{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-47117 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-47117 is a medium-severity denial of service vulnerability in Linux kernel, published on 15 Mar 2024. 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-2021-47117 and fix it if it is affected.\n\nWhat it is: CVE-2021-47117 is a medium-severity denial of service vulnerability in Linux kernel, published on 15 Mar 2024. 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-2021-47117 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-2021-47117/ (Markdown: https://insights.sbomify.com/CVE-2021-47117/index.md)","id":"CVE-2021-47117","markdown":"https://insights.sbomify.com/CVE-2021-47117/index.md","name":"CVE-2021-47117","record":{"aliases":["DEBIAN-CVE-2021-47117","GHSA-2cqh-cfpq-83ph","UBUNTU-CVE-2021-47117"],"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 in the ext4 filesystem, causing a system crash and denial of service.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":5.5,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix bug on in ext4_es_cache_extent as ext4_split_extent_at failed\n\nWe got follow bug_on when run fsstress with injecting IO fault:\n[130747.323114] kernel BUG at fs/ext4/extents_status.c:762!\n[130747.323117] Internal error: Oops - BUG: 0 [#1] SMP\n......\n[130747.334329] Call trace:\n[130747.334553]  ext4_es_cache_extent+0x150/0x168 [ext4]\n[130747.334975]  ext4_cache_extents+0x64/0xe8 [ext4]\n[130747.335368]  ext4_find_extent+0x300/0x330 [ext4]\n[130747.335759]  ext4_ext_map_blocks+0x74/0x1178 [ext4]\n[130747.336179]  ext4_map_blocks+0x2f4/0x5f0 [ext4]\n[130747.336567]  ext4_mpage_readpages+0x4a8/0x7a8 [ext4]\n[130747.336995]  ext4_readpage+0x54/0x100 [ext4]\n[130747.337359]  generic_file_buffered_read+0x410/0xae8\n[130747.337767]  generic_file_read_iter+0x114/0x190\n[130747.338152]  ext4_file_read_iter+0x5c/0x140 [ext4]\n[130747.338556]  __vfs_read+0x11c/0x188\n[130747.338851]  vfs_read+0x94/0x150\n[130747.339110]  ksys_read+0x74/0xf0\n\nThis patch's modification is according to Jan Kara's suggestion in:\nhttps://patchwork.ozlabs.org/project/linux-ext4/patch/20210428085158.3728201-1-yebin10@huawei.com/\n\"I see. Now I understand your patch. Honestly, seeing how fragile is trying\nto fix extent tree after split has failed in the middle, I would probably\ngo even further and make sure we fix the tree properly in case of ENOSPC\nand EDQUOT (those are easily user triggerable).  Anything else indicates a\nHW problem or fs corruption so I'd rather leave the extent tree as is and\ndon't try to fix it (which also means we will not create overlapping\nextents).\"","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: fix bug on in ext4_es_cache_extent as ext4_split_extent_at failed","id":"CVE-2021-47117","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"denial_of_service","year":"2021"},"n_packages":0,"n_references":8,"next":{"headline":"pid: take a reference when initializing `cad_pid`","id":"CVE-2021-47118"},"packages":[],"prev":{"headline":"ext4: fix memory leak in ext4_mb_init_backend on error path.","id":"CVE-2021-47116"},"products":["Linux"],"published":"2024-03-15","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":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-05-11","vendors":["Linux"]},"summary":"A local attacker can trigger a kernel bug in the ext4 filesystem, causing a system crash and denial of service.","url":"https://insights.sbomify.com/CVE-2021-47117/"}