{"answers":{"affected":"It affects 51 products.","exploited":"There is no known exploitation of CVE-2018-5391 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2018-5391 is a high-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 6 Sep 2018. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2018-5391 and fix it if it is affected.\n\nWhat it is: CVE-2018-5391 is a high-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 6 Sep 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2018-5391 in the wild and no public exploit code.\n\nAffected product: Canonical Ubuntu Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2018-5391/ (Markdown: https://insights.sbomify.com/CVE-2018-5391/index.md)","id":"CVE-2018-5391","markdown":"https://insights.sbomify.com/CVE-2018-5391/index.md","name":"CVE-2018-5391","record":{"aliases":["DEBIAN-CVE-2018-5391","DSA-4272-1","GHSA-p6x5-xg7h-fj5h","SUSE-SU-2018:3792-1","SUSE-SU-2018:3860-1","SUSE-SU-2018:3881-1","UBUNTU-CVE-2018-5391"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Linux kernel","requires_auth":"none","summary":"An attacker can cause a denial of service in the Linux kernel by sending specially crafted IP fragments, affecting system availability.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"certcc","cpe":[{"product":"ubuntu_linux","vendor":"canonical"},{"product":"debian_linux","vendor":"debian"},{"product":"big-ip_access_policy_manager","vendor":"f5"},{"product":"big-ip_advanced_firewall_manager","vendor":"f5"},{"product":"big-ip_analytics","vendor":"f5"},{"product":"big-ip_application_acceleration_manager","vendor":"f5"},{"product":"big-ip_application_security_manager","vendor":"f5"},{"product":"big-ip_domain_name_system","vendor":"f5"},{"product":"big-ip_edge_gateway","vendor":"f5"},{"product":"big-ip_fraud_protection_service","vendor":"f5"},{"product":"big-ip_global_traffic_manager","vendor":"f5"},{"product":"big-ip_link_controller","vendor":"f5"},{"product":"big-ip_local_traffic_manager","vendor":"f5"},{"product":"big-ip_policy_enforcement_manager","vendor":"f5"},{"product":"big-ip_webaccelerator","vendor":"f5"},{"product":"linux_kernel","vendor":"linux"},{"product":"windows_10","vendor":"microsoft"},{"product":"windows_7","vendor":"microsoft"},{"product":"windows_8.1","vendor":"microsoft"},{"product":"windows_rt_8.1","vendor":"microsoft"},{"product":"windows_server_2008","vendor":"microsoft"},{"product":"windows_server_2012","vendor":"microsoft"},{"product":"windows_server_2016","vendor":"microsoft"},{"product":"enterprise_linux_desktop","vendor":"redhat"},{"product":"enterprise_linux_server","vendor":"redhat"},{"product":"enterprise_linux_server_aus","vendor":"redhat"},{"product":"enterprise_linux_server_eus","vendor":"redhat"},{"product":"enterprise_linux_server_tus","vendor":"redhat"},{"product":"enterprise_linux_workstation","vendor":"redhat"},{"product":"ruggedcom_rm1224_firmware","vendor":"siemens"},{"product":"ruggedcom_rox_ii_firmware","vendor":"siemens"},{"product":"scalance_m-800_firmware","vendor":"siemens"},{"product":"scalance_s615_firmware","vendor":"siemens"},{"product":"scalance_sc-600_firmware","vendor":"siemens"},{"product":"scalance_w1700_ieee_802.11ac_firmware","vendor":"siemens"},{"product":"scalance_w700_ieee_802.11a\\/b\\/g\\/n_firmware","vendor":"siemens"},{"product":"simatic_net_cp_1242-7_firmware","vendor":"siemens"},{"product":"simatic_net_cp_1243-1_firmware","vendor":"siemens"},{"product":"simatic_net_cp_1243-7_lte_eu_firmware","vendor":"siemens"},{"product":"simatic_net_cp_1243-7_lte_us_firmware","vendor":"siemens"},{"product":"simatic_net_cp_1243-8_irc_firmware","vendor":"siemens"},{"product":"simatic_net_cp_1542sp-1_firmware","vendor":"siemens"},{"product":"simatic_net_cp_1542sp-1_irc_firmware","vendor":"siemens"},{"product":"simatic_net_cp_1543-1_firmware","vendor":"siemens"},{"product":"simatic_net_cp_1543sp-1_firmware","vendor":"siemens"},{"product":"simatic_rf185c_firmware","vendor":"siemens"},{"product":"simatic_rf186c_firmware","vendor":"siemens"},{"product":"simatic_rf186ci_firmware","vendor":"siemens"},{"product":"simatic_rf188_firmware","vendor":"siemens"},{"product":"simatic_rf188ci_firmware","vendor":"siemens"},{"product":"sinema_remote_connect_server_firmware","vendor":"siemens"}],"cvss":{"score":7.5,"severity":"high","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-20","name":"Improper Input Validation"},{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"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.","ecosystems":["SUSE:Linux Enterprise Live Patching 12 SP3","SUSE:Linux Enterprise Live Patching 15","SUSE:Linux Enterprise Server 12 SP2-LTSS","SUSE:Linux Enterprise Server for SAP Applications 12 SP2"],"exploits":{"exploitdb":0,"first_seen":"2026-09-11","github_poc":1,"max_poc_stars":0,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-09-11T17:46:32Z","kind":"github_poc","ref":"https://github.com/zeinabmazraani/OverlapCraft","stars":0,"title":"An attacker and detector built to escalate against each other around overlapping IP fragments. Three attack modes exploit fragment reassembly in increasingly subtle ways, the last inspired by FragmentSmack (CVE-2018-5391), and three detector versions evolve in response, from simple overlap detection to defending against resource exhaustion."