CVE-2025-26595
Xorg: xwayland: buffer overflow in xkbvmodmasktext()
Severity Score
7.8
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
0
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
Track*
*SSVC
Descriptions
A buffer overflow flaw was found in X.Org and Xwayland. The code in XkbVModMaskText() allocates a fixed-sized buffer on the stack and copies the names of the virtual modifiers to that buffer. The code fails to check the bounds of the buffer and would copy the data regardless of the size.
This vulnerability allows local attackers to escalate privileges on affected installations of X.Org Server. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.
The specific flaw exists within the XkbVModMaskText function. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a stack-based buffer. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of root.
Jan-Niklas Sohn discovered several vulnerabilities in the Xorg X server, which may result in privilege escalation if the X server is running privileged.
*Credits:
Jan-Niklas Sohn
CVSS Scores
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Authentication
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:Track*
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2025-02-12 CVE Reserved
- 2025-02-25 CVE Published
- 2025-05-22 CVE Updated
- 2025-06-27 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-121: Stack-based Buffer Overflow
CAPEC
References (16)
| URL | Tag | Source |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2025-26595 | 2025-02-25 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2345257 | 2025-02-25 | |
| https://access.redhat.com/errata/RHSA-2025:2500 | 2025-05-22 | |
| https://access.redhat.com/errata/RHSA-2025:2502 | 2025-05-22 | |
| https://access.redhat.com/errata/RHSA-2025:2861 | 2025-05-22 | |
| https://access.redhat.com/errata/RHSA-2025:2862 | 2025-05-22 | |
| https://access.redhat.com/errata/RHSA-2025:2865 | 2025-05-22 | |
| https://access.redhat.com/errata/RHSA-2025:2866 | 2025-05-22 | |
| https://access.redhat.com/errata/RHSA-2025:2873 | 2025-05-22 | |
| https://access.redhat.com/errata/RHSA-2025:2874 | 2025-05-22 | |
| https://access.redhat.com/errata/RHSA-2025:2875 | 2025-05-22 | |
| https://access.redhat.com/errata/RHSA-2025:2879 | 2025-05-22 | |
| https://access.redhat.com/errata/RHSA-2025:2880 | 2025-05-22 | |
| https://access.redhat.com/errata/RHSA-2025:7163 | 2025-05-22 | |
| https://access.redhat.com/errata/RHSA-2025:7165 | 2025-05-22 | |
| https://access.redhat.com/errata/RHSA-2025:7458 | 2025-05-22 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Oracle Search vendor "Oracle" | Linux Search vendor "Oracle" for product "Linux" | * | - |
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| Red Hat Search vendor "Red Hat" | Enterprise Linux Search vendor "Red Hat" for product "Enterprise Linux" | * | - |
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| Redhat Search vendor "Redhat" | Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux" | * | - |
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| Redhat Search vendor "Redhat" | Rhel Aus Search vendor "Redhat" for product "Rhel Aus" | * | - |
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| Redhat Search vendor "Redhat" | Rhel E4s Search vendor "Redhat" for product "Rhel E4s" | * | - |
Affected
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| Redhat Search vendor "Redhat" | Rhel Eus Search vendor "Redhat" for product "Rhel Eus" | * | - |
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| Redhat Search vendor "Redhat" | Rhel Tus Search vendor "Redhat" for product "Rhel Tus" | * | - |
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| Tigervnc Search vendor "Tigervnc" | Tigervnc Search vendor "Tigervnc" for product "Tigervnc" | * | - |
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| X.org Search vendor "X.org" | X Server Search vendor "X.org" for product "X Server" | * | - |
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| X.org Search vendor "X.org" | Xwayland Search vendor "X.org" for product "Xwayland" | * | - |
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| Amazon Search vendor "Amazon" | Linux Search vendor "Amazon" for product "Linux" | * | - |
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| Canonical Search vendor "Canonical" | Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux" | * | - |
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| Debian Search vendor "Debian" | Debian Linux Search vendor "Debian" for product "Debian Linux" | * | - |
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| Fedoraproject Search vendor "Fedoraproject" | Fedora Search vendor "Fedoraproject" for product "Fedora" | * | - |
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| Freebsd Search vendor "Freebsd" | Freebsd Search vendor "Freebsd" for product "Freebsd" | * | - |
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| Opensuse Search vendor "Opensuse" | Leap Search vendor "Opensuse" for product "Leap" | * | - |
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| Oracle Search vendor "Oracle" | Linux Search vendor "Oracle" for product "Linux" | * | - |
Affected
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| Redhat Search vendor "Redhat" | Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux" | * | - |
Affected
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| Redhat Search vendor "Redhat" | Rhel Aus Search vendor "Redhat" for product "Rhel Aus" | * | - |
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| Redhat Search vendor "Redhat" | Rhel E4s Search vendor "Redhat" for product "Rhel E4s" | * | - |
Affected
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| Redhat Search vendor "Redhat" | Rhel Els Search vendor "Redhat" for product "Rhel Els" | * | - |
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| Redhat Search vendor "Redhat" | Rhel Eus Search vendor "Redhat" for product "Rhel Eus" | * | - |
Affected
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| Redhat Search vendor "Redhat" | Rhel Tus Search vendor "Redhat" for product "Rhel Tus" | * | - |
Affected
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| Rocky Search vendor "Rocky" | Linux Search vendor "Rocky" for product "Linux" | * | - |
Affected
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| Slackware Search vendor "Slackware" | Slackware Linux Search vendor "Slackware" for product "Slackware Linux" | * | - |
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| Suse Search vendor "Suse" | Sle-module-basesystem Search vendor "Suse" for product "Sle-module-basesystem" | * | - |
Affected
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| Suse Search vendor "Suse" | Sle-module-development-tools Search vendor "Suse" for product "Sle-module-development-tools" | * | - |
Affected
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| Suse Search vendor "Suse" | Sle-we Search vendor "Suse" for product "Sle-we" | * | - |
Affected
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| Suse Search vendor "Suse" | Sle Hpc-espos Search vendor "Suse" for product "Sle Hpc-espos" | * | - |
Affected
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| Suse Search vendor "Suse" | Sle Hpc-ltss Search vendor "Suse" for product "Sle Hpc-ltss" | * | - |
Affected
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| Suse Search vendor "Suse" | Sles-ltss-extended-security Search vendor "Suse" for product "Sles-ltss-extended-security" | * | - |
Affected
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| Suse Search vendor "Suse" | Sles-ltss Search vendor "Suse" for product "Sles-ltss" | * | - |
Affected
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| Suse Search vendor "Suse" | Sles Sap Search vendor "Suse" for product "Sles Sap" | * | - |
Affected
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| Suse Search vendor "Suse" | Suse-manager-proxy Search vendor "Suse" for product "Suse-manager-proxy" | * | - |
Affected
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| Suse Search vendor "Suse" | Suse-manager-server Search vendor "Suse" for product "Suse-manager-server" | * | - |
Affected
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