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Date: Thu, 12 Oct 2017 13:02:40 -0700
From: Kees Cook <>
Cc: Chris Salls <>
Subject: CVE-2017-5123 Linux kernel v4.13 waitid() not calling access_ok()


Chris Salls discovered that when the waitid() syscall in Linux kernel
v4.13 was refactored, it accidentally stopped checking that the
incoming argument was pointing to userspace. This allowed local
attackers to write directly to kernel memory, which could lead to
privilege escalation.

Introduced by this commit:

Fixed with this commit to mainline tree:

This should be fixed in the -stable free (in the future v4.13.7) soon:



Kees Cook
Pixel Security

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