CVE-2017-1000111

moderate-risk
Published 2017-10-05

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.

Do I need to act?

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0.06% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.8/10 High
LOCAL / LOW complexity

Affected Products (19)

Affected Vendors

Linux Debian Redhat

References (16)

Third Party Advisory http://www.debian.org/security/2017/dsa-3981
Third Party Advisory http://www.securityfocus.com/bid/100267
Third Party Advisory http://www.securitytracker.com/id/1039132
Third Party Advisory https://access.redhat.com/errata/RHSA-2017:2918
Third Party Advisory https://access.redhat.com/errata/RHSA-2017:2930
Third Party Advisory https://access.redhat.com/errata/RHSA-2017:2931
Third Party Advisory https://access.redhat.com/errata/RHSA-2017:3200
Third Party Advisory https://access.redhat.com/security/cve/cve-2017-1000111
Third Party Advisory http://www.debian.org/security/2017/dsa-3981
Third Party Advisory http://www.securityfocus.com/bid/100267
Third Party Advisory http://www.securitytracker.com/id/1039132
Third Party Advisory https://access.redhat.com/errata/RHSA-2017:2918
Third Party Advisory https://access.redhat.com/errata/RHSA-2017:2930
Third Party Advisory https://access.redhat.com/errata/RHSA-2017:2931
Third Party Advisory https://access.redhat.com/errata/RHSA-2017:3200
Third Party Advisory https://access.redhat.com/security/cve/cve-2017-1000111
43
/ 100
moderate-risk
Severity 24/34 · High
Exploitability 0/34 · Minimal
Exposure 19/34 · Moderate