# CVE-2023-52491: linux: In the Linux kernel, the following vulnerability has been resolved:  media: mtk-jpeg: Fix use after free bug due to e...

CVE-2023-52491 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-52491, released March 11, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2023-52491
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0028
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 11, 2024

## 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 similar sequence.  Fix this bug by starting timeout worker only if started jpegdec worker successfully. Then v4l2_m2m_job_finish will only be called in either mtk_jpeg_job_timeout_work or mtk_jpeg_dec_device_run.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.76-1 | [DEBIAN-CVE-2023-52491](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52491.md) | Mar 11, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.6.15-1 | [DEBIAN-CVE-2023-52491](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52491.md) | Mar 11, 2024 |
| Linux | linux Debian 14 | 6.6.15-1 | [DEBIAN-CVE-2023-52491](https://patchblox.com/security/data/fix/linux/debian-cve-2023-52491.md) | Mar 11, 2024 |

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