CVE-2017-8246

Impact

In function msm_pcm_playback_close() in all Android releases from CAF using the Linux kernel, prtd is assigned substream->runtime->private_data. Later, prtd is freed. However, prtd is not sanitized and set to NULL, resulting in a dangling pointer. There are other functions that access the same memory (substream->runtime->private_data) with a NULL check, such as msm_pcm_volume_ctl_put(), which means this freed memory could be used.

Affected products

Weakness classification

References

• NVD record
• CVE.org record
• https://source.android.com/security/bulletin/2017-07-01
• https://www.codeaurora.org/use-after-free-alsa-pcm-playback-kernel-module-cve-2017-8246
• https://source.android.com/security/bulletin/2017-07-01
• https://www.codeaurora.org/use-after-free-alsa-pcm-playback-kernel-module-cve-2017-8246