The sys_timer_create function in posix-timers.c for Linux kernel 2.6.x allows local users to cause a denial of service (memory consumption) and possibly bypass memory limits or cause other processes to be killed by creating a large number of posix timers, which are allocated in kernel memory but are not treated as part of the process' memory.
CVSS Severity (version 2.0):
Impact Subscore: 6.9
Exploitability Subscore: 3.9
CVSS Version 2 Metrics:
Access Vector: Locally exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows disruption of service
Official Statement from Red Hat (03/14/2007)
This issue can only be exploited if pending signals (ulimit -i) is set to "unlimited". In case of Red Hat Enterprise Linux version 2.1, 3 and 4 this is not the case and therefore they are not vulnerable to this issue.
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20060404 Linux Kernel Local DoS vulnerability.