CVE-2017-8246 Information

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.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

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

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8