DescriptionA use-after-free flaw was found in xorg-x11-server-Xvfb. This issue occurs in Xvfb with a very specific and legacy configuration (a multi-screen setup with multiple protocol screens, also known as Zaphod mode). If the pointer is warped from a screen 1 to a screen 0, a use-after-free issue may be triggered during shutdown or reset of the Xvfb server, allowing for possible escalation of privileges or denial of service.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs1055426

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
xorg-server (PTS)bullseye (security), bullseye2:1.20.11-1+deb11u13vulnerable
bookworm, bookworm (security)2:21.1.7-3+deb12u7vulnerable
sid, trixie2:21.1.12-1vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


[bookworm] - xorg-server <no-dsa> (Minor issue)
[bullseye] - xorg-server <no-dsa> (Minor issue)
[buster] - xorg-server <no-dsa> (Minor issue)

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