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Vulnerability record · CVE-2026-64358 · published 25 July 2026

CVE-2026-64358: Linux kernel null pointer dereference vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: media: mtk-jpeg: cancel workqueue on release for supported platforms only Since a recent fix the mtk_jpeg_release function cancels any pending or running work present in the driver workqueue using cancel_work_sync function. Currently, only the multicore based variants use this workqueue and they have the jpeg_worker platform data field initialized with a workqueue callback function. For the others, this field value remain NULL by default. The cancel_work_sync function is unconditionally called in mtk_jpeg_release function, even for the variants that do not use the workqueue. This call generates a WARN_ON print in __flush_work because the workqueue callback function presence check fails in __flush_work function (used by cancel_work_sync). So, to avoid these warnings, call cancel_work_sync only if a workqueue callback is defined in platform data.

5.5 CVSS 3.1 Medium EPSS 0.12% · top 98.3% CWE-476 · NULL pointer dereference
5.5CVSS 3.1 base score
0.12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
4 Sep 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: media: mtk-jpeg: cancel workqueue on release for supported platforms only Since a recent fix the mtk_jpeg_release function cancels any pending or running work present in the driver workqueue using cancel_work_sync function. Currently, only the multicore based variants use this workqueue and they have the jpeg_worker platform data field initialized with a workqueue callback function. For the others, this field value remain NULL by default. The cancel_work_sync function is unconditionally called in mtk_jpeg_release function, even for the variants that do not use the workqueue. This call generates a WARN_ON print in __flush_work because the workqueue callback function presence check fails in __flush_work function (used by cancel_work_sync). So, to avoid these warnings, call cancel_work_sync only if a workqueue callback is defined in platform data.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0fed0fc34ce734b4b8c2f6a467d38bddcb21dda9 Patch
https://git.kernel.org/stable/c/4c4b4af4a9f278da096f0dbdb6b59594701d29bf Patch
https://git.kernel.org/stable/c/973408ceab14555a8548b97c8cc7b54208c3f251 Patch
https://git.kernel.org/stable/c/ac0774961a6ea174a71d4ffa39966edafbf7662d Patch
https://git.kernel.org/stable/c/b1845a227fda37b2fe5327df3ca0015d7e290235 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-64358), CISA KEV, FIRST EPSS (scores of 2026-10-02). This page is refreshed as NVD updates the record.