{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-47250 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-47250 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-2021-47250 and fix it if it is affected.\n\nWhat it is: CVE-2021-47250 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-2021-47250 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-2021-47250/ (Markdown: https://insights.sbomify.com/CVE-2021-47250/index.md)","id":"CVE-2021-47250","markdown":"https://insights.sbomify.com/CVE-2021-47250/index.md","name":"CVE-2021-47250","record":{"aliases":["DEBIAN-CVE-2021-47250","GHSA-wr5g-85mp-25c9","UBUNTU-CVE-2021-47250"],"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 memory leak in the Linux kernel's CIPSOv4 handling allows attackers to exhaust system memory, causing 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\nnet: ipv4: fix memory leak in netlbl_cipsov4_add_std\n\nReported by syzkaller:\nBUG: memory leak\nunreferenced object 0xffff888105df7000 (size 64):\ncomm \"syz-executor842\", pid 360, jiffies 4294824824 (age 22.546s)\nhex dump (first 32 bytes):\n00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\nbacktrace:\n[\u003c00000000e67ed558\u003e] kmalloc include/linux/slab.h:590 [inline]\n[\u003c00000000e67ed558\u003e] kzalloc include/linux/slab.h:720 [inline]\n[\u003c00000000e67ed558\u003e] netlbl_cipsov4_add_std net/netlabel/netlabel_cipso_v4.c:145 [inline]\n[\u003c00000000e67ed558\u003e] netlbl_cipsov4_add+0x390/0x2340 net/netlabel/netlabel_cipso_v4.c:416\n[\u003c0000000006040154\u003e] genl_family_rcv_msg_doit.isra.0+0x20e/0x320 net/netlink/genetlink.c:739\n[\u003c00000000204d7a1c\u003e] genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]\n[\u003c00000000204d7a1c\u003e] genl_rcv_msg+0x2bf/0x4f0 net/netlink/genetlink.c:800\n[\u003c00000000c0d6a995\u003e] netlink_rcv_skb+0x134/0x3d0 net/netlink/af_netlink.c:2504\n[\u003c00000000d78b9d2c\u003e] genl_rcv+0x24/0x40 net/netlink/genetlink.c:811\n[\u003c000000009733081b\u003e] netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]\n[\u003c000000009733081b\u003e] netlink_unicast+0x4a0/0x6a0 net/netlink/af_netlink.c:1340\n[\u003c00000000d5fd43b8\u003e] netlink_sendmsg+0x789/0xc70 net/netlink/af_netlink.c:1929\n[\u003c000000000a2d1e40\u003e] sock_sendmsg_nosec net/socket.c:654 [inline]\n[\u003c000000000a2d1e40\u003e] sock_sendmsg+0x139/0x170 net/socket.c:674\n[\u003c00000000321d1969\u003e] ____sys_sendmsg+0x658/0x7d0 net/socket.c:2350\n[\u003c00000000964e16bc\u003e] ___sys_sendmsg+0xf8/0x170 net/socket.c:2404\n[\u003c000000001615e288\u003e] __sys_sendmsg+0xd3/0x190 net/socket.c:2433\n[\u003c000000004ee8b6a5\u003e] do_syscall_64+0x37/0x90 arch/x86/entry/common.c:47\n[\u003c00000000171c7cee\u003e] entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nThe memory of doi_def-\u003emap.std pointing is allocated in\nnetlbl_cipsov4_add_std, but no place has freed it. It should be\nfreed in cipso_v4_doi_free which frees the cipso DOI resource.","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: ipv4: fix memory leak in netlbl_cipsov4_add_std","id":"CVE-2021-47250","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":8,"next":{"headline":"mac80211: fix skb length check in ieee80211_scan_rx()","id":"CVE-2021-47251"},"packages":[],"prev":{"headline":"net: rds: fix memory leak in rds_recvmsg","id":"CVE-2021-47249"},"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":"2026-05-11","vendors":["Linux"]},"summary":"A memory leak in the Linux kernel's CIPSOv4 handling allows attackers to exhaust system memory, causing denial of service.","url":"https://insights.sbomify.com/CVE-2021-47250/"}