{"answers":{"affected":"It affects 4 products.","exploited":"There is no known exploitation of CVE-2021-4154 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-4154 is a high-severity use after free vulnerability in Linux kernel, published on 4 Feb 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-2021-4154 and fix it if it is affected.\n\nWhat it is: CVE-2021-4154 is a high-severity use after free vulnerability in Linux kernel, published on 4 Feb 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-2021-4154 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-2021-4154/ (Markdown: https://insights.sbomify.com/CVE-2021-4154/index.md)","id":"CVE-2021-4154","markdown":"https://insights.sbomify.com/CVE-2021-4154/index.md","name":"CVE-2021-4154","record":{"aliases":["A-218836280","ASB-A-218836280","DEBIAN-CVE-2021-4154","GHSA-qvm5-4fh7-hcfx","UBUNTU-CVE-2021-4154"],"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 cgroup parser to escalate privileges and cause denial of service.","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":"hci_baseboard_management_controller","vendor":"netapp"},{"product":"enterprise_linux","vendor":"redhat"},{"product":"virtualization","vendor":"redhat"}],"cvss":{"score":8.8,"severity":"high","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-416","name":"Use After Free"}],"description":"A use-after-free flaw was found in cgroup1_parse_param in kernel/cgroup/cgroup-v1.c in the Linux kernel's cgroup v1 parser. A local attacker with a user privilege could cause a privilege escalation by exploiting the fsconfig syscall parameter leading to a container breakout and a denial of service on the system.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2022-08-11","github_poc":2,"max_poc_stars":66,"metasploit":0,"nuclei":0,"refs":[{"date":"2022-08-11T05:46:27Z","kind":"github_poc","ref":"https://github.com/Markakd/CVE-2021-4154","stars":66,"title":"CVE-2021-4154 exploit"},{"date":"2023-02-23T08:38:22Z","kind":"github_poc","ref":"https://github.com/veritas501/CVE-2021-4154","stars":7,"title":"CVE-2021-4154"}],"tier":"poc_unverified"},"has_fix":true,"headline":"Use after free in kernel","id":"CVE-2021-4154","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel","redhat:enterprise_linux","redhat:virtualization"],"type":"use_after_free","year":"2021"},"n_packages":0,"n_references":4,"next":{"headline":"Information disclosure in kernel","id":"CVE-2021-4155"},"packages":[],"prev":{"headline":"Use after free in kernel","id":"CVE-2021-4150"},"products":["kernel"],"published":"2022-02-04","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":"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":"2024-08-03","vendors":["n/a"]},"summary":"A local attacker can exploit a use-after-free in the Linux kernel cgroup parser to escalate privileges and cause denial of service.","url":"https://insights.sbomify.com/CVE-2021-4154/"}