)
ubuntu.com (Advisory)

Other advisories for this package

xorg-server has other advisories on record. If you are patching this one, these are worth checking on the same host:

• MINI-vjc5-v4c4-7m8j (published 3 Aug 2026)
• MINI-hjrj-wf9r-7fw7 (published 2 Aug 2026)
• MINI-hrxv-85wg-q596 (published 29 Jul 2026)
• CGA-6cmx-33gr-3pwj (published 29 Jul 2026)
• CGA-pfg2-hxgv-rfj5 (published 29 Jul 2026)
• DEBIAN-CVE-2026-55999 (published 8 Jul 2026)
• UBUNTU-CVE-2026-56000 (published 8 Jul 2026)
• BELL-CVE-2026-56000 (published 8 Jul 2026)

Same weakness in other software

These advisories are the same class of weakness (CWE-121: Stack-based Buffer Overflow) in other software:

• CVE-2023-28760 (7.5 High, published 2 Oct 2025)
• CVE-2022-32502 (6.3 Medium, published 14 May 2024)
• CVE-2023-27332 (8.8 High, published 3 May 2024)
• CVE-2023-32144 (8.8 High, published 3 May 2024)
• CVE-2023-27369 (8.8 High, published 3 May 2024)
• CVE-2023-32142 (8.8 High, published 3 May 2024)
• CVE-2023-27368 (8.8 High, published 3 May 2024)
• CVE-2023-32141 (8.8 High, published 3 May 2024)

CVE-2025-26595 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Affected Packages

References