CVE-2026-68090

Timer disruption via debugobjects OOM race

Published Aug 10, 2026 · Updated Aug 10, 2026

Race condition in the Linux kernel allows local users to disrupt timer operation during a concurrent debugobjects OOM shutdown. The debug_object_assert_init() and debug_object_activate() paths invoke their fixup callbacks after another task disables debug objects and frees shadow objects, so an error-pointer lookup is handled as an object fault. Exploitation requires debug objects to be enabled, memory exhaustion to race the lookup, and local execution; the demonstrated consequence is a dysfunctional timer and denial of service.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux kernel allows local users to disrupt timer operation during a concurrent debugobjects OOM shutdown. The debug_object_assert_init() and debug_object_activate() paths invoke their fixup callbacks after another task disables debug objects and frees shadow objects, so an error-pointer lookup is handled as an object fault. Exploitation requires debug objects to be enabled, memory exhaustion to race the lookup, and local execution; the demonstrated consequence is a dysfunctional timer and denial of service.

The record

CVE
CVE-2026-68090
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
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=3.3
  2. Affected versionversion=b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 <1f4f02b336c3be125c8fcf87df73db2e0e028b8b
  3. Affected versionversion=b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 <203a965bf2ab43130778d8214fb0c3c8c2d19cdf
  4. Affected versionversion=b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 <23da32e88627e63e0864f59f4c63a2dc0ab851a3
  5. Affected versionversion=b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 <2d5e320b7ab9b25229ac4331541964a58b5e1d29
  6. Affected versionversion=b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 <b81dde13cc163450dcb402dcc915ef13ba241e01
  7. Affected versionversion=b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 <c00164c9e7fa6145886ad666806cb5347895de5c
  8. Affected versionversion=b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 <d663fbf28b2eebe665bb9cf828d7d528e5a8707e
  9. Affected versionversion=b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 <e2e255d07723c330dded8e576ce28a8d23a692ce

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.3; version=b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 <1f4f02b336c3be125c8fcf87df73db2e0e028b8b; version=b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 <203a965bf2ab43130778d8214fb0c3c8c2d19cdf; version=b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 <23da32e88627e63e0864f59f4c63a2dc0ab851a3; version=b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 <2d5e320b7ab9b25229ac4331541964a58b5e1d29; version=b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 <b81dde13cc163450dcb402dcc915ef13ba241e01; version=b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 <c00164c9e7fa6145886ad666806cb5347895de5c; version=b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 <d663fbf28b2eebe665bb9cf828d7d528e5a8707e; version=b84d435cc228e87951f3bbabf6cc4a5f25d5fb16 <e2e255d07723c330dded8e576ce28a8d23a692ce

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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