{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-47564 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-47564 is a high-severity use after free 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-2021-47564 and fix it if it is affected.\n\nWhat it is: CVE-2021-47564 is a high-severity use after free 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-2021-47564 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-2021-47564/ (Markdown: https://insights.sbomify.com/CVE-2021-47564/index.md)","id":"CVE-2021-47564","markdown":"https://insights.sbomify.com/CVE-2021-47564/index.md","name":"CVE-2021-47564","record":{"aliases":["DEBIAN-CVE-2021-47564","UBUNTU-CVE-2021-47564"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel driver","requires_auth":"low_privilege","summary":"A double free error in the Marvell Prestera network driver causes a kernel crash, leading to denial of service.","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-415","name":"Double Free"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: marvell: prestera: fix double free issue on err path\n\nfix error path handling in prestera_bridge_port_join() that\ncases prestera driver to crash (see below).\n\n Trace:\n   Internal error: Oops: 96000044 [#1] SMP\n   Modules linked in: prestera_pci prestera uio_pdrv_genirq\n   CPU: 1 PID: 881 Comm: ip Not tainted 5.15.0 #1\n   pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n   pc : prestera_bridge_destroy+0x2c/0xb0 [prestera]\n   lr : prestera_bridge_port_join+0x2cc/0x350 [prestera]\n   sp : ffff800011a1b0f0\n   ...\n   x2 : ffff000109ca6c80 x1 : dead000000000100 x0 : dead000000000122\n    Call trace:\n   prestera_bridge_destroy+0x2c/0xb0 [prestera]\n   prestera_bridge_port_join+0x2cc/0x350 [prestera]\n   prestera_netdev_port_event.constprop.0+0x3c4/0x450 [prestera]\n   prestera_netdev_event_handler+0xf4/0x110 [prestera]\n   raw_notifier_call_chain+0x54/0x80\n   call_netdevice_notifiers_info+0x54/0xa0\n   __netdev_upper_dev_link+0x19c/0x380","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":"net: marvell: prestera: fix double free issue on err path","id":"CVE-2021-47564","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":3,"next":{"headline":"scsi: mpt3sas: Fix kernel panic during drive powercycle test","id":"CVE-2021-47565"},"packages":[],"prev":{"headline":"ice: avoid bpf_prog refcount underflow","id":"CVE-2021-47563"},"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 double free error in the Marvell Prestera network driver causes a kernel crash, leading to denial of service.","url":"https://insights.sbomify.com/CVE-2021-47564/"}