Date: Thu, 12 Oct 2017 13:02:40 -0700 From: Kees Cook <keescook@...omium.org> To: oss-security@...ts.openwall.com Cc: Chris Salls <chrissalls5@...il.com> Subject: CVE-2017-5123 Linux kernel v4.13 waitid() not calling access_ok() Hi, 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: https://git.kernel.org/linus/4c48abe91be03d191d0c20cc755877da2cb35622 Fixed with this commit to mainline tree: https://git.kernel.org/linus/96ca579a1ecc943b75beba58bebb0356f6cc4b51 This should be fixed in the -stable free (in the future v4.13.7) soon: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/log/?h=linux-4.13.y Thanks, -Kees -- Kees Cook Pixel Security
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