|Description||Linux kernel: heap out-of-bounds in AF_PACKET sockets. This new issue is analogous to previously disclosed CVE-2016-8655. In both cases, a socket option that changes socket state may race with safety checks in packet_set_ring. Previously with PACKET_VERSION. This time with PACKET_RESERVE. The solution is similar: lock the socket for the update. This issue may be exploitable, we did not investigate further. As this issue affects PF_PACKET sockets, it requires CAP_NET_RAW in the process namespace. But note that with user namespaces enabled, any process can create a namespace in which it has CAP_NET_RAW.|
|Source||CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SuSE, Mageia, GitHub code/issues, web search, more)|
|NVD severity||high (attack range: local)|
Vulnerable and fixed packages
The table below lists information on source packages.
The information below is based on the following data on fixed versions.
Introduced by: https://git.kernel.org/linus/8913336a7e8d56e984109a3137d6c0e3362596a4 (2.6.27-rc1)
Fixed by: https://git.kernel.org/linus/c27927e372f0785f3303e8fad94b85945e2c97b7
Non-privileged user namespaces disabled by default, only exploitable by arbitrary user if sysctl kernel.unprivileged_userns_clone=1