Off-by-one error in the iov_iter_advance function in mm/filemap.c in the Linux kernel before 2.6.27-rc2 allows local users to cause a denial of service (system crash) via a certain sequence of file I/O operations with readv and writev, as demonstrated by testcases/kernel/fs/ftest/ftest03 from the Linux Test Project.
http://secunia.com/advisories/31881
http://secunia.com/advisories/32190
http://secunia.com/advisories/32393
http://www.debian.org/security/2008/dsa-1636
http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.27-rc2
http://www.lkml.org/lkml/2008/7/30/446
http://www.redhat.com/support/errata/RHSA-2008-0857.html
http://www.securityfocus.com/bid/31132