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Vulnerability record · CVE-2018-5391 · published 6 September 2018

CVE-2018-5391: Linux kernel uncontrolled resource consumption vulnerability

Linux · Linux Kernel

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.

7.5 CVSS 3.1 High EPSS 32% · top 1.7% CWE-400 · Uncontrolled resource consumptionCWE-20 · Improper input validation
7.5CVSS 3.1 base score, v2 7.8
32%EPSS exploitation probability, 30 days
NoNot in CISA KEV
51Affected product versions listed by NVD
70References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

51 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2018-004.txt Third Party Advisory
http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20200115-01-linux-en Broken Link
http://www.openwall.com/lists/oss-security/2019/06/28/2 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2019/07/06/3 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2019/07/06/4 Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/105108 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1041476 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1041637 Third Party AdvisoryVDB Entry
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 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3590 Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-377115.pdf Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/commit/?id=c30f1fc041b74ecdb072dd44f858750414b8b19f PatchVendor Advisory
https://lists.debian.org/debian-lts-announce/2018/08/msg00014.html Mailing ListMitigationThird Party Advisory
https://lists.debian.org/debian-lts-announce/2019/03/msg00017.html Mailing ListThird Party Advisory
https://security.netapp.com/advisory/ntap-20181003-0002/ Third Party Advisory
https://support.f5.com/csp/article/K74374841?utm_source=f5support&amp%3Butm_medium=RSS
https://usn.ubuntu.com/3740-1/ Third Party Advisory
https://usn.ubuntu.com/3740-2/ Third Party Advisory
https://usn.ubuntu.com/3741-1/ Third Party Advisory
https://usn.ubuntu.com/3741-2/ Third Party Advisory
https://usn.ubuntu.com/3742-1/ Third Party Advisory
https://usn.ubuntu.com/3742-2/ Third Party Advisory
https://www.debian.org/security/2018/dsa-4272 MitigationThird Party Advisory
https://www.kb.cert.org/vuls/id/641765 Third Party AdvisoryUS Government Resource
http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2018-004.txt Third Party Advisory
http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20200115-01-linux-en Broken Link
http://www.openwall.com/lists/oss-security/2019/06/28/2 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2019/07/06/3 Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2019/07/06/4 Mailing ListThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2018-5391), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.