CVE-2026-68233

Service interruption via rearmed BO cache timer

Published Aug 10, 2026 · Updated Aug 10, 2026

Incorrect synchronization in the Linux vc4 driver allows local users to cause system instability during BO-cache teardown. In vc4_bo_cache_destroy(), timer deletion precedes work cancellation, allowing time_work to rearm the timer and queue work after teardown. Exploitation requires local access to a system using the vc4 graphics driver and can destabilize the system or interrupt service.

CVSS severity5.3
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

Incorrect synchronization in the Linux vc4 driver allows local users to cause system instability during BO-cache teardown. In vc4_bo_cache_destroy(), timer deletion precedes work cancellation, allowing time_work to rearm the timer and queue work after teardown. Exploitation requires local access to a system using the vc4 graphics driver and can destabilize the system or interrupt service.

The record

CVE
CVE-2026-68233
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-821, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=4.5
  2. Affected versionversion=c826a6e1064419f78855463cf29ce9e8b9d25bf4 <6273dd3ffb54ec581855b82ae77331b66028249c
  3. Affected versionversion=c826a6e1064419f78855463cf29ce9e8b9d25bf4 <a38f2724eb93a78ba250b01e0caf3468df4d3956
  4. Affected versionversion=c826a6e1064419f78855463cf29ce9e8b9d25bf4 <bac4c1a9af690b8635c6924872075c41d8763ed9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.5; version=c826a6e1064419f78855463cf29ce9e8b9d25bf4 <6273dd3ffb54ec581855b82ae77331b66028249c; version=c826a6e1064419f78855463cf29ce9e8b9d25bf4 <a38f2724eb93a78ba250b01e0caf3468df4d3956; version=c826a6e1064419f78855463cf29ce9e8b9d25bf4 <bac4c1a9af690b8635c6924872075c41d8763ed9

Published CVSS scores

5.3Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/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 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

CWE-821Incorrect Synchronization
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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