CVE-2016-9793

Description

The sock_setsockopt function in net/core/sock.c in the Linux kernel before 4.8.14 mishandles negative values of sk_sndbuf and sk_rcvbuf, which allows local users to cause a denial of service (memory corruption and system crash) or possibly have unspecified other impact by leveraging the CAP_NET_ADMIN capability for a crafted setsockopt system call with the (1) SO_SNDBUFFORCE or (2) SO_RCVBUFFORCE option.

Category

7.8
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 2.18% Top 20%
Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory kernel.org Vendor Advisory kernel.org Vendor Advisory github.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://github.com/torvalds/linux/commit/b98b0bc8c431e3ceb4b26b0dfc8db509518fb290 patch vendor advisory
http://www.securitytracker.com/id/1037968 third party advisory vdb entry
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b98b0bc8c431e3ceb4b26b0dfc8db509518fb290 patch vendor advisory
https://access.redhat.com/errata/RHSA-2017:0932 third party advisory vendor advisory
https://github.com/xairy/kernel-exploits/tree/master/CVE-2016-9793 third party advisory
http://www.securityfocus.com/bid/94655 third party advisory vdb entry
http://www.openwall.com/lists/oss-security/2016/12/03/1 patch mailing list third party advisory
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.8.14 release notes vendor advisory
https://access.redhat.com/errata/RHSA-2017:0933 third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2017:0931 third party advisory vendor advisory
https://source.android.com/security/bulletin/2017-03-01.html third party advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1402013 third party advisory issue tracking

Frequently Asked Questions

What is the severity of CVE-2016-9793?
CVE-2016-9793 has been scored as a high severity vulnerability.
How to fix CVE-2016-9793?
To fix CVE-2016-9793, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2016-9793 being actively exploited in the wild?
It is possible that CVE-2016-9793 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~2% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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