{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2025-21652 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2025-21652 is a high-severity use after free vulnerability in Linux kernel, published on 19 Jan 2025. 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-2025-21652 and fix it if it is affected.\n\nWhat it is: CVE-2025-21652 is a high-severity use after free vulnerability in Linux kernel, published on 19 Jan 2025. 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-2025-21652 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-2025-21652/ (Markdown: https://insights.sbomify.com/CVE-2025-21652/index.md)","id":"CVE-2025-21652","markdown":"https://insights.sbomify.com/CVE-2025-21652/index.md","name":"CVE-2025-21652","record":{"aliases":["AZL-56324","BELL-CVE-2025-21652","DEBIAN-CVE-2025-21652","GHSA-p277-wqpc-75vw","UBUNTU-CVE-2025-21652"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service","code_execution"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A use-after-free vulnerability in the Linux kernel's ipvlan driver allows attackers to cause a denial of service or potentially execute code.","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":"cna","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-416","name":"Use After Free"}],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipvlan: Fix use-after-free in ipvlan_get_iflink().\n\nsyzbot presented an use-after-free report [0] regarding ipvlan and\nlinkwatch.\n\nipvlan does not hold a refcnt of the lower device unlike vlan and\nmacvlan.\n\nIf the linkwatch work is triggered for the ipvlan dev, the lower dev\nmight have already been freed, resulting in UAF of ipvlan-\u003ephy_dev in\nipvlan_get_iflink().\n\nWe can delay the lower dev unregistration like vlan and macvlan by\nholding the lower dev's refcnt in dev-\u003enetdev_ops-\u003endo_init() and\nreleasing it in dev-\u003epriv_destructor().\n\nJakub pointed out calling .ndo_XXX after unregister_netdevice() has\nreturned is error prone and suggested [1] addressing this UAF in the\ncore by taking commit 750e51603395 (\"net: avoid potential UAF in\ndefault_operstate()\") further.\n\nLet's assume unregistering devices DOWN and use RCU protection in\ndefault_operstate() not to race with the device unregistration.\n\n[0]:\nBUG: KASAN: slab-use-after-free in ipvlan_get_iflink+0x84/0x88 drivers/net/ipvlan/ipvlan_main.c:353\nRead of size 4 at addr ffff0000d768c0e0 by task kworker/u8:35/6944\n\nCPU: 0 UID: 0 PID: 6944 Comm: kworker/u8:35 Not tainted 6.13.0-rc2-g9bc5c9515b48 #12 4c3cb9e8b4565456f6a355f312ff91f4f29b3c47\nHardware name: linux,dummy-virt (DT)\nWorkqueue: events_unbound linkwatch_event\nCall trace:\n show_stack+0x38/0x50 arch/arm64/kernel/stacktrace.c:484 (C)\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0xbc/0x108 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0x16c/0x6f0 mm/kasan/report.c:489\n kasan_report+0xc0/0x120 mm/kasan/report.c:602\n __asan_report_load4_noabort+0x20/0x30 mm/kasan/report_generic.c:380\n ipvlan_get_iflink+0x84/0x88 drivers/net/ipvlan/ipvlan_main.c:353\n dev_get_iflink+0x7c/0xd8 net/core/dev.c:674\n default_operstate net/core/link_watch.c:45 [inline]\n rfc2863_policy+0x144/0x360 net/core/link_watch.c:72\n linkwatch_do_dev+0x60/0x228 net/core/link_watch.c:175\n __linkwatch_run_queue+0x2f4/0x5b8 net/core/link_watch.c:239\n linkwatch_event+0x64/0xa8 net/core/link_watch.c:282\n process_one_work+0x700/0x1398 kernel/workqueue.c:3229\n process_scheduled_works kernel/workqueue.c:3310 [inline]\n worker_thread+0x8c4/0xe10 kernel/workqueue.c:3391\n kthread+0x2b0/0x360 kernel/kthread.c:389\n ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862\n\nAllocated by task 9303:\n kasan_save_stack mm/kasan/common.c:47 [inline]\n kasan_save_track+0x30/0x68 mm/kasan/common.c:68\n kasan_save_alloc_info+0x44/0x58 mm/kasan/generic.c:568\n poison_kmalloc_redzone mm/kasan/common.c:377 [inline]\n __kasan_kmalloc+0x84/0xa0 mm/kasan/common.c:394\n kasan_kmalloc include/linux/kasan.h:260 [inline]\n __do_kmalloc_node mm/slub.c:4283 [inline]\n __kmalloc_node_noprof+0x2a0/0x560 mm/slub.c:4289\n __kvmalloc_node_noprof+0x9c/0x230 mm/util.c:650\n alloc_netdev_mqs+0xb4/0x1118 net/core/dev.c:11209\n rtnl_create_link+0x2b8/0xb60 net/core/rtnetlink.c:3595\n rtnl_newlink_create+0x19c/0x868 net/core/rtnetlink.c:3771\n __rtnl_newlink net/core/rtnetlink.c:3896 [inline]\n rtnl_newlink+0x122c/0x15c0 net/core/rtnetlink.c:4011\n rtnetlink_rcv_msg+0x61c/0x918 net/core/rtnetlink.c:6901\n netlink_rcv_skb+0x1dc/0x398 net/netlink/af_netlink.c:2542\n rtnetlink_rcv+0x34/0x50 net/core/rtnetlink.c:6928\n netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline]\n netlink_unicast+0x618/0x838 net/netlink/af_netlink.c:1347\n netlink_sendmsg+0x5fc/0x8b0 net/netlink/af_netlink.c:1891\n sock_sendmsg_nosec net/socket.c:711 [inline]\n __sock_sendmsg net/socket.c:726 [inline]\n __sys_sendto+0x2ec/0x438 net/socket.c:2197\n __do_sys_sendto net/socket.c:2204 [inline]\n __se_sys_sendto net/socket.c:2200 [inline]\n __arm64_sys_sendto+0xe4/0x110 net/socket.c:2200\n __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]\n invoke_syscall+0x90/0x278 arch/arm64/kernel/syscall.c:49\n el0_svc_common+0x13c/0x250 arch/arm64/kernel/syscall.c:132\n do_el0_svc+0x54/0x70 arch/arm64/kernel/syscall.c:151\n el\n---truncated---","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":"ipvlan: Fix use-after-free in ipvlan_get_iflink().","id":"CVE-2025-21652","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"use_after_free","year":"2025"},"n_packages":0,"n_references":3,"next":{"headline":"net_sched: cls_flow: validate TCA_FLOW_RSHIFT attribute","id":"CVE-2025-21653"},"packages":[],"prev":{"headline":"net: hns3: don't auto enable misc vector","id":"CVE-2025-21651"},"products":["Linux"],"published":"2025-01-19","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":"total"},"state":"PUBLISHED","updated":"2026-08-05","vendors":["Linux"]},"summary":"A use-after-free vulnerability in the Linux kernel's ipvlan driver allows attackers to cause a denial of service or potentially execute code.","url":"https://insights.sbomify.com/CVE-2025-21652/"}