Ubuntu Security Notice 618-1 - Memory access issues, buffer overflows, denial of service, race conditions.. all sorts of fun and mayhem has been addressed in the Linux 2.6 kernel branch on Ubuntu.
0acf6967795b6e572efa6fa96bc8daa4c48aa9762c583cd6ee70d852449a6d06
Debian Security Advisory 1428-2 - Several local and remote vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service or the execution of arbitrary code.
d208aaafcdf71649d5f5d53804b2a9df4f4a595a2e6095dd3483d2570b3018ed