CVE-2014-7975

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.

References

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0ef3a56b1c466629cd0bf482b09c7b0e5a085bb5

http://secunia.com/advisories/60174

http://secunia.com/advisories/61145

http://secunia.com/advisories/62633

http://secunia.com/advisories/62634

http://thread.gmane.org/gmane.linux.kernel.stable/109312

http://www.openwall.com/lists/oss-security/2014/10/08/22

http://www.securityfocus.com/bid/70314

http://www.securitytracker.com/id/1031180

http://www.ubuntu.com/usn/USN-2415-1

http://www.ubuntu.com/usn/USN-2416-1

http://www.ubuntu.com/usn/USN-2417-1

http://www.ubuntu.com/usn/USN-2418-1

http://www.ubuntu.com/usn/USN-2419-1

http://www.ubuntu.com/usn/USN-2420-1

http://www.ubuntu.com/usn/USN-2421-1

https://access.redhat.com/errata/RHSA-2017:1842

https://access.redhat.com/errata/RHSA-2017:2077

https://bugzilla.redhat.com/show_bug.cgi?id=1151108

https://exchange.xforce.ibmcloud.com/vulnerabilities/96994

Details

Risk Information

CVSS v2

CVSS v3