CVE-2018-5391

high-risk
Published 2018-09-06

The Linux kernel, versions 3.9+, is vulnerable to a denial of service attack with low rates of specially modified packets targeting IP fragment re-assembly. An attacker may cause a denial of service condition by sending specially crafted IP fragments. Various vulnerabilities in IP fragmentation have been discovered and fixed over the years. The current vulnerability (CVE-2018-5391) became exploitable in the Linux kernel with the increase of the IP fragment reassembly queue size.

Do I need to act?

~
3.8% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
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 7.5/10 High
NETWORK / LOW complexity

Affected Products (20)

Affected Vendors

Debian Redhat Microsoft Linux Siemens F5 Canonical

References (70)

Third Party Advisory http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2018-004.txt
Broken Link http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20200115-01-linux-e...
Mailing List http://www.openwall.com/lists/oss-security/2019/06/28/2
Mailing List http://www.openwall.com/lists/oss-security/2019/07/06/3
Mailing List http://www.openwall.com/lists/oss-security/2019/07/06/4
Third Party Advisory http://www.securityfocus.com/bid/105108
Third Party Advisory http://www.securitytracker.com/id/1041476
Third Party Advisory http://www.securitytracker.com/id/1041637
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:2785
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:2791
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:2846
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:2924
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:2925
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:2933
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:2948
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3083
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3096
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3459
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3540
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:3586
and 50 more references
61
/ 100
high-risk
Severity 26/34 · High
Exploitability 7/34 · Low
Exposure 28/34 · Critical