}],"tier":"poc_unverified"},"has_fix":true,"headline":"Denial of service in Kernel","id":"CVE-2018-5391","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"canonical:ubuntu_linux","products":["canonical:ubuntu_linux","debian:debian_linux","f5:big-ip_access_policy_manager","f5:big-ip_advanced_firewall_manager","f5:big-ip_analytics","f5:big-ip_application_acceleration_manager","f5:big-ip_application_security_manager","f5:big-ip_domain_name_system","f5:big-ip_edge_gateway","f5:big-ip_fraud_protection_service","f5:big-ip_global_traffic_manager","f5:big-ip_link_controller","f5:big-ip_local_traffic_manager","f5:big-ip_policy_enforcement_manager","f5:big-ip_webaccelerator","linux:linux_kernel","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","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"],"type":"denial_of_service","year":"2018"},"n_packages":22,"n_references":35,"next":{"headline":"mingw-w64 version 5.0.4 by default produces executables that opt in to ASLR, but are not compatible with ASLR","id":"CVE-2018-5392"},"packages":[{"ecosystem":"SUSE:Linux Enterprise Live Patching 12 SP3","fixed":["8-2.1"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP3_Update_10","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP3_Update_10\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2012%20SP3","source":"SUSE-SU-2018:3860-1"},{"ecosystem":"SUSE:Linux Enterprise Live Patching 12 SP3","fixed":["8-2.1"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP3_Update_11","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP3_Update_11\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2012%20SP3","source":"SUSE-SU-2018:3860-1"},{"ecosystem":"SUSE:Linux Enterprise Live Patching 12 SP3","fixed":["6-2.1"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP3_Update_12","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP3_Update_12\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2012%20SP3","source":"SUSE-SU-2018:3860-1"},{"ecosystem":"SUSE:Linux Enterprise Live Patching 12 SP3","fixed":["6-2.1"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP3_Update_13","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP3_Update_13\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2012%20SP3","source":"SUSE-SU-2018:3860-1"},{"ecosystem":"SUSE:Linux Enterprise Live Patching 12 SP3","fixed":["5-2.1"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP3_Update_14","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP3_Update_14\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2012%20SP3","source":"SUSE-SU-2018:3860-1"},{"ecosystem":"SUSE:Linux Enterprise Live Patching 12 SP3","fixed":["5-2.1"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP3_Update_15","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP3_Update_15\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2012%20SP3","source":"SUSE-SU-2018:3860-1"},{"ecosystem":"SUSE:Linux Enterprise Live Patching 12 SP3","fixed":["9-2.1"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP3_Update_8","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP3_Update_8\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2012%20SP3","source":"SUSE-SU-2018:3860-1"},{"ecosystem":"SUSE:Linux Enterprise Live Patching 12 SP3","fixed":["9-2.1"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP3_Update_9","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP3_Update_9\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2012%20SP3","source":"SUSE-SU-2018:3860-1"},{"ecosystem":"SUSE:Linux Enterprise Live Patching 15","fixed":["6-2.1"],"introduced":["0"],"last_affected":[],"package":"kernel-livepatch-SLE15_Update_1","purl":"pkg:rpm/suse/kernel-livepatch-SLE15_Update_1\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015","source":"SUSE-SU-2018:3881-1"},{"ecosystem":"SUSE:Linux Enterprise Live Patching 15","fixed":["6-2.1"],"introduced":["0"],"last_affected":[],"package":"kernel-livepatch-SLE15_Update_2","purl":"pkg:rpm/suse/kernel-livepatch-SLE15_Update_2\u0026distro=SUSE%20Linux%20Enterprise%20Live%20Patching%2015","source":"SUSE-SU-2018:3881-1"},{"ecosystem":"SUSE:Linux Enterprise Server 12 SP2-LTSS","fixed":["9-2.1"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP2_Update_18","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP2_Update_18\u0026distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-LTSS","source":"SUSE-SU-2018:3792-1"},{"ecosystem":"SUSE:Linux