CVE-2017-18017: Use After Free
Last updated 4 July 2026
Other sources
The tcpmssmanglepacket function in net/netfilter/xtTCPMSS.c in the Linux kernel before 4.11, and 4.9.x before 4.9.36, allows remote attackers to cause a denial of service (use-after-free and memory corruption) or possibly have unspecified other impact by leveraging the presence of xtTCPMSS in an iptables action.
— Launchpad
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/linuxto a version that resolves this vulnerability.Fixed in 5.10.223-1Fixed in 5.10.262-1Fixed in 6.1.176-1Fixed in 6.1.180-1Fixed in 6.12.94-1Fixed in 6.12.101-1Fixed in 7.1.7-1Fixed in 7.1.8-1 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Patch 746618
Event History
Frequently Asked Questions
What is the vulnerability ID?
The vulnerability ID is CVE-2017-18017.
What is the severity level of CVE-2017-18017?
The severity level of CVE-2017-18017 is medium.
What is the affected software?
The affected software includes Linux kernel versions before 4.11 and 4.9.x before 4.9.36.
What is the impact of CVE-2017-18017?
The impact of CVE-2017-18017 includes denial of service (use-after-free and memory corruption) or possibly other unspecified impacts.
Are there any remediation steps available?
Yes, updating the Linux kernel to version 4.11 or higher can address the vulnerability.