{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-47392 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-47392 is a medium-severity denial of service vulnerability in Linux kernel, published on 21 May 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-2021-47392 and fix it if it is affected.\n\nWhat it is: CVE-2021-47392 is a medium-severity denial of service vulnerability in Linux kernel, published on 21 May 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-2021-47392 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-2021-47392/ (Markdown: https://insights.sbomify.com/CVE-2021-47392/index.md)","id":"CVE-2021-47392","markdown":"https://insights.sbomify.com/CVE-2021-47392/index.md","name":"CVE-2021-47392","record":{"aliases":["DEBIAN-CVE-2021-47392","GHSA-3vpw-pw66-4mjh","UBUNTU-CVE-2021-47392"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel RDMA","requires_auth":"low_privilege","summary":"A local attacker can trigger a deadlock in the Linux kernel RDMA subsystem by causing a listener failure, leading to a 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":[{"id":"CWE-401","name":"Missing Release of Memory after Effective Lifetime"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/cma: Fix listener leak in rdma_cma_listen_on_all() failure\n\nIf cma_listen_on_all() fails it leaves the per-device ID still on the\nlisten_list but the state is not set to RDMA_CM_ADDR_BOUND.\n\nWhen the cmid is eventually destroyed cma_cancel_listens() is not called\ndue to the wrong state, however the per-device IDs are still holding the\nrefcount preventing the ID from being destroyed, thus deadlocking:\n\n task:rping state:D stack:   0 pid:19605 ppid: 47036 flags:0x00000084\n Call Trace:\n  __schedule+0x29a/0x780\n  ? free_unref_page_commit+0x9b/0x110\n  schedule+0x3c/0xa0\n  schedule_timeout+0x215/0x2b0\n  ? __flush_work+0x19e/0x1e0\n  wait_for_completion+0x8d/0xf0\n  _destroy_id+0x144/0x210 [rdma_cm]\n  ucma_close_id+0x2b/0x40 [rdma_ucm]\n  __destroy_id+0x93/0x2c0 [rdma_ucm]\n  ? __xa_erase+0x4a/0xa0\n  ucma_destroy_id+0x9a/0x120 [rdma_ucm]\n  ucma_write+0xb8/0x130 [rdma_ucm]\n  vfs_write+0xb4/0x250\n  ksys_write+0xb5/0xd0\n  ? syscall_trace_enter.isra.19+0x123/0x190\n  do_syscall_64+0x33/0x40\n  entry_SYSCALL_64_after_hwframe+0x44/0xa9\n\nEnsure that cma_listen_on_all() atomically unwinds its action under the\nlock during error.","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/cma: Fix listener leak in rdma_cma_listen_on_all() failure","id":"CVE-2021-47392","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":3,"next":{"headline":"hwmon: (mlxreg-fan) Return non-zero value when fan current state is enforced from sysfs","id":"CVE-2021-47393"},"packages":[],"prev":{"headline":"RDMA/cma: Ensure rdma_addr_cancel() happens before issuing more requests","id":"CVE-2021-47391"},"products":["Linux"],"published":"2024-05-21","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":"2026-05-23","vendors":["Linux"]},"summary":"A local attacker can trigger a deadlock in the Linux kernel RDMA subsystem by causing a listener failure, leading to a denial of service.","url":"https://insights.sbomify.com/CVE-2021-47392/"}