{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-43234 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-43234 is a medium-severity denial of service vulnerability in Linux kernel, published on 6 May 2026. 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-2026-43234 and fix it if it is affected.\n\nWhat it is: CVE-2026-43234 is a medium-severity denial of service vulnerability in Linux kernel, published on 6 May 2026. 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-2026-43234 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-2026-43234/ (Markdown: https://insights.sbomify.com/CVE-2026-43234/index.md)","id":"CVE-2026-43234","markdown":"https://insights.sbomify.com/CVE-2026-43234/index.md","name":"CVE-2026-43234","record":{"aliases":["AZL-85818","BELL-CVE-2026-43234","DEBIAN-CVE-2026-43234","GHSA-fgqh-8xwq-c3jp","ROOT-OS-DEBIAN-11-CVE-2026-43234","ROOT-OS-DEBIAN-12-CVE-2026-43234","ROOT-OS-DEBIAN-13-CVE-2026-43234","ROOT-OS-UBUNTU-2204-CVE-2026-43234","ROOT-OS-UBUNTU-2404-CVE-2026-43234","UBUNTU-CVE-2026-43234"],"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 flaw in the Linux kernel team driver causes a reference count leak during slave unregistration, leading to a 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":[],"description":"In the Linux kernel, the following vulnerability has been resolved:\n\nteam: avoid NETDEV_CHANGEMTU event when unregistering slave\n\nsyzbot is reporting\n\n  unregister_netdevice: waiting for netdevsim0 to become free. Usage count = 3\n  ref_tracker: netdev@ffff88807dcf8618 has 1/2 users at\n       __netdev_tracker_alloc include/linux/netdevice.h:4400 [inline]\n       netdev_hold include/linux/netdevice.h:4429 [inline]\n       inetdev_init+0x201/0x4e0 net/ipv4/devinet.c:286\n       inetdev_event+0x251/0x1610 net/ipv4/devinet.c:1600\n       notifier_call_chain+0x19d/0x3a0 kernel/notifier.c:85\n       call_netdevice_notifiers_mtu net/core/dev.c:2318 [inline]\n       netif_set_mtu_ext+0x5aa/0x800 net/core/dev.c:9886\n       netif_set_mtu+0xd7/0x1b0 net/core/dev.c:9907\n       dev_set_mtu+0x126/0x260 net/core/dev_api.c:248\n       team_port_del+0xb07/0xcb0 drivers/net/team/team_core.c:1333\n       team_del_slave drivers/net/team/team_core.c:1936 [inline]\n       team_device_event+0x207/0x5b0 drivers/net/team/team_core.c:2929\n       notifier_call_chain+0x19d/0x3a0 kernel/notifier.c:85\n       call_netdevice_notifiers_extack net/core/dev.c:2281 [inline]\n       call_netdevice_notifiers net/core/dev.c:2295 [inline]\n       __dev_change_net_namespace+0xcb7/0x2050 net/core/dev.c:12592\n       do_setlink+0x2ce/0x4590 net/core/rtnetlink.c:3060\n       rtnl_changelink net/core/rtnetlink.c:3776 [inline]\n       __rtnl_newlink net/core/rtnetlink.c:3935 [inline]\n       rtnl_newlink+0x15a9/0x1be0 net/core/rtnetlink.c:4072\n       rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6958\n       netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550\n       netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]\n       netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344\n       netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894\n\nproblem. Ido Schimmel found steps to reproduce\n\n  ip link add name team1 type team\n  ip link add name dummy1 mtu 1499 master team1 type dummy\n  ip netns add ns1\n  ip link set dev dummy1 netns ns1\n  ip -n ns1 link del dev dummy1\n\nand also found that the same issue was fixed in the bond driver in\ncommit f51048c3e07b (\"bonding: avoid NETDEV_CHANGEMTU event when\nunregistering slave\").\n\nLet's do similar thing for the team driver, with commit ad7c7b2172c3 (\"net:\nhold netdev instance lock during sysfs operations\") and commit 303a8487a657\n(\"net: s/__dev_set_mtu/__netif_set_mtu/\") also applied.","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":"team: avoid NETDEV_CHANGEMTU event when unregistering slave","id":"CVE-2026-43234","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":5,"next":{"headline":"media: iris: Add missing platform data entries for SM8750","id":"CVE-2026-43235"},"packages":[],"prev":{"headline":"netfilter: nf_conntrack_h323: fix OOB read in decode_choice()","id":"CVE-2026-43233"},"products":["Linux"],"published":"2026-05-06","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":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-10-21","vendors":["Linux"]},"summary":"A flaw in the Linux kernel team driver causes a reference count leak during slave unregistration, leading to a denial of service.","url":"https://insights.sbomify.com/CVE-2026-43234/"}