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Date: Thu, 23 Feb 2017 19:36:58 +0100
From: Salvatore Bonaccorso <>
To: OSS Security Mailinglist <>
Cc: Dmitry Vyukov <>, Eric Dumazet <>,
	Willy Tarreau <>, "David S. Miller" <>
Subject: Linux: CVE-2017-6214: ipv4/tcp: infinite loop in tcp_splice_read()


CVE-2017-6214 has been assigned for the following commit in Linux by
MITRE (via the webform):

as included in v4.10-rc8:

>     tcp: avoid infinite loop in tcp_splice_read()
>     Splicing from TCP socket is vulnerable when a packet with URG flag is
>     received and stored into receive queue.
>     __tcp_splice_read() returns 0, and sk_wait_data() immediately
>     returns since there is the problematic skb in queue.
>     This is a nice way to burn cpu (aka infinite loop) and trigger
>     soft lockups.
>     Again, this gem was found by syzkaller tool.
>     Fixes: 9c55e01c0cc8 ("[TCP]: Splice receive support.")
>     Signed-off-by: Eric Dumazet <>
>     Reported-by: Dmitry Vyukov  <>
>     Cc: Willy Tarreau <>
>     Signed-off-by: David S. Miller <>

The fix was backported to 4.9.11


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