CVE-2025-21652 (GCVE-0-2025-21652)

Vulnerability from cvelistv5 – Published: 2025-01-19 10:18 – Updated: 2025-05-04 07:18
VLAI?
Title
ipvlan: Fix use-after-free in ipvlan_get_iflink().
Summary
In the Linux kernel, the following vulnerability has been resolved: ipvlan: Fix use-after-free in ipvlan_get_iflink(). syzbot presented an use-after-free report [0] regarding ipvlan and linkwatch. ipvlan does not hold a refcnt of the lower device unlike vlan and macvlan. If the linkwatch work is triggered for the ipvlan dev, the lower dev might have already been freed, resulting in UAF of ipvlan->phy_dev in ipvlan_get_iflink(). We can delay the lower dev unregistration like vlan and macvlan by holding the lower dev's refcnt in dev->netdev_ops->ndo_init() and releasing it in dev->priv_destructor(). Jakub pointed out calling .ndo_XXX after unregister_netdevice() has returned is error prone and suggested [1] addressing this UAF in the core by taking commit 750e51603395 ("net: avoid potential UAF in default_operstate()") further. Let's assume unregistering devices DOWN and use RCU protection in default_operstate() not to race with the device unregistration. [0]: BUG: 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+0x54/0x70 arch/arm64/kernel/syscall.c:151 el ---truncated---
Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8c55facecd7ade835287298ce325f930d888d8ec , < ba9f7c16ec879c83bb4f80406773a911aace8267 (git)
Affected: 8c55facecd7ade835287298ce325f930d888d8ec , < 52a24538d569f48e79d1a169a5d359d384152950 (git)
Affected: 8c55facecd7ade835287298ce325f930d888d8ec , < cb358ff94154774d031159b018adf45e17673941 (git)
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    Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 6.6.72 , ≤ 6.6.* (semver)
Unaffected: 6.12.10 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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    "dateUpdated": "2025-05-04T07:18:16.995Z",
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\"https://git.kernel.org/stable/c/cb358ff94154774d031159b018adf45e17673941\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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-\u003ephy_dev in\\nipvlan_get_iflink().\\n\\nWe can delay the lower dev unregistration like vlan and macvlan by\\nholding the lower dev\u0027s 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\u0027s 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---\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.72\", \"versionStartIncluding\": \"6.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.10\", \"versionStartIncluding\": \"6.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13\", \"versionStartIncluding\": \"6.2\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:18:16.995Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-21652\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:18:16.995Z\", \"dateReserved\": \"2024-12-29T08:45:45.729Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-01-19T10:18:09.570Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.