CVE-2014-5045

Published: 1 August 2014

The mountpoint_last function in fs/namei.c in the Linux kernel before 3.15.8 does not properly maintain a certain reference count during attempts to use the umount system call in conjunction with a symlink, which allows local users to cause a denial of service (memory consumption or use-after-free) or possibly have unspecified other impact via the umount program.

From the Ubuntu Security Team

Vasily Averin discover a reference count flaw during attempts to umount in conjunction with a symlink. A local user could exploit this flaw to cause a denial of service (memory consumption or use after free) or possibly have other unspecified impact.

Notes

android kernels (goldfish, grouper, maguro, mako and manta) are not
supported on the Ubuntu Touch 13.10 preview kernels
android kernels (flo, goldfish, grouper, maguro, mako and manta) are
not supported on the Ubuntu Touch 14.04 preview kernels

Status

References

• https://lkml.org/lkml/2014/7/21/98
• https://lkml.org/lkml/2014/7/21/245
• https://ubuntu.com/security/notices/USN-2336-1
• https://ubuntu.com/security/notices/USN-2337-1
• https://www.cve.org/CVERecord?id=CVE-2014-5045
• NVD
• Launchpad
• Debian

Bugs

• https://launchpad.net/bugs/1349799