Race condition in the handle_to_path function in fs/fhandle.c in the Linux kernel through 3.19.1 allows local users to bypass intended size restrictions and trigger read operations on additional memory locations by changing the handle_bytes value of a file handle during the execution of this function.

References

• https://nvd.nist.gov/vuln/detail/CVE-2015-1420
• https://bugzilla.redhat.com/show_bug.cgi?id=1187534
• http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00023.html
• http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00011.html
• http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00004.html
• http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00018.html
• http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00021.html
• http://marc.info/?l=linux-kernel&m=142247707318982&w=2
• http://www.debian.org/security/2015/dsa-3170
• http://www.openwall.com/lists/oss-security/2015/01/29/12
• http://www.securityfocus.com/bid/72357
• http://www.ubuntu.com/usn/USN-2660-1
• http://www.ubuntu.com/usn/USN-2661-1
• http://www.ubuntu.com/usn/USN-2665-1
• http://www.ubuntu.com/usn/USN-2667-1