{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-47554 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-47554 is a medium-severity vulnerability in Linux kernel, published on 24 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-2021-47554 and fix it if it is affected.\n\nWhat it is: CVE-2021-47554 is a medium-severity vulnerability in Linux kernel, published on 24 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-2021-47554 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-2021-47554/ (Markdown: https://insights.sbomify.com/CVE-2021-47554/index.md)","id":"CVE-2021-47554","markdown":"https://insights.sbomify.com/CVE-2021-47554/index.md","name":"CVE-2021-47554","record":{"aliases":["DEBIAN-CVE-2021-47554","UBUNTU-CVE-2021-47554"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A null pointer dereference in the Linux kernel's vdpa_sim module can cause a system crash when an error occurs during device creation.","user_interaction":"not_required","vuln_class":"null_dereference"},"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-908","name":"Use of Uninitialized Resource"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvdpa_sim: avoid putting an uninitialized iova_domain\n\nThe system will crash if we put an uninitialized iova_domain, this\ncould happen when an error occurs before initializing the iova_domain\nin vdpasim_create().\n\nBUG: kernel NULL pointer dereference, address: 0000000000000000\n...\nRIP: 0010:__cpuhp_state_remove_instance+0x96/0x1c0\n...\nCall Trace:\n \u003cTASK\u003e\n put_iova_domain+0x29/0x220\n vdpasim_free+0xd1/0x120 [vdpa_sim]\n vdpa_release_dev+0x21/0x40 [vdpa]\n device_release+0x33/0x90\n kobject_release+0x63/0x160\n vdpasim_create+0x127/0x2a0 [vdpa_sim]\n vdpasim_net_dev_add+0x7d/0xfe [vdpa_sim_net]\n vdpa_nl_cmd_dev_add_set_doit+0xe1/0x1a0 [vdpa]\n genl_family_rcv_msg_doit+0x112/0x140\n genl_rcv_msg+0xdf/0x1d0\n ...\n\nSo we must make sure the iova_domain is already initialized before\nput it.\n\nIn addition, we may get the following warning in this case:\nWARNING: ... drivers/iommu/iova.c:344 iova_cache_put+0x58/0x70\n\nSo we must make sure the iova_cache_put() is invoked only if the\niova_cache_get() is already invoked. Let's fix it together.","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":"vdpa_sim: avoid putting an uninitialized iova_domain","id":"CVE-2021-47554","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"null_dereference","year":"2021"},"n_packages":0,"n_references":2,"next":{"headline":"net: vlan: fix underflow for the real_dev refcnt","id":"CVE-2021-47555"},"packages":[],"prev":{"headline":"sched/scs: Reset task stack state in bringup_cpu()","id":"CVE-2021-47553"},"products":["Linux"],"published":"2024-05-24","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 null pointer dereference in the Linux kernel's vdpa_sim module can cause a system crash when an error occurs during device creation.","url":"https://insights.sbomify.com/CVE-2021-47554/"}