Published: 23 February 2012
The I/O implementation for block devices in the Linux kernel before 2.6.33 does not properly handle the CLONE_IO feature, which allows local users to cause a denial of service (I/O instability) by starting multiple processes that share an I/O context.
From the Ubuntu security team
Louis Rilling discovered a flaw in Linux kernel's clone command when CLONE_IO is specified. An unprivileged local user could exploit this to cause a denial of service.
CVSS 3 base score: 5.5
per Petr Matousek, "Looks like it got fixed in Linux kernel 2.6.33(-rc1)"
CLONE_IO was introduced by the commit below, the bug cannot have existed before then: fadad878cc0640cc9cd5569998bf54b693f7b38b