{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-47026 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-47026 is a high-severity use after free vulnerability in Linux kernel, published on 28 Feb 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-2021-47026 and fix it if it is affected.\n\nWhat it is: CVE-2021-47026 is a high-severity use after free vulnerability in Linux kernel, published on 28 Feb 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-2021-47026 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-2021-47026/ (Markdown: https://insights.sbomify.com/CVE-2021-47026/index.md)","id":"CVE-2021-47026","markdown":"https://insights.sbomify.com/CVE-2021-47026/index.md","name":"CVE-2021-47026","record":{"aliases":["DEBIAN-CVE-2021-47026","GHSA-h6m9-gq43-hhq2","UBUNTU-CVE-2021-47026"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["code_execution","denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel RDMA","requires_auth":"low_privilege","summary":"A use-after-free vulnerability in the Linux kernel RDMA client allows attackers to cause denial of service or execute code via race conditions during session removal.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"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":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rtrs-clt: destroy sysfs after removing session from active list\n\nA session can be removed dynamically by sysfs interface \"remove_path\" that\neventually calls rtrs_clt_remove_path_from_sysfs function.  The current\nrtrs_clt_remove_path_from_sysfs first removes the sysfs interfaces and\nfrees sess-\u003estats object. Second it removes the session from the active\nlist.\n\nTherefore some functions could access non-connected session and access the\nfreed sess-\u003estats object even-if they check the session status before\naccessing the session.\n\nFor instance rtrs_clt_request and get_next_path_min_inflight check the\nsession status and try to send IO to the session.  The session status\ncould be changed when they are trying to send IO but they could not catch\nthe change and update the statistics information in sess-\u003estats object,\nand generate use-after-free problem.\n(see: \"RDMA/rtrs-clt: Check state of the rtrs_clt_sess before reading its\nstats\")\n\nThis patch changes the rtrs_clt_remove_path_from_sysfs to remove the\nsession from the active session list and then destroy the sysfs\ninterfaces.\n\nEach function still should check the session status because closing or\nerror recovery paths can change the status.","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":"RDMA/rtrs-clt: destroy sysfs after removing session from active list","id":"CVE-2021-47026","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"use_after_free","year":"2021"},"n_packages":0,"n_references":4,"next":{"headline":"mt76: mt7921: fix kernel crash when the firmware fails to download","id":"CVE-2021-47027"},"packages":[],"prev":{"headline":"iommu/mediatek: Always enable the clk on resume","id":"CVE-2021-47025"},"products":["Linux"],"published":"2024-02-28","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)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-05-11","vendors":["Linux"]},"summary":"A use-after-free vulnerability in the Linux kernel RDMA client allows attackers to cause denial of service or execute code via race conditions during session removal.","url":"https://insights.sbomify.com/CVE-2021-47026/"}