CVE-2023-52491

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

media: mtk-jpeg: Fix use after free bug due to error path handling in mtk_jpeg_dec_device_run

In mtk_jpeg_probe, &jpeg->job_timeout_work is bound with

mtk_jpeg_job_timeout_work.

In mtk_jpeg_dec_device_run, if error happens in

mtk_jpeg_set_dec_dst, it will finally start the worker while

mark the job as finished by invoking v4l2_m2m_job_finish.

There are two methods to trigger the bug. If we remove the

module, it which will call mtk_jpeg_remove to make cleanup.

The possible sequence is as follows, which will cause a

use-after-free bug.

CPU0 CPU1

mtk_jpeg_dec_... |

start worker |

|mtk_jpeg_job_timeout_work

mtk_jpeg_remove |

v4l2_m2m_release |

kfree(m2m_dev); |

|

| v4l2_m2m_get_curr_priv

| m2m_dev->curr_ctx //use

If we close the file descriptor, which will call mtk_jpeg_release,

it will have a simila

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References