{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2023-54021 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2023-54021 is a vulnerability in Linux, published on 24 Dec 2025. 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-2023-54021 and fix it if it is affected.\n\nWhat it is: CVE-2023-54021 is a vulnerability in Linux, published on 24 Dec 2025. 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-2023-54021 in the wild and no public exploit code.\n\nAffected product: 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-2023-54021/ (Markdown: https://insights.sbomify.com/CVE-2023-54021/index.md)","id":"CVE-2023-54021","markdown":"https://insights.sbomify.com/CVE-2023-54021/index.md","name":"CVE-2023-54021","record":{"aliases":["BELL-CVE-2023-54021","DEBIAN-CVE-2023-54021","GHSA-xwm6-35hh-fmxm","UBUNTU-CVE-2023-54021"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel ext4","requires_auth":"low_privilege","summary":"A local attacker can trigger a kernel BUG_ON crash in the ext4 filesystem via an integer underflow, causing a denial of service.","user_interaction":"not_required","vuln_class":"integer_overflow"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: set goal start correctly in ext4_mb_normalize_request\n\nWe need to set ac_g_ex to notify the goal start used in\next4_mb_find_by_goal. Set ac_g_ex instead of ac_f_ex in\next4_mb_normalize_request.\nBesides we should assure goal start is in range [first_data_block,\nblocks_count) as ext4_mb_initialize_context does.\n\n[ Added a check to make sure size is less than ar-\u003epright; otherwise\n  we could end up passing an underflowed value of ar-\u003epright - size to\n  ext4_get_group_no_and_offset(), which will trigger a BUG_ON later on.\n  - TYT ]","ecosystems":[],"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":"ext4: set goal start correctly in ext4_mb_normalize_request","id":"CVE-2023-54021","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"integer_overflow","year":"2023"},"n_packages":0,"n_references":8,"next":{"headline":"ALSA: usb-audio: Fix potential memory leaks at error path for UMP open","id":"CVE-2023-54022"},"packages":[],"prev":{"headline":"dmaengine: sf-pdma: pdma_desc memory leak fix","id":"CVE-2023-54020"},"products":["Linux"],"published":"2025-12-24","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-05-11","vendors":["Linux"]},"summary":"A local attacker can trigger a kernel BUG_ON crash in the ext4 filesystem via an integer underflow, causing a denial of service.","url":"https://insights.sbomify.com/CVE-2023-54021/"}