Published: 01/03/2017 Updated: 10/02/2023

CVSS v2 Base Score: 7.2 | Impact Score: 10 | Exploitability Score: 3.9

CVSS v3 Base Score: 7.8 | Impact Score: 5.9 | Exploitability Score: 1.8

VMScore: 641

Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

The ip_cmsg_recv_checksum function in net/ipv4/ip_sockglue.c in the Linux kernel prior to 4.10.1 has incorrect expectations about skb data layout, which allows local users to cause a denial of service (buffer over-read) or possibly have unspecified other impact via crafted system calls, as demonstrated by use of the MSG_MORE flag in conjunction with loopback UDP transmission.

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linux linux kernel

Several security issues were fixed in the Linux kernel ...

Several security issues were fixed in the kernel ...

The skbs processed by ip_cmsg_recv() are not guaranteed to be linear (eg when sending UDP packets over loopback with MSGMORE) Using csum_partial() on potentially the whole skb len is dangerous; instead be on the safe side and use skb_checksum() This may lead to an infoleak as the kernel memory may be checksummed and sent as part of the packet ...

CWE-125 https://github.com/torvalds/linux/commit/ca4ef4574f1ee5252e2cd365f8f5d5bafd048f32 https://bugzilla.redhat.com/show_bug.cgi?id=1427984 http://www.openwall.com/lists/oss-security/2017/02/28/5 http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.10.1 http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ca4ef4574f1ee5252e2cd365f8f5d5bafd048f32 http://www.securityfocus.com/bid/96487 https://nvd.nist.gov https://usn.ubuntu.com/3361-1/

CVE-2017-6347

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