The _xfs_buf_find function in fs/xfs/xfs_buf.c in the Linux kernel before 3.7.6 does not validate block numbers, which allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact by leveraging the ability to mount an XFS filesystem containing a metadata inode with an invalid extent map.

References

• https://nvd.nist.gov/vuln/detail/CVE-2013-1819
• torvalds/linux@eb17861
• https://bugzilla.redhat.com/show_bug.cgi?id=918009
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=eb178619f930fa2ba2348de332a1ff1c66a31424
• http://lists.opensuse.org/opensuse-security-announce/2013-09/msg00003.html
• http://lists.opensuse.org/opensuse-security-announce/2013-09/msg00004.html
• http://lists.opensuse.org/opensuse-updates/2013-12/msg00129.html
• http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.7.6
• http://www.openwall.com/lists/oss-security/2013/03/05/10
• http://www.ubuntu.com/usn/USN-1968-1
• http://www.ubuntu.com/usn/USN-1969-1
• http://www.ubuntu.com/usn/USN-1970-1
• http://www.ubuntu.com/usn/USN-1972-1
• http://www.ubuntu.com/usn/USN-1973-1
• http://www.ubuntu.com/usn/USN-1975-1
• https://access.redhat.com/errata/RHSA-2013:0829
• https://access.redhat.com/security/cve/CVE-2013-1819
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=eb178619f930fa2ba2348de332a1ff1c66a31424