cvelist/2025/21xxx/CVE-2025-21652.json

{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2025-21652",
        "ASSIGNER": "cve@kernel.org",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "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->phy_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->netdev_ops->ndo_init() and\nreleasing it in dev->priv_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---"
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "vendor_name": "Linux",
                    "product": {
                        "product_data": [
                            {
                                "product_name": "Linux",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "8c55facecd7ade835287298ce325f930d888d8ec",
                                            "version_value": "ba9f7c16ec879c83bb4f80406773a911aace8267"
                                        },
                                        {
                                            "version_value": "not down converted",
                                            "x_cve_json_5_version_data": {
                                                "versions": [
                                                    {
                                                        "version": "6.2",
                                                        "status": "affected"
                                                    },
                                                    {
                                                        "version": "0",
                                                        "lessThan": "6.2",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.6.72",
                                                        "lessThanOrEqual": "6.6.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.12.10",
                                                        "lessThanOrEqual": "6.12.*",
                                                        "status": "unaffected",
                                                        "versionType": "semver"
                                                    },
                                                    {
                                                        "version": "6.13-rc7",
                                                        "lessThanOrEqual": "*",
                                                        "status": "unaffected",
                                                        "versionType": "original_commit_for_fix"
                                                    }
                                                ],
                                                "defaultStatus": "affected"
                                            }
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://git.kernel.org/stable/c/ba9f7c16ec879c83bb4f80406773a911aace8267",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/ba9f7c16ec879c83bb4f80406773a911aace8267"
            },
            {
                "url": "https://git.kernel.org/stable/c/52a24538d569f48e79d1a169a5d359d384152950",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/52a24538d569f48e79d1a169a5d359d384152950"
            },
            {
                "url": "https://git.kernel.org/stable/c/cb358ff94154774d031159b018adf45e17673941",
                "refsource": "MISC",
                "name": "https://git.kernel.org/stable/c/cb358ff94154774d031159b018adf45e17673941"
            }
        ]
    },
    "generator": {
        "engine": "bippy-5f407fcff5a0"
    }
}