Integer Underflow Vulnerability in BPF_S_ANC_NLATTR and BPF_S_ANC_NLATTR_NEST Extensions in Linux Kernel

CVE-2014-3144 · MEDIUM Severity

AV:L/AC:L/AU:N/C:N/I:N/A:C

The (1) BPF_S_ANC_NLATTR and (2) BPF_S_ANC_NLATTR_NEST extension implementations in the sk_run_filter function in net/core/filter.c in the Linux kernel through 3.14.3 do not check whether a certain length value is sufficiently large, which allows local users to cause a denial of service (integer underflow and system crash) via crafted BPF instructions. NOTE: the affected code was moved to the __skb_get_nlattr and __skb_get_nlattr_nest functions before the vulnerability was announced.

Learn more about our Cis Benchmark Audit For Distribution Independent Linux.