Enterprise Server 12 SP2-LTSS","fixed":["9-2.1"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP2_Update_19","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP2_Update_19\u0026distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-LTSS","source":"SUSE-SU-2018:3792-1"},{"ecosystem":"SUSE:Linux Enterprise Server 12 SP2-LTSS","fixed":["8-2.1"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP2_Update_20","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP2_Update_20\u0026distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-LTSS","source":"SUSE-SU-2018:3792-1"},{"ecosystem":"SUSE:Linux Enterprise Server 12 SP2-LTSS","fixed":["7-2.1"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP2_Update_21","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP2_Update_21\u0026distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-LTSS","source":"SUSE-SU-2018:3792-1"},{"ecosystem":"SUSE:Linux Enterprise Server 12 SP2-LTSS","fixed":["7-2.1"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP2_Update_22","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP2_Update_22\u0026distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-LTSS","source":"SUSE-SU-2018:3792-1"},{"ecosystem":"SUSE:Linux Enterprise Server 12 SP2-LTSS","fixed":["5-2.1"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP2_Update_23","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP2_Update_23\u0026distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-LTSS","source":"SUSE-SU-2018:3792-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 12 SP2","fixed":["9-2.1"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP2_Update_18","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP2_Update_18\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP2","source":"SUSE-SU-2018:3792-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 12 SP2","fixed":["9-2.1"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP2_Update_19","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP2_Update_19\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP2","source":"SUSE-SU-2018:3792-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 12 SP2","fixed":["8-2.1"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP2_Update_20","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP2_Update_20\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP2","source":"SUSE-SU-2018:3792-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 12 SP2","fixed":["7-2.1"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP2_Update_21","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP2_Update_21\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP2","source":"SUSE-SU-2018:3792-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 12 SP2","fixed":["7-2.1"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP2_Update_22","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP2_Update_22\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP2","source":"SUSE-SU-2018:3792-1"},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 12 SP2","fixed":["5-2.1"],"introduced":["0"],"last_affected":[],"package":"kgraft-patch-SLE12-SP2_Update_23","purl":"pkg:rpm/suse/kgraft-patch-SLE12-SP2_Update_23\u0026distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP2","source":"SUSE-SU-2018:3792-1"}],"prev":{"headline":"Denial of service in Linux Kernel","id":"CVE-2018-5390"},"products":["Kernel"],"published":"2018-09-06","related":[{"cvss_score":9.8,"headline":"SaltStack Salt Authentication Bypass","id":"CVE-2020-11651","kev_date_added":"2021-11-03","published":"2020-04-30"},{"cvss_score":9.8,"headline":"OpenSMTPD Remote Code Execution","id":"CVE-2020-7247","kev_date_added":"2022-03-25","published":"2020-01-29"},{"cvss_score":9.8,"headline":"Exim Out-of-bounds Write","id":"CVE-2019-16928","kev_date_added":"2022-03-03","published":"2019-09-27"},{"cvss_score":9.8,"headline":"Exim Buffer Overflow","id":"CVE-2018-6789","kev_date_added":"2021-11-03","published":"2018-02-08"},{"cvss_score":9.8,"headline":"Oracle Java SE and Java SE Embedded Remote Code Execution","id":"CVE-2015-2590","kev_date_added":"2022-03-03","published":"2015-07-16"},{"cvss_score":9.8,"headline":"Oracle JRE Remote Code Execution","id":"CVE-2013-0422","kev_date_added":"2022-05-25","published":"2013-01-10"},{"cvss_score":9.8,"headline":"Oracle Java SE Runtime Environment (JRE) Arbitrary Code Execution","id":"CVE-2011-3544","kev_date_added":"2022-03-03","published":"2011-10-19"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"SUSE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-05","vendors":["Linux"]},"summary":"An attacker can cause a denial of service in the Linux kernel by sending specially crafted IP fragments, affecting system availability.","url":"https://insights.sbomify.com/CVE-2018-5391/"}