CVE-2018-6922

Description

One of the data structures that holds TCP segments in all versions of FreeBSD prior to 11.2-RELEASE-p1, 11.1-RELEASE-p12, and 10.4-RELEASE-p10 uses an inefficient algorithm to reassemble the data. This causes the CPU time spent on segment processing to grow linearly with the number of segments in the reassembly queue. An attacker who has the ability to send TCP traffic to a victim system can degrade the victim system's network performance and/or consume excessive CPU by exploiting the inefficiency of TCP reassembly handling, with relatively small bandwidth cost.

Category

5.3
CVSS
Severity: Medium
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.70% Top 30%
Vendor Advisory freebsd.org
Affected: FreeBSD FreeBSD
Published at:
Updated at:

References

Link Tags
https://www.freebsd.org/security/advisories/FreeBSD-SA-18:08.tcp.asc patch vendor advisory
http://www.securitytracker.com/id/1041425 third party advisory vdb entry
https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html patch
http://www.securityfocus.com/bid/105058 third party advisory vdb entry
https://security.netapp.com/advisory/ntap-20180815-0002/ third party advisory

Frequently Asked Questions

What is the severity of CVE-2018-6922?
CVE-2018-6922 has been scored as a medium severity vulnerability.
How to fix CVE-2018-6922?
To fix CVE-2018-6922, 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-2018-6922 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2018-6922 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2018-6922?
CVE-2018-6922 affects FreeBSD FreeBSD.
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