{"answers":{"affected":"It affects 2 products.","exploited":"There is no known exploitation of CVE-2021-4028 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-4028 is a high-severity use after free vulnerability in Linux kernel, published on 24 Aug 2022. 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-2021-4028 and fix it if it is affected.\n\nWhat it is: CVE-2021-4028 is a high-severity use after free vulnerability in Linux kernel, published on 24 Aug 2022. 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-2021-4028 in the wild and no public exploit code.\n\nAffected product: Linux kernel. 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-2021-4028/ (Markdown: https://insights.sbomify.com/CVE-2021-4028/index.md)","id":"CVE-2021-4028","markdown":"https://insights.sbomify.com/CVE-2021-4028/index.md","name":"CVE-2021-4028","record":{"aliases":["DEBIAN-CVE-2021-4028","GHSA-qfcc-9m6r-r23m","RHSA-2022:2188","UBUNTU-CVE-2021-4028"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["privilege_escalation","denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A local attacker can exploit a use-after-free in the Linux kernel RDMA listener to crash the system or escalate privileges.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[{"product":"linux_kernel","vendor":"linux"},{"product":"linux_enterprise","vendor":"suse"}],"cvss":{"score":7.8,"severity":"high","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-416","name":"Use After Free"}],"description":"A flaw in the Linux kernel's implementation of RDMA communications manager listener code allowed an attacker with local access to setup a socket to listen on a high port allowing for a list element to be used after free. Given the ability to execute code, a local attacker could leverage this use-after-free to crash the system or possibly escalate privileges on the system.","ecosystems":["Red Hat:rhel_aus:7.4::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":"Use after free in kernel","id":"CVE-2021-4028","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel","suse:linux_enterprise"],"type":"use_after_free","year":"2021"},"n_packages":17,"n_references":6,"next":{"headline":"Command injection in ARMOR Z1 (NBG6816) firmware","id":"CVE-2021-4029"},"packages":[{"ecosystem":"Red Hat:rhel_aus:7.4::server","fixed":["0:3.10.0-693.100.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel","purl":"pkg:rpm/redhat/kernel","source":"RHSA-2022:2188"},{"ecosystem":"Red Hat:rhel_aus:7.4::server","fixed":["0:3.10.0-693.100.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-abi-whitelists","purl":"pkg:rpm/redhat/kernel-abi-whitelists","source":"RHSA-2022:2188"},{"ecosystem":"Red Hat:rhel_aus:7.4::server","fixed":["0:3.10.0-693.100.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-debug","purl":"pkg:rpm/redhat/kernel-debug","source":"RHSA-2022:2188"},{"ecosystem":"Red Hat:rhel_aus:7.4::server","fixed":["0:3.10.0-693.100.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-debuginfo","purl":"pkg:rpm/redhat/kernel-debug-debuginfo","source":"RHSA-2022:2188"},{"ecosystem":"Red Hat:rhel_aus:7.4::server","fixed":["0:3.10.0-693.100.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-debug-devel","purl":"pkg:rpm/redhat/kernel-debug-devel","source":"RHSA-2022:2188"},{"ecosystem":"Red Hat:rhel_aus:7.4::server","fixed":["0:3.10.0-693.100.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-debuginfo","purl":"pkg:rpm/redhat/kernel-debuginfo","source":"RHSA-2022:2188"},{"ecosystem":"Red Hat:rhel_aus:7.4::server","fixed":["0:3.10.0-693.100.