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CVE-2015-7884: Kernel Infoleak vulnerability in vivid_fb_ioctl()

by speiro - Oct 22, 2015 - CVE-2015-7884, security, kernel, infoleak,

Summary

CVE CVE-2015-7884
Author Salva Peiró
Date October 2015 - Discovery of the vulnerability.
Impact The vulnerability discloses 16 bytes of kernel process stack.
Affected Versions From linux-3.17.0-rc1 to linux-4.3-rc6
Bug Timespan 1 year: from 2014 to 2015 commit ad4e02d5081d9da38b5b91886e5fa71f0505d607
Patch fix commit eda98796aff0d9bf41094b06811f5def3b4c333c

Description

The vivid_fb_ioctl() code fails to initialize the 16 reserved bytes of struct fb_vblank after the ->hcount member. Add an explicit memset(0) before filling the structure to avoid the info leak.

The patch fixing the Infoleak

After verification the patch that fixes the vulnerability has been …

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