CVE-2026-98848

Probe-time trap via late clock-array count initialization

Published Oct 18, 2026 · Updated Oct 18, 2026

Linux's AC100 RTC driver triggers a probe-time trap through incorrect clock-array initialization; attacker control is not established. The ac100_rtc_register_clks() function stores clock pointers in hws[] before setting num, leaving the sanitizer-visible array length at zero despite sufficient allocation. Probing requires CONFIG_UBSAN_BOUNDS and GCC 15.1+ or Clang 20.1+ for bounds reports; CONFIG_UBSAN_TRAP turns the first store into a trap, without an established data-disclosure or code-execution consequence.

CVSS severityUnavailable
Unscored
EPSS probability0.16%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Linux's AC100 RTC driver triggers a probe-time trap through incorrect clock-array initialization; attacker control is not established. The ac100_rtc_register_clks() function stores clock pointers in hws[] before setting num, leaving the sanitizer-visible array length at zero despite sufficient allocation. Probing requires CONFIG_UBSAN_BOUNDS and GCC 15.1+ or Clang 20.1+ for bounds reports; CONFIG_UBSAN_TRAP turns the first store into a trap, without an established data-disclosure or code-execution consequence.

The record

CVE
CVE-2026-98848
Published
Oct 18, 2026
Updated
Oct 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.6
  2. Affected versionversion=f316cdff8d677db9ad9c90acb44c4cd535b0ee27 <160619b38707241e22569f9c983a4b3d0890996a
  3. Affected versionversion=f316cdff8d677db9ad9c90acb44c4cd535b0ee27 <6a4117eee82dd85f11bf898bf66026764011eeb6
  4. Affected versionversion=f316cdff8d677db9ad9c90acb44c4cd535b0ee27 <6bb55381daf1a1bed0657189a1396e7467712525
  5. Affected versionversion=f316cdff8d677db9ad9c90acb44c4cd535b0ee27 <ad1bf77039cba83373bf1eff3784655e3e3ed2ab

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.6; version=f316cdff8d677db9ad9c90acb44c4cd535b0ee27 <160619b38707241e22569f9c983a4b3d0890996a; version=f316cdff8d677db9ad9c90acb44c4cd535b0ee27 <6a4117eee82dd85f11bf898bf66026764011eeb6; version=f316cdff8d677db9ad9c90acb44c4cd535b0ee27 <6bb55381daf1a1bed0657189a1396e7467712525; version=f316cdff8d677db9ad9c90acb44c4cd535b0ee27 <ad1bf77039cba83373bf1eff3784655e3e3ed2ab

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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