SB2026102041 - Multiple vulnerabilities in X.Org server

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Main Vulnerability Database SB2026102041

SB2026102041 - Multiple vulnerabilities in X.Org server

Published: October 20, 2026

Security Bulletin ID SB2026102041
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 10
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 10 vulnerabilities.


1) Use-after-free (CVE-ID: CVE-2026-93515)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a local user to compromise vulnerable system.

The vulnerability exists due to a use-after-free error within the handling of present_window_priv objects. A local user can gain access to sensitive information on the system.


2) Out-of-bounds read (CVE-ID: CVE-2026-93524)

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

CVSSv4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N]


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

The vulnerability exists due to a boundary condition within the handling of XkbSetMap requests. A local user can trigger an out-of-bounds read error and read contents of memory on the system.


3) Heap-based buffer overflow (CVE-ID: CVE-2026-93523)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 8.5 [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]


The vulnerability allows a local user to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the handling of modifier fields. A local user can pass specially crafted data to the application, trigger a heap-based buffer overflow and execute arbitrary code with elevated privileges.


4) Heap-based buffer overflow (CVE-ID: CVE-2026-93522)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 8.5 [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]


The vulnerability allows a local user to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the glamor_upload_boxes function. A local user can pass specially crafted data to the application, trigger a heap-based buffer overflow and execute arbitrary code with elevated privileges.


5) Heap-based buffer overflow (CVE-ID: CVE-2026-93521)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 8.5 [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]


The vulnerability allows a local user to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the RRChangeProviderProperty function. A local user can pass specially crafted data to the application, trigger a heap-based buffer overflow and execute arbitrary code with elevated privileges.


6) Heap-based buffer overflow (CVE-ID: CVE-2026-93520)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 8.5 [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]


The vulnerability allows a local user to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the XkbChangeKeycodeRange function. A local user can pass specially crafted data to the application, trigger a heap-based buffer overflow and execute arbitrary code with elevated privileges.


7) Heap-based buffer overflow (CVE-ID: CVE-2026-93519)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 8.5 [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]


The vulnerability allows a local user to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the input_constrain_cursor function. A local user can pass specially crafted data to the application, trigger a heap-based buffer overflow and execute arbitrary code with elevated privileges.


8) Numeric Truncation Error (CVE-ID: CVE-2026-93518)

CWE-ID: CWE-197 - Numeric Truncation Error

CVSSv4: 8.5 [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]


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

The vulnerability exists due to numeric truncation error within the handling of XkbSetMap requests, which leads to security restrictions bypass and privilege escalation.


9) Heap-based buffer overflow (CVE-ID: CVE-2026-93517)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 8.5 [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]


The vulnerability allows a local user to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the glXDisp_RenderLarge function. A local user can pass specially crafted data to the application, trigger a heap-based buffer overflow and execute arbitrary code with elevated privileges.


10) Use-after-free (CVE-ID: CVE-2026-93516)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a local user to compromise vulnerable system.

The vulnerability exists due to a use-after-free error within the handling of DeviceInt objects. A local user can gain access to sensitive information on the system.


Remediation

Install update from vendor's website.

References