CVE-2017-7477

Published: 25 April 2017

Heap-based buffer overflow in drivers/net/macsec.c in the MACsec module in the Linux kernel through 4.10.12 allows attackers to cause a denial of service or possibly have unspecified other impact by leveraging the use of a MAX_SKB_FRAGS+1 size in conjunction with the NETIF_F_FRAGLIST feature, leading to an error in the skb_to_sgvec function.

From the Ubuntu Security Team

Jason Donenfeld discovered a heap overflow in the MACsec module in the Linux kernel. An attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

Mitigation

Blacklist the MACsec kernel module

Status

Severity score breakdown

References

• http://www.openwall.com/lists/oss-security/2017/04/24/4
• http://www.openwall.com/lists/oss-security/2017/04/25/7
• http://www.openwall.com/lists/oss-security/2017/04/26/8
• https://ubuntu.com/security/notices/USN-3293-1
• https://ubuntu.com/security/notices/USN-3292-1
• https://ubuntu.com/security/notices/USN-3292-2
• https://www.cve.org/CVERecord?id=CVE-2017-7477
• NVD
• Launchpad
• Debian

Bugs

• https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1685892