Multiple vulnerabilities in X.Org X server and Xwayland

Published: 2025-06-17

Risk	Low
Patch available	YES
Number of vulnerabilities	6
CVE-ID	CVE-2025-49175 CVE-2025-49176 CVE-2025-49177 CVE-2025-49178 CVE-2025-49179 CVE-2025-49180
CWE-ID	CWE-125 CWE-190 CWE-200 CWE-399
Exploitation vector	Local
Public exploit	N/A
Vulnerable software	X.org Server Server applications / Other server solutions Xwayland Client/Desktop applications / Multimedia software
Vendor	X.org

Security Bulletin

This security bulletin contains information about 6 vulnerabilities.

1) Out-of-bounds read

EUVDB-ID: #VU111226

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-49175

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to a boundary condition in X Rendering extension (Animated cursors). A local user can trigger an out-of-bounds read error and read contents of memory on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

X.org Server: 21.0.99.1 - 21.1.16

Xwayland: 21.0.99.901 - 24.1.6

CPE2.3

External links

https://www.openwall.com/lists/oss-security/2025/06/17/3
https://gitlab.freedesktop.org/xorg/xserver/-/commit/0885e0b2

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Integer overflow

EUVDB-ID: #VU111227

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-49176

CWE-ID: CWE-190 - Integer overflow

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to integer overflow in Big Requests Extension. A local user can trigger an integer overflow and execute arbitrary code with elevated privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

X.org Server: 21.0.99.1 - 21.1.16

Xwayland: 21.0.99.901 - 24.1.6

CPE2.3

External links

https://www.openwall.com/lists/oss-security/2025/06/17/3
https://gitlab.freedesktop.org/xorg/xserver/-/commit/03731b32

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Information disclosure

EUVDB-ID: #VU111228

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-49177

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

Exploit availability: No

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to a data leak in XFIXES Extension 6 (XFixesSetClientDisconnectMode). A local user can gain access to sensitive information.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

X.org Server: 21.0.99.1 - 21.1.16

Xwayland: 21.0.99.901 - 24.1.6

CPE2.3

External links

https://www.openwall.com/lists/oss-security/2025/06/17/3
https://gitlab.freedesktop.org/xorg/xserver/-/commit/ab02fb96

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

4) Resource management error

EUVDB-ID: #VU111229

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-49178

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper management of internal resources within the application when handling client requests. A local user can perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

X.org Server: 1.12 - 21.1.16

Xwayland: 21.0.99.901 - 24.1.6

CPE2.3

External links

https://www.openwall.com/lists/oss-security/2025/06/17/3
https://gitlab.freedesktop.org/xorg/xserver/-/commit/d55c54ce

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

5) Integer overflow

EUVDB-ID: #VU111230

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-49179

CWE-ID: CWE-190 - Integer overflow

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to integer overflow within the RecordSanityCheckRegisterClients() function in in X Record extension. A local user can trigger an integer overflow and execute arbitrary code with elevated privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

X.org Server: 21.0.99.1 - 21.1.16

Xwayland: 21.0.99.901 - 24.1.6

CPE2.3

External links

https://www.openwall.com/lists/oss-security/2025/06/17/3
https://gitlab.freedesktop.org/xorg/xserver/-/commit/2bde9ca4

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

6) Integer overflow

EUVDB-ID: #VU111231

Risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-49180

CWE-ID: CWE-190 - Integer overflow

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to integer overflow within the RRChangeProviderProperty() function in RandR extension. A local user can trigger an integer overflow and execute arbitrary code with elevated privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

X.org Server: 1.17.0 - 21.1.16

Xwayland: 21.0.99.901 - 24.1.6

CPE2.3

External links

https://www.openwall.com/lists/oss-security/2025/06/17/3
https://gitlab.freedesktop.org/xorg/xserver/-/commit/3c3a4b76
https://gitlab.freedesktop.org/xorg/xserver/-/commit/0235121c

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.