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Date: Mon, 27 Aug 2018 05:25:15 -0400 (EDT)
From: Vladis Dronov <vdronov@...hat.com>
To: oss-security@...ts.openwall.com
Subject: CVE-2018-10938: Linux kernel: net: infinite loop in
 net/ipv4/cipso_ipv4.c:cipso_v4_optptr() allows a remote DoS

Heololo,

A flaw was found in the Linux kernel present since v4.0-rc1 and through v4.13-rc4.
A crafted network packet sent remotely by an attacker may force the kernel to enter
an infinite loop in the cipso_v4_optptr() function in net/ipv4/cipso_ipv4.c leading
to a denial-of-service.

All the kernels with the cipso_v4_optptr() function which have not backported
the upstream commit 40413955ee26 are vulnerable.

Thanks to Yves Younan from Cisco for mentioning this.

References:

https://bugzilla.redhat.com/show_bug.cgi?id=1622404

Upstream Patch introduced the flaw:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=04f81f0154e4bf002be6f4d85668ce1257efa4d9

Upstream Patch fixed the flaw:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=40413955ee265a5e42f710940ec78f5450d49149

Best regards,
Vladis Dronov | Red Hat, Inc. | Product Security Engineer

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