High severity · published Feb 25, 2025
CVE-2025-26595
A buffer overflow flaw was found in X.Org and Xwayland
7.8
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 38% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EL
Enterprise Linux · Redhat
7.0; 8.0; 9.0 · source: NVD
TI
Tigervnc · Tigervnc
All versions, or not specified · source: NVD
XS
X Server · X.org
before 21.1.16 · source: NVD
XW
Xwayland · X.org
before 24.1.6 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-26595
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-26595
Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2500
Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2502
Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2861
Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2862
Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2865
Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2866
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