Bug 395711

Summary:	kernel: tight loop and no preemption can cause system stall (CVE-2011-4621)
Product:	Gentoo Security	Reporter:	Michael Harrison <n0idx80>
Component:	Kernel	Assignee:	Gentoo Kernel Security <security-kernel>
Status:	RESOLVED FIXED
Severity:	normal	CC:	kernel
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
URL:	https://bugzilla.redhat.com/show_bug.cgi?id=769711
Whiteboard:
Package list:		Runtime testing required:	---

Description Michael Harrison 2011-12-22 19:16:12 UTC

A tight loop in user level process isn't preempted unless a realtime process is
woken up on the cpu.  Some important kernel threads such as events/*, kblockd/*
can be blocked by the process, and the machine stalls.

Unprivileged local user could use this flaw to DoS the system.

Upstream commit:
f26f9aff6aaf67e9a430d16c266f91b13a5bff64

Reference:
https://lkml.org/lkml/2010/11/20/212

Comment 1 Aaron Bauman (RETIRED) gentoo-dev

2018-04-04 17:47:02 UTC

There are no longer any 2.x kernels available in the repository with the exception of sys-kernel/xbox-sources which is unsupported by security.