X.Org xwayland/xorg-x11-server prior 24.1.15/21.1.26 XRes QueryResourceBytes Swap Path integer overflow

CVSS Meta Temp Score
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CTI Interest Score
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9.5$0-$5k0.65+

Summaryinfo

A vulnerability has been found in X.Org xwayland and xorg-x11-server and classified as very critical. This vulnerability affects unknown code of the component XRes QueryResourceBytes Swap Path. Performing a manipulation results in integer overflow. This vulnerability is known as CVE-2026-109094. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in X.Org xwayland and xorg-x11-server. It has been classified as very critical. This affects an unknown part of the component XRes QueryResourceBytes Swap Path. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A integer overflow that can lead to a buffer overrread in the XRes QueryResourceBytes Swap Path in the X.Org xwayland before 24.1.15 and X Server before 21.1.26 on 32bit systems could be used by authenticated clients to crash the X server.

It is possible to read the advisory at gitlab.freedesktop.org. This vulnerability is uniquely identified as CVE-2026-109094 since 10/12/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/13/2026).

Upgrading to version 24.1.15 or 21.1.26 eliminates this vulnerability. Applying the patch a59678e491a762e504829cac069cf37f4ccafe0d is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.5

VulDB Base Score: 9.9
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Integer overflow
CWE: CWE-190 / CWE-189
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: xwayland/xorg-x11-server 24.1.15/21.1.26
Patch: a59678e491a762e504829cac069cf37f4ccafe0d

Timelineinfo

10/12/2026 CVE reserved
11/13/2026 +32 days Advisory disclosed
11/13/2026 +0 days VulDB entry created
11/13/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: x.org

Advisory: gitlab.freedesktop.org
Status: Confirmed

CNA: suse
CVE: CVE-2026-109094 (🔒)

GCVE (CVE): GCVE-0-2026-109094
GCVE (VulDB): GCVE-100-437055

Entryinfo

Created: 11/13/2026 15:44
Changes: 11/13/2026 15:44 (67)
Complete: 🔍
Cache ID: 216::103

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