CVE-2017-9605

Published: 13 June 2017

The vmw_gb_surface_define_ioctl function (accessible via DRM_IOCTL_VMW_GB_SURFACE_CREATE) in drivers/gpu/drm/vmwgfx/vmwgfx_surface.c in the Linux kernel through 4.11.4 defines a backup_handle variable but does not give it an initial value. If one attempts to create a GB surface, with a previously allocated DMA buffer to be used as a backup buffer, the backup_handle variable does not get written to and is then later returned to user space, allowing local users to obtain sensitive information from uninitialized kernel memory via a crafted ioctl call.

From the Ubuntu Security Team

Murray McAllister discovered that the DRM driver for VMware Virtual GPUs in the Linux kernel did not properly initialize memory. A local attacker could use this to expose sensitive information (kernel memory).

Status

Severity score breakdown

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-9605
• http://www.openwall.com/lists/oss-security/2017/06/13/2
• https://ubuntu.com/security/notices/USN-3358-1
• https://ubuntu.com/security/notices/USN-3359-1
• https://ubuntu.com/security/notices/USN-3360-1
• https://ubuntu.com/security/notices/USN-3360-2
• https://ubuntu.com/security/notices/USN-3364-1
• https://ubuntu.com/security/notices/USN-3364-2
• https://ubuntu.com/security/notices/USN-3364-3
• https://ubuntu.com/security/notices/USN-3371-1
• NVD
• Launchpad
• Debian