CVE-2017-8246

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2017-05-12 · updated 2026-06-17
Weakness: CWE-416

Description

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

Android: all versions

References

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

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