CVE-2023-52491

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxb2f0d2724ba477d326e9d654d4db1c93e98f8b93 < 43872f44eee6c6781fea1348b38885d8e78face9affected
LinuxLinuxb2f0d2724ba477d326e9d654d4db1c93e98f8b93 < 1b1036c60a37a30caf6759a90fe5ecd06ec35590affected
LinuxLinuxb2f0d2724ba477d326e9d654d4db1c93e98f8b93 < 9fec4db7fff54d9b0306a332bab31eac47eeb5f6affected
LinuxLinuxb2f0d2724ba477d326e9d654d4db1c93e98f8b93 < 8254d54d00eb6cdb8367399c7f912eb8d354ecd7affected
LinuxLinuxb2f0d2724ba477d326e9d654d4db1c93e98f8b93 < 6e2f37022f0fc0893da4d85a0500c9d547fffd4caffected
LinuxLinuxb2f0d2724ba477d326e9d654d4db1c93e98f8b93 < 206c857dd17d4d026de85866f1b5f0969f2a109eaffected
LinuxLinux4.12affected
LinuxLinux0 < 4.12unaffected
LinuxLinux5.10.210 <= 5.10.*unaffected
LinuxLinux5.15.149 <= 5.15.*unaffected
LinuxLinux6.1.76 <= 6.1.*unaffected
LinuxLinux6.6.15 <= 6.6.*unaffected
LinuxLinux6.7.3 <= 6.7.*unaffected
LinuxLinux6.8 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References