What’s Vulnerable › Vulnerabilities

CVE-2017-6347

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-03-01 · updated 2026-06-17
• Weakness: CWE-125

Description

The ip_cmsg_recv_checksum function in net/ipv4/ip_sockglue.c in the Linux kernel before 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.

Affected products

• Linux kernel: from 4.0 before 4.4.52; from 4.5 before 4.9.13; from 4.10 before 4.10.1 — fixed in 4.10.1, 4.4.52, 4.9.13

How to fix

Upgrade to a fixed version: Linux kernel 4.10.1, 4.4.52, 4.9.13. Check the vendor advisory for mitigations.

References

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

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