CVE-2025-49178

NameCVE-2025-49178
DescriptionA flaw was found in the X server's request handling. Non-zero 'bytes to ignore' in a client's request can cause the server to skip processing another client's request, potentially leading to a 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)
ReferencesDLA-4230-1, DSA-5947-1
Debian Bugs1108369

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
xorg-server (PTS)bullseye2:1.20.11-1+deb11u13vulnerable
bullseye (security)2:1.20.11-1+deb11u16fixed
bookworm2:21.1.7-3+deb12u9vulnerable
bookworm (security)2:21.1.7-3+deb12u10fixed
trixie, sid2:21.1.16-1.3fixed
xwayland (PTS)bookworm2:22.1.9-1vulnerable
trixie, sid2:24.1.6-1vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
xorg-serversourcebullseye2:1.20.11-1+deb11u16DLA-4230-1
xorg-serversourcebookworm2:21.1.7-3+deb12u10DSA-5947-1
xorg-serversource(unstable)2:21.1.16-1.2
xwaylandsource(unstable)(unfixed)1108369

Notes

[bookworm] - xwayland <ignored> (Minor issue; Xwayland shouldn't be running as root)
Fixed by: https://gitlab.freedesktop.org/xorg/xserver/-/commit/d55c54cecb5e83eaa2d56bed5cc4461f9ba318c2

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