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Date: Tue, 15 Apr 2014 23:59:36 +0530 (IST)
From: P J P <>
To: oss security list <>
Subject: CVE request Linux kernel: arch: x86: net: bpf_jit: an off-by-one
 bug in x86_64 cond jump target


An off-by-one bug is found in the x86_64 cond jump target of the BPF JIT 
filter code. In case a conditional jump is followed by a long jump, 
conditional jump target is one byte past the start of target instruction.

A user/program could use this flaw to crash the kernel resulting in DoS, or 
potentially escalate user privileges on a system to gain root access.

Upstream fix:

Introduced by:

Note: BPF JIT is disabled by default, must be enabled by the admin.

Thank you.
Prasad J Pandit / Red Hat Security Response Team

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