CVE-2025-26601

Publication date 25 February 2025

Last updated 19 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.8 · High

Score breakdown

Description

A use-after-free flaw was found in X.Org and Xwayland. When changing an alarm, the values of the change mask are evaluated one after the other, changing the trigger values as requested, and eventually, SyncInitTrigger() is called. If one of the changes triggers an error, the function will return early, not adding the new sync object, possibly causing a use-after-free when the alarm eventually triggers.

Read the notes from the security team

Status

Package Ubuntu Release Status
xorg 26.10 stonking
Not affected
26.04 LTS resolute
Not affected
25.10 questing
Not affected
25.04 plucky
Not affected
24.10 oracular
Not affected
24.04 LTS noble
Not affected
22.04 LTS jammy
Not affected
20.04 LTS focal
Not affected
18.04 LTS bionic
Not affected
16.04 LTS xenial
Not affected
xorg-server 26.10 stonking
Fixed in 2:21.1.16-1ubuntu1
26.04 LTS resolute
Fixed in 2:21.1.16-1ubuntu1
25.10 questing
Fixed in 2:21.1.16-1ubuntu1
25.04 plucky
Fixed in 2:21.1.16-1ubuntu1
24.10 oracular
Fixed in 2:21.1.13-2ubuntu1.2
24.04 LTS noble
Fixed in 2:21.1.12-1ubuntu1.2
22.04 LTS jammy
Fixed in 2:21.1.4-2ubuntu1.7~22.04.13
20.04 LTS focal
Fixed in 2:1.20.13-1ubuntu1~20.04.19
18.04 LTS bionic
Fixed in 2:1.19.6-1ubuntu4.15+esm12
16.04 LTS xenial
Fixed in 2:1.18.4-0ubuntu0.12+esm17
14.04 LTS trusty
Needs evaluation
xwayland 26.10 stonking
Fixed in 2:24.1.5-1ubuntu1
26.04 LTS resolute
Fixed in 2:24.1.5-1ubuntu1
25.10 questing
Fixed in 2:24.1.5-1ubuntu1
25.04 plucky
Fixed in 2:24.1.5-1ubuntu1
24.10 oracular
Fixed in 2:24.1.2-1ubuntu0.4
24.04 LTS noble
Fixed in 2:23.2.6-1ubuntu0.4
22.04 LTS jammy
Fixed in 2:22.1.1-1ubuntu0.17
20.04 LTS focal Not in release
xorg-server-hwe-16.04 26.10 stonking Not in release
26.04 LTS resolute Not in release
25.10 questing Not in release
25.04 plucky Not in release
24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal Not in release
16.04 LTS xenial
Fixed in 2:1.19.6-1ubuntu4.1~16.04.6+esm9
xorg-server-hwe-18.04 26.10 stonking Not in release
26.04 LTS resolute Not in release
25.10 questing Not in release
25.04 plucky Not in release
24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Fixed in 2:1.20.8-2ubuntu2.2~18.04.11+esm4
xorg-hwe-16.04 26.10 stonking Not in release
26.04 LTS resolute Not in release
25.10 questing Not in release
25.04 plucky Not in release
24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal Not in release
16.04 LTS xenial
Not affected
xorg-hwe-18.04 26.10 stonking Not in release
26.04 LTS resolute Not in release
25.10 questing Not in release
25.04 plucky Not in release
24.10 oracular Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
20.04 LTS focal Not in release
18.04 LTS bionic
Not affected

Get expanded security coverage with Ubuntu Pro

Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use.

Get Ubuntu Pro 30-day free trial

Notes

mdeslaur

xorg server is actually the xorg-server package the xorg package only contains docs xwayland package contains parts of xorg-server

Severity score breakdown

CVSS version: CVSS v3.0

Base score 7.8 · High

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-7299-1
    • X.Org X Server vulnerabilities
    • 25 February 2025
    • USN-7299-2
    • X.Org X Server vulnerabilities
    • 10 March 2025
    • USN-7299-4
    • X.Org X Server regression
    • 17 March 2025

Other references

Access our resources on patching vulnerabilities