{"answers":{"affected":"It affects 10 products.","exploited":"There is no known exploitation of CVE-2018-18397 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2018-18397 is a medium-severity missing authorization vulnerability in Canonical Ubuntu Linux, published on 12 Dec 2018. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2018-18397 and fix it if it is affected.\n\nWhat it is: CVE-2018-18397 is a medium-severity missing authorization vulnerability in Canonical Ubuntu Linux, published on 12 Dec 2018. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2018-18397 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-2018-18397/ (Markdown: https://insights.sbomify.com/CVE-2018-18397/index.md)","id":"CVE-2018-18397","markdown":"https://insights.sbomify.com/CVE-2018-18397/index.md","name":"CVE-2018-18397","record":{"aliases":["DEBIAN-CVE-2018-18397","GHSA-7cx6-7887-9rwv","RHSA-2019:0202","RHSA-2019:0324","UBUNTU-CVE-2018-18397"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["data_modify"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"Local users can write data to holes in read-only tmpfs files due to improper access control in the Linux kernel userfaultfd implementation.","user_interaction":"not_required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"ubuntu_linux","vendor":"canonical"},{"product":"linux_kernel","vendor":"linux"},{"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":"openshift_container_platform","vendor":"redhat"},{"product":"virtualization_host","vendor":"redhat"}],"cvss":{"score":5.5,"severity":"medium","source":"nvd","vector":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","version":"3.0"},"cwes":[{"id":"CWE-863","name":"Incorrect Authorization"}],"description":"The userfaultfd implementation in the Linux kernel before 4.19.7 mishandles access control for certain UFFDIO_ ioctl calls, as demonstrated by allowing local users to write data into holes in a tmpfs file (if the user has read-only access to that file, and that file contains holes), related to fs/userfaultfd.c and mm/userfaultfd.c.","ecosystems":["Red Hat:rhel_eus:7.4::computenode","Red Hat:rhel_eus:7.4::server","Red Hat:rhel_eus:7.5::computenode","Red Hat:rhel_eus:7.5::server"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Missing authorization in n/a","id":"CVE-2018-18397","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"canonical:ubuntu_linux","products":["canonical:ubuntu_linux","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","redhat:openshift_container_platform","redhat:virtualization_host"],"type":"missing_authorization","year":"2018"},"n_packages":86,"n_references":14,"next":{"headline":"Memory corruption in n/a","id":"CVE-2018-18398"},"packages":[{"ecosystem":"Red Hat:rhel_eus:7.4::computenode","fixed":["0:3.10.0-693.44.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel","purl":"pkg:rpm/redhat/kernel","source":"RHSA-2019:0324"},{"ecosystem":"Red Hat:rhel_eus:7.4::computenode","fixed":["0:3.10.0-693.44.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-abi-whitelists","purl":"pkg:rpm/redhat/kernel-abi-whitelists","source":"RHSA-2019:0324"},{"ecosystem":"Red Hat:rhel_eus:7.4::computenode","fixed":["0:3.10.0-693.44.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-debug","purl":"pkg:rpm/redhat/kernel-debug","source":"RHSA-2019:0324"},{"ecosystem":"Red Hat:rhel_eus:7.4::computenode","fixed":["0:3.10.0-693.44.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-debuginfo","purl":"pkg:rpm/redhat/kernel-debug-debuginfo","source":"RHSA-2019:0324"},{"ecosystem":"Red Hat:rhel_eus:7.4::computenode","fixed":["0:3.10.0-693.44.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-devel","purl":"pkg:rpm/redhat/kernel-debug-devel","source":"RHSA-2019:0324"},{"ecosystem":"Red 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Hat:rhel_eus:7.4::server","fixed":["0:3.10.0-693.44.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-tools-libs","purl":"pkg:rpm/redhat/kernel-tools-libs","source":"RHSA-2019:0324"},{"ecosystem":"Red Hat:rhel_eus:7.4::server","fixed":["0:3.10.0-693.44.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-tools-libs-devel","purl":"pkg:rpm/redhat/kernel-tools-libs-devel","source":"RHSA-2019:0324"},{"ecosystem":"Red Hat:rhel_eus:7.4::server","fixed":["0:3.10.0-693.44.1.el7"],"introduced":["0"],"last_affected":[],"package":"perf","purl":"pkg:rpm/redhat/perf","source":"RHSA-2019:0324"}],"prev":{"headline":"Code injection in ThingsPro IIoT Gateway and Device Management Software Solutions","id":"CVE-2018-18396"},"products":["n/a"],"published":"2018-12-12","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":"Red Hat","prefix":"RHSA"},{"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)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-05","vendors":["n/a"]},"summary":"Local users can write data to holes in read-only tmpfs files due to improper access control in the Linux kernel userfaultfd implementation.","url":"https://insights.sbomify.com/CVE-2018-18397/"}