CVE-2026-68092

Boot delay via zero-clamped jiffies delta

Published Aug 10, 2026 · Updated Aug 10, 2026

Availability flaw in the Linux kernel 6.12.5 through 6.12.96 and 6.13 allows local users to cause a long Xen HVM boot delay. timekeeping_init() reads the jiffies clocksource before registration, leaving max_delta_raw at zero and clamping elapsed time to zero. The condition occurs during early boot and was observed in Xen HVM guests; the record reports delayed availability, not a crash or data impact.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Availability flaw in the Linux kernel 6.12.5 through 6.12.96 and 6.13 allows local users to cause a long Xen HVM boot delay. timekeeping_init() reads the jiffies clocksource before registration, leaving max_delta_raw at zero and clamping elapsed time to zero. The condition occurs during early boot and was observed in Xen HVM guests; the record reports delayed availability, not a crash or data impact.

The record

CVE
CVE-2026-68092
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-908, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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=1a678f6829a8c931fae2b62e4c88dae743c839c9 <fe9bdea65ba231fcfb155031628bb1e8491b5fe0
  2. Affected versionversion=6.12.5 <6.12.97
  3. Affected versionversion=6.13
  4. Affected versionversion=76031d9536a076bf023bedbdb1b4317fc801dd67 <75b478096c6bbf57fe366f7f0a8cd5365043ffaa
  5. Affected versionversion=76031d9536a076bf023bedbdb1b4317fc801dd67 <cd25e9819620aa1325897912cfb4dd89303325fe
  6. Affected versionversion=76031d9536a076bf023bedbdb1b4317fc801dd67 <f24df84cbe05e4471c04ac4b921fc0340bbc7752

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1a678f6829a8c931fae2b62e4c88dae743c839c9 <fe9bdea65ba231fcfb155031628bb1e8491b5fe0; version=6.12.5 <6.12.97; version=6.13; version=76031d9536a076bf023bedbdb1b4317fc801dd67 <75b478096c6bbf57fe366f7f0a8cd5365043ffaa; version=76031d9536a076bf023bedbdb1b4317fc801dd67 <cd25e9819620aa1325897912cfb4dd89303325fe; version=76031d9536a076bf023bedbdb1b4317fc801dd67 <f24df84cbe05e4471c04ac4b921fc0340bbc7752

Published CVSS scores

5.5OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
2.5Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource
T1499Endpoint Denial of Service

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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