CVE-2025-21652

{"id": "CVE-2025-21652", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}, {"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "published": "2025-01-19T11:15:10.830", "references": [{"url": "https://git.kernel.org/stable/c/52a24538d569f48e79d1a169a5d359d384152950", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ba9f7c16ec879c83bb4f80406773a911aace8267", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/cb358ff94154774d031159b018adf45e17673941", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-416"}]}, {"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-416"}]}], "descriptions": [{"lang": "en", "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---"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ipvlan: Se ha corregido el error use-after-free en ipvlan_get_iflink(). syzbot present\u00f3 un informe de error use-after-free [0] sobre ipvlan y linkwatch. ipvlan no contiene un refcnt del dispositivo inferior a diferencia de vlan y macvlan. Si se activa el trabajo de linkwatch para el dispositivo ipvlan dev, es posible que el dispositivo inferior ya se haya liberado, lo que da como resultado un UAF de ipvlan->phy_dev en ipvlan_get_iflink(). Podemos retrasar la anulaci\u00f3n del registro del dispositivo inferior como vlan y macvlan al retener el refcnt del dispositivo inferior en dev->netdev_ops->ndo_init() y liberarlo en dev->priv_destructor(). Jakub se\u00f1al\u00f3 que llamar a .ndo_XXX despu\u00e9s de que unregister_netdevice() haya regresado es propenso a errores y sugiri\u00f3 [1] abordar este UAF en el n\u00facleo llevando m\u00e1s all\u00e1 el commit 750e51603395 (\"net: evitar un UAF potencial en default_operstate()\"). Supongamos que se cancela el registro de dispositivos y usemos la protecci\u00f3n RCU en default_operstate() para no competir con la cancelaci\u00f3n del registro del dispositivo. [0]: ERROR: KASAN: slab-use-after-free in ipvlan_get_iflink+0x84/0x88 drivers/net/ipvlan/ipvlan_main.c:353 Read of size 4 at addr ffff0000d768c0e0 by task kworker/u8:35/6944 CPU: 0 UID: 0 PID: 6944 Comm: kworker/u8:35 Not tainted 6.13.0-rc2-g9bc5c9515b48 #12 4c3cb9e8b4565456f6a355f312ff91f4f29b3c47 Hardware name: linux,dummy-virt (DT) Workqueue: events_unbound linkwatch_event Call trace: show_stack+0x38/0x50 arch/arm64/kernel/stacktrace.c:484 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xbc/0x108 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x16c/0x6f0 mm/kasan/report.c:489 kasan_report+0xc0/0x120 mm/kasan/report.c:602 __asan_report_load4_noabort+0x20/0x30 mm/kasan/report_generic.c:380 ipvlan_get_iflink+0x84/0x88 drivers/net/ipvlan/ipvlan_main.c:353 dev_get_iflink+0x7c/0xd8 net/core/dev.c:674 default_operstate net/core/link_watch.c:45 [inline] rfc2863_policy+0x144/0x360 net/core/link_watch.c:72 linkwatch_do_dev+0x60/0x228 net/core/link_watch.c:175 __linkwatch_run_queue+0x2f4/0x5b8 net/core/link_watch.c:239 linkwatch_event+0x64/0xa8 net/core/link_watch.c:282 process_one_work+0x700/0x1398 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x8c4/0xe10 kernel/workqueue.c:3391 kthread+0x2b0/0x360 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 Allocated by task 9303: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x30/0x68 mm/kasan/common.c:68 kasan_save_alloc_info+0x44/0x58 mm/kasan/generic.c:568 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x84/0xa0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4283 [inline] __kmalloc_node_noprof+0x2a0/0x560 mm/slub.c:4289 __kvmalloc_node_noprof+0x9c/0x230 mm/util.c:650 alloc_netdev_mqs+0xb4/0x1118 net/core/dev.c:11209 rtnl_create_link+0x2b8/0xb60 net/core/rtnetlink.c:3595 rtnl_newlink_create+0x19c/0x868 net/core/rtnetlink.c:3771 __rtnl_newlink net/core/rtnetlink.c:3896 [inline] rtnl_newlink+0x122c/0x15c0 net/core/rtnetlink.c:4011 rtnetlink_rcv_msg+0x61c/0x918 net/core/rtnetlink.c:6901 netlink_rcv_skb+0x1dc/0x398 net/netlink/af_netlink.c:2542 rtnetlink_rcv+0x34/0x50 net/core/rtnetlink.c:6928 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline] netlink_unicast+0x618/0x838 net/netlink/af_netlink.c:1347 netlink_sendmsg+0x5fc/0x8b0 net/netlink/af_netlink.c:1891 sock_sendmsg_nosec net/socket.c:711 [inline] __sock_sendmsg net/socket.c:726 [inline] __sys_sendto+0x2ec/0x438 net/socket.c:2197 __do_sys_sendto net/socket.c:2204 [inline] __se_sys_sendto net/socket.c:2200 [inline] __arm64_sys_sendto+0xe4/0x110 net/socket.c:2200 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x90/0x278 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x13c/0x250 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x54/0x---truncado---"}], "lastModified": "2025-02-10T18:15:34.883", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "33E12097-C88A-45B4-9677-2A961A08DD3E", "versionEndExcluding": "6.6.72", "versionStartIncluding": "6.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "02D604F6-10D1-4F7B-A022-0888406A1121", "versionEndExcluding": "6.12.10", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "62567B3C-6CEE-46D0-BC2E-B3717FBF7D13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5A073481-106D-4B15-B4C7-FB0213B8E1D4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DE491969-75AE-4A6B-9A58-8FC5AF98798F"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "93C0660D-7FB8-4FBA-892A-B064BA71E49E"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "034C36A6-C481-41F3-AE9A-D116E5BE6895"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc6:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8AF9DC49-2085-4FFB-A7E3-73DFAFECC7F2"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}