Vulnerability Description
The do_umount function in fs/namespace.c in the Linux kernel through 3.17 does not require the CAP_SYS_ADMIN capability for do_remount_sb calls that change the root filesystem to read-only, which allows local users to cause a denial of service (loss of writability) by making certain unshare system calls, clearing the / MNT_LOCKED flag, and making an MNT_FORCE umount system call.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | <= 3.17 |
| Canonical | Ubuntu Linux | 10.04 |
References
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0ef3a5Mailing ListPatchVendor Advisory
- http://secunia.com/advisories/60174Broken Link
- http://secunia.com/advisories/61145Broken Link
- http://secunia.com/advisories/62633Broken Link
- http://secunia.com/advisories/62634Broken Link
- http://thread.gmane.org/gmane.linux.kernel.stable/109312Broken Link
- http://www.openwall.com/lists/oss-security/2014/10/08/22Mailing ListThird Party Advisory
- http://www.securityfocus.com/bid/70314Third Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1031180Third Party AdvisoryVDB Entry
- http://www.ubuntu.com/usn/USN-2415-1Third Party Advisory
- http://www.ubuntu.com/usn/USN-2416-1Third Party Advisory
- http://www.ubuntu.com/usn/USN-2417-1Third Party Advisory
- http://www.ubuntu.com/usn/USN-2418-1Third Party Advisory
- http://www.ubuntu.com/usn/USN-2419-1Third Party Advisory
- http://www.ubuntu.com/usn/USN-2420-1Third Party Advisory
FAQ
What is CVE-2014-7975?
CVE-2014-7975 is a vulnerability with a CVSS score of 5.5 (MEDIUM). The do_umount function in fs/namespace.c in the Linux kernel through 3.17 does not require the CAP_SYS_ADMIN capability for do_remount_sb calls that change the root filesystem to read-only, which allo...
How severe is CVE-2014-7975?
CVE-2014-7975 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2014-7975?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Canonical Ubuntu Linux.