SB20261022467 - Improper initialization in Linux kernel rtc driver

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Main Vulnerability Database SB20261022467

SB20261022467 - Improper initialization in Linux kernel rtc driver

Published: October 22, 2026

Security Bulletin ID SB20261022467
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper initialization (CVE-ID: CVE-2026-98848)

CWE-ID: CWE-665 - Improper Initialization

CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local privileged user to potentially cause a denial of service on systems configured to trap bounds-sanitizer violations.

The vulnerability exists due to improper initialization of the array element count in ac100_rtc_register_clks() in the Linux kernel AC100 RTC driver when probing the device with CONFIG_UBSAN_BOUNDS, CONFIG_UBSAN_TRAP, and a compiler supporting __counted_by. A local privileged user can trigger the affected probe path, if permitted, to cause a bounds-sanitizer trap because clock pointers are stored in .hws[] before its associated .num count is initialized.


Remediation

Install update from vendor's website.

References