CVE-2017-7477 kernel: net: Heap overflow in skb_to_sgvec in macsec.c

[Andrej Nemec <anemec () redhat com>]

Hello folks,

Red Hat has been notified about a possible heap overflow vulnerability
in kernel networking, specifically in the macsec.c module. We have
assigned a CVE-2017-7477 for this issue. Corresponding commit which
fixes this issue can be found at [1]. There is no preliminary impact
available as of now.

Short description:

A heap overflow vulnerability was found in the Linux kernel in macsec
module. Specifying MAX_SKB_FRAGS + 1 and using NETIF_F_FRAGLIST which
calls skb_to_sgvec will overflow the heap.

This is now available as a Red Hat bugzilla at [2].

[1]
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=4d6fa57b4dab0d77f4d8e9d9c73d1e63f6fe8fee
[2] https://bugzilla.redhat.com/show_bug.cgi?id=1445207

Best Regards,

-- 
Andrej Nemec, Red Hat Product Security
3701 3214 E472 A9C3 EFBE 8A63 8904 44A1 D57B 6DDA

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