CVE-2018-5391
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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 32.4%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
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
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 32.45% probability · 98th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-400, CWE-20
- Affected
- linux/linux kernel · redhat/enterprise linux desktop · redhat/enterprise linux server · redhat/enterprise linux server aus · redhat/enterprise linux server eus · redhat/enterprise linux server tus · redhat/enterprise linux workstation · debian/debian linux · canonical/ubuntu linux · microsoft/windows 10 · microsoft/windows 7 · microsoft/windows 8.1 · microsoft/windows rt 8.1 · microsoft/windows server 2008 · microsoft/windows server 2012 · microsoft/windows server 2016 · f5/big-ip access policy manager · f5/big-ip advanced firewall manager · f5/big-ip analytics · f5/big-ip application acceleration manager · +31 more
- Source
- cret@cert.org
EPSS 32.4% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2018-004.txtThird Party Advisory
- http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20200115-01-linux-enBroken Link
- http://www.openwall.com/lists/oss-security/2019/06/28/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2019/07/06/3Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2019/07/06/4Mailing List, Third Party Advisory
- http://www.securityfocus.com/bid/105108Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1041476Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1041637Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:2785Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2791Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2846Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2924Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2925Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2933Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2948Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3083Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3096Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3459Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3540Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3586Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3590Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-377115.pdfThird Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/commit/?id=c30f1fc041b74ecdb072dd44f858750414b8b19fPatch, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2018/08/msg00014.htmlMailing List, Mitigation, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/03/msg00017.htmlMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20181003-0002/Third Party Advisory
- https://support.f5.com/csp/article/K74374841?utm_source=f5support&%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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.