vulnerability bulletin CVE-2013-4483
Linux kernel: denial of service via ipc_rcu_putref
Synthesis of the vulnerability
A local attacker can progressively force the Linux kernel to use all its memory, in order to trigger a denial of service.Impacted products:
BID-63445, CVE-2013-4483, MDVSA-2013:265, VIGILANCE-VUL-13673.
Description of the vulnerability
The RCU (Read Copy Update) feature is used to synchronize events, with no interruption of reading operations.
The ipc_rcu_putref() function uses RCU. However, sometimes, the number of users of a memory area is not decremented. The counter thus never reaches zero, and the memory area is never freed.
A local attacker can therefore progressively force the Linux kernel to use all its memory, in order to trigger a denial of service.Complete Vigil@nce bulletin....
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