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-debuginfo-common-x86_64","purl":"pkg:rpm/redhat/kernel-debuginfo-common-x86_64","source":"RHSA-2022:2188"},{"ecosystem":"Red Hat:rhel_aus:7.4::server","fixed":["0:3.10.0-693.100.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-devel","purl":"pkg:rpm/redhat/kernel-devel","source":"RHSA-2022:2188"},{"ecosystem":"Red Hat:rhel_aus:7.4::server","fixed":["0:3.10.0-693.100.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-doc","purl":"pkg:rpm/redhat/kernel-doc","source":"RHSA-2022:2188"},{"ecosystem":"Red Hat:rhel_aus:7.4::server","fixed":["0:3.10.0-693.100.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-tools","purl":"pkg:rpm/redhat/kernel-tools","source":"RHSA-2022:2188"},{"ecosystem":"Red Hat:rhel_aus:7.4::server","fixed":["0:3.10.0-693.100.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-tools-debuginfo","purl":"pkg:rpm/redhat/kernel-tools-debuginfo","source":"RHSA-2022:2188"},{"ecosystem":"Red Hat:rhel_aus:7.4::server","fixed":["0:3.10.0-693.100.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-tools-libs","purl":"pkg:rpm/redhat/kernel-tools-libs","source":"RHSA-2022:2188"},{"ecosystem":"Red Hat:rhel_aus:7.4::server","fixed":["0:3.10.0-693.100.1.el7"],"introduced":["0"],"last_affected":[],"package":"kernel-tools-libs-devel","purl":"pkg:rpm/redhat/kernel-tools-libs-devel","source":"RHSA-2022:2188"},{"ecosystem":"Red Hat:rhel_aus:7.4::server","fixed":["0:3.10.0-693.100.1.el7"],"introduced":["0"],"last_affected":[],"package":"perf","purl":"pkg:rpm/redhat/perf","source":"RHSA-2022:2188"},{"ecosystem":"Red Hat:rhel_aus:7.4::server","fixed":["0:3.10.0-693.100.1.el7"],"introduced":["0"],"last_affected":[],"package":"perf-debuginfo","purl":"pkg:rpm/redhat/perf-debuginfo","source":"RHSA-2022:2188"},{"ecosystem":"Red Hat:rhel_aus:7.4::server","fixed":["0:3.10.0-693.100.1.el7"],"introduced":["0"],"last_affected":[],"package":"python-perf","purl":"pkg:rpm/redhat/python-perf","source":"RHSA-2022:2188"},{"ecosystem":"Red Hat:rhel_aus:7.4::server","fixed":["0:3.10.0-693.100.1.el7"],"introduced":["0"],"last_affected":[],"package":"python-perf-debuginfo","purl":"pkg:rpm/redhat/python-perf-debuginfo","source":"RHSA-2022:2188"}],"prev":{"headline":"Improper Access Control in bookstackapp/bookstack","id":"CVE-2021-4026"},"products":["kernel"],"published":"2022-08-24","related":[{"cvss_score":8.8,"headline":"Linux Kernel Out-of-Bounds Write","id":"CVE-2026-53266","kev_date_added":"2026-09-18","published":"2026-06-25"},{"cvss_score":8.8,"headline":"Linux Kernel Improper Input Validation","id":"CVE-2013-6282","kev_date_added":"2022-09-15","published":"2013-11-19"},{"cvss_score":8.4,"headline":"Linux Kernel Heap-Based Buffer Overflow","id":"CVE-2022-0185","kev_date_added":"2024-08-21","published":"2022-02-11"},{"cvss_score":8.4,"headline":"Linux Kernel Privilege Escalation","id":"CVE-2013-2094","kev_date_added":"2022-09-15","published":"2013-05-14"},{"cvss_score":7.8,"headline":"Linux Kernel Unspecified","id":"CVE-2026-53362","kev_date_added":"2026-08-27","published":"2026-07-04"},{"cvss_score":7.8,"headline":"Linux Kernel Missing Initialization of a Variable","id":"CVE-2026-46300","kev_date_added":"2026-10-28","published":"2026-05-23"},{"cvss_score":7.8,"headline":"Linux Kernel Race Condition","id":"CVE-2025-39964","kev_date_added":"2026-09-18","published":"2025-10-13"}],"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":"2024-08-03","vendors":["n/a"]},"summary":"A local attacker can exploit a use-after-free in the Linux kernel RDMA listener to crash the system or escalate privileges.","url":"https://insights.sbomify.com/CVE-2021-4028/"}