SB2015111603 - Race condition in Linux kernel

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2015-7312)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a local user to read and manipulate data.

Multiple race conditions in the Advanced Union Filesystem (aufs) aufs3-mmap.patch and aufs4-mmap.patch patches for the Linux kernel 3.x and 4.x allow local users to cause a denial of service (use-after-free and BUG) or possibly gain privileges via a (1) madvise or (2) msync system call, related to mm/madvise.c and mm/msync.c.

Remediation

Install update from vendor's website.

References

• http://sourceforge.net/p/aufs/mailman/message/34449209/
• http://www.debian.org/security/2015/dsa-3364
• http://www.openwall.com/lists/oss-security/2015/09/22/10
• http://www.ubuntu.com/usn/USN-2777-1