CVE-2026-64358

Kernel warning via unconditional workqueue cancellation

Published Jul 25, 2026 · Updated Jul 25, 2026

Improper workqueue handling in the Linux kernel mtk-jpeg driver allows local users to trigger a kernel warning when closing a JPEG device. mtk_jpeg_release calls cancel_work_sync even when the platform's jpeg_worker callback is null, causing WARN_ON in __flush_work. The path requires local access to a non-multicore MediaTek JPEG device, and the reported consequence is a warning rather than memory corruption.

CVSS severity3.3
Low
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper workqueue handling in the Linux kernel mtk-jpeg driver allows local users to trigger a kernel warning when closing a JPEG device. mtk_jpeg_release calls cancel_work_sync even when the platform's jpeg_worker callback is null, causing WARN_ON in __flush_work. The path requires local access to a non-multicore MediaTek JPEG device, and the reported consequence is a warning rather than memory corruption.

The record

CVE
CVE-2026-64358
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 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=0498b27a1542021d90269d58347501d4c3ccd84e <ac0774961a6ea174a71d4ffa39966edafbf7662d
  2. Affected versionversion=2209fdae5c2f615930c9af1379c1cfca199ec5d8 <0fed0fc34ce734b4b8c2f6a467d38bddcb21dda9
  3. Affected versionversion=26506a30e0e26d612f82a7bf0e395626968a44e6 <973408ceab14555a8548b97c8cc7b54208c3f251
  4. Affected versionversion=34c519feef3e4fcff1078dc8bdb25fbbbd10303f <4c4b4af4a9f278da096f0dbdb6b59594701d29bf
  5. Affected versionversion=34c519feef3e4fcff1078dc8bdb25fbbbd10303f <b1845a227fda37b2fe5327df3ca0015d7e290235
  6. Affected versionversion=6.12.86 <6.12.96
  7. Affected versionversion=6.18.27 <6.18.39
  8. Affected versionversion=6.6.140 <6.6.145
  9. Affected versionversion=7.0.4 <7.1
  10. Affected versionversion=7.1
  11. Affected versionversion=e78c39f720679fcf3a2eacd82725ec3ea2648301

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0498b27a1542021d90269d58347501d4c3ccd84e <ac0774961a6ea174a71d4ffa39966edafbf7662d; version=2209fdae5c2f615930c9af1379c1cfca199ec5d8 <0fed0fc34ce734b4b8c2f6a467d38bddcb21dda9; version=26506a30e0e26d612f82a7bf0e395626968a44e6 <973408ceab14555a8548b97c8cc7b54208c3f251; version=34c519feef3e4fcff1078dc8bdb25fbbbd10303f <4c4b4af4a9f278da096f0dbdb6b59594701d29bf; version=34c519feef3e4fcff1078dc8bdb25fbbbd10303f <b1845a227fda37b2fe5327df3ca0015d7e290235; version=6.12.86 <6.12.96; version=6.18.27 <6.18.39; version=6.6.140 <6.6.145; version=7.0.4 <7.1; version=7.1; version=e78c39f720679fcf3a2eacd82725ec3ea2648301

Published CVSS scores

3.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

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

T1499.004Endpoint Denial of Service: Application 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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