CVE-2025-49178 — Improper Locking in Xwayland

CWE-667 — Improper LockingCWE-401 — Missing Release of Memory after Effective Lifetime10 documents8 sources
Severity
5.5MEDIUMNVD
EPSS
0.2%
top 58.94%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
X.org XwaylandX.org Xorg-server
Timeline
PublishedJun 17
Latest updateJun 18

Description

A 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.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitability: 1.8 | Impact: 3.6

Affected Packages3 packages

▶Debianx.org/xorg-server< 2:1.20.11-1+deb11u16+3
▶CVEListV5x.org/xwayland< 24.1.7
▶Debianx.org/xwayland< 2:24.1.8-1

🔴Vulnerability Details

3
GHSA
GHSA-69rm-w9qj-3x45: A flaw was found in the X server's request handling↗2025-06-17
▶
OSV
CVE-2025-49178: A flaw was found in the X server's request handling↗2025-06-17
▶
CVEList
Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: unprocessed client request due to bytes to ignore↗2025-06-17
▶

📋Vendor Advisories

6
Ubuntu
X.Org X Server vulnerabilities↗2025-06-18
▶
Ubuntu
X.Org X Server vulnerabilities↗2025-06-17
▶
Red Hat
xorg-x11-server-Xwayland: xorg-x11-server: tigervnc: Unprocessed Client Request Due to Bytes to Ignore↗2025-06-17
▶
Microsoft
Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: unprocessed client request due to bytes to ignore↗2025-06-10
▶
Microsoft
memstick/mspro_block: fix handling of read-only devices↗2025-02-11
▶
CVE-2025-49178 — Improper Locking in X.org Xwayland | cvebase