{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-47587 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-47587 is a critical vulnerability in Linux kernel, published on 19 Jun 2024. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-47587 and fix it if it is affected.\n\nWhat it is: CVE-2021-47587 is a critical vulnerability in Linux kernel, published on 19 Jun 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-47587 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-2021-47587/ (Markdown: https://insights.sbomify.com/CVE-2021-47587/index.md)","id":"CVE-2021-47587","markdown":"https://insights.sbomify.com/CVE-2021-47587/index.md","name":"CVE-2021-47587","record":{"aliases":["DEBIAN-CVE-2021-47587","GHSA-gp83-h9gh-vrv6","UBUNTU-CVE-2021-47587"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["data_modify","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Linux kernel driver","requires_auth":"none","summary":"A race condition in the Linux kernel SYSTEMPORT driver allows concurrent transmit queues to corrupt network descriptors, potentially causing data corruption or denial of service.","user_interaction":"not_required","vuln_class":"race_condition"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":9.8,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-667","name":"Improper Locking"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: systemport: Add global locking for descriptor lifecycle\n\nThe descriptor list is a shared resource across all of the transmit queues, and\nthe locking mechanism used today only protects concurrency across a given\ntransmit queue between the transmit and reclaiming. This creates an opportunity\nfor the SYSTEMPORT hardware to work on corrupted descriptors if we have\nmultiple producers at once which is the case when using multiple transmit\nqueues.\n\nThis was particularly noticeable when using multiple flows/transmit queues and\nit showed up in interesting ways in that UDP packets would get a correct UDP\nheader checksum being calculated over an incorrect packet length. Similarly TCP\npackets would get an equally correct checksum computed by the hardware over an\nincorrect packet length.\n\nThe SYSTEMPORT hardware maintains an internal descriptor list that it re-arranges\nwhen the driver produces a new descriptor anytime it writes to the\nWRITE_PORT_{HI,LO} registers, there is however some delay in the hardware to\nre-organize its descriptors and it is possible that concurrent TX queues\neventually break this internal allocation scheme to the point where the\nlength/status part of the descriptor gets used for an incorrect data buffer.\n\nThe fix is to impose a global serialization for all TX queues in the short\nsection where we are writing to the WRITE_PORT_{HI,LO} registers which solves\nthe corruption even with multiple concurrent TX queues being used.","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: systemport: Add global locking for descriptor lifecycle","id":"CVE-2021-47587","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"race_condition","year":"2021"},"n_packages":0,"n_references":8,"next":{"headline":"sit: do not call ipip6_dev_free() from sit_init_net()","id":"CVE-2021-47588"},"packages":[],"prev":{"headline":"net: stmmac: dwmac-rk: fix oob read in rk_gmac_setup","id":"CVE-2021-47586"},"products":["Linux"],"published":"2024-06-19","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":"2026-08-05","vendors":["Linux"]},"summary":"A race condition in the Linux kernel SYSTEMPORT driver allows concurrent transmit queues to corrupt network descriptors, potentially causing data corruption or denial of service.","url":"https://insights.sbomify.com/CVE-2021-47587/"}