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CVE Vulnerabilities

CVE-2025-62231

Integer Overflow or Wraparound

Published: Oct 30, 2025 | Modified: Nov 11, 2025
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
RedHat/V2
RedHat/V3
7.3 MODERATE
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
Ubuntu
MEDIUM
Vulnerability-free packages from our partners
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2025-62231
CWEhttps://cwe.mitre.org/data/definitions/190.html

A flaw was identified in the X.Org X server’s X Keyboard (Xkb) extension where improper bounds checking in the XkbSetCompatMap() function can cause an unsigned short overflow. If an attacker sends specially crafted input data, the value calculation may overflow, leading to memory corruption or a crash.

Weakness

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.

Affected Software

Name Vendor Start Version End Version
Red Hat Enterprise Linux 10 RedHat xorg-x11-server-Xwayland-0:24.1.5-5.el10_0 *
Red Hat Enterprise Linux 10 RedHat xorg-x11-server-Xwayland-0:24.1.5-5.el10_1 *
Red Hat Enterprise Linux 8 RedHat xorg-x11-server-Xwayland-0:21.1.3-19.el8_10 *
Red Hat Enterprise Linux 8 RedHat xorg-x11-server-0:1.20.11-27.el8_10 *
Red Hat Enterprise Linux 8 RedHat tigervnc-0:1.15.0-8.el8_10 *
Red Hat Enterprise Linux 9 RedHat xorg-x11-server-0:1.20.11-32.el9_6 *
Red Hat Enterprise Linux 9 RedHat tigervnc-0:1.14.1-9.el9_6 *
Red Hat Enterprise Linux 9 RedHat xorg-x11-server-Xwayland-0:23.2.7-5.el9_6 *
Red Hat Enterprise Linux 9 RedHat tigervnc-0:1.15.0-6.el9_7 *
Red Hat Enterprise Linux 9 RedHat xorg-x11-server-Xwayland-0:23.2.7-5.el9_7 *
Red Hat Enterprise Linux 9 RedHat xorg-x11-server-0:1.20.11-32.el9_7 *
Xorg-server Ubuntu jammy *
Xorg-server Ubuntu noble *
Xorg-server Ubuntu plucky *
Xorg-server Ubuntu questing *
Xorg-server Ubuntu upstream *
Xwayland Ubuntu jammy *
Xwayland Ubuntu noble *
Xwayland Ubuntu plucky *
Xwayland Ubuntu questing *
Xwayland Ubuntu upstream *

Potential Mitigations

  • Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
  • If possible, choose a language or compiler that performs automatic bounds checking.
  • Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid [REF-1482].
  • Use libraries or frameworks that make it easier to handle numbers without unexpected consequences.
  • Examples include safe integer handling packages such as SafeInt (C++) or IntegerLib (C or C++). [REF-106]
  • Perform input validation on any numeric input by ensuring that it is within the expected range. Enforce that the input meets both the minimum and maximum requirements for the expected range.
  • Use unsigned integers where possible. This makes it easier to perform validation for integer overflows. When signed integers are required, ensure that the range check includes minimum values as well as maximum values.
  • Understand the programming language’s underlying representation and how it interacts with numeric calculation (CWE-681). Pay close attention to byte size discrepancies, precision, signed/unsigned distinctions, truncation, conversion and casting between types, “not-a-number” calculations, and how the language handles numbers that are too large or too small for its underlying representation. [REF-7]
  • Also be careful to account for 32-bit, 64-bit, and other potential differences that may affect the numeric representation.

References

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