FKIE_CVE-2025-40164

Vulnerability from fkie_nvd - Published: 2025-11-12 11:15 - Updated: 2026-02-26 15:52
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: usbnet: Fix using smp_processor_id() in preemptible code warnings Syzbot reported the following warning: BUG: using smp_processor_id() in preemptible [00000000] code: dhcpcd/2879 caller is usbnet_skb_return+0x74/0x490 drivers/net/usb/usbnet.c:331 CPU: 1 UID: 0 PID: 2879 Comm: dhcpcd Not tainted 6.15.0-rc4-syzkaller-00098-g615dca38c2ea #0 PREEMPT(voluntary) Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120 check_preemption_disabled+0xd0/0xe0 lib/smp_processor_id.c:49 usbnet_skb_return+0x74/0x490 drivers/net/usb/usbnet.c:331 usbnet_resume_rx+0x4b/0x170 drivers/net/usb/usbnet.c:708 usbnet_change_mtu+0x1be/0x220 drivers/net/usb/usbnet.c:417 __dev_set_mtu net/core/dev.c:9443 [inline] netif_set_mtu_ext+0x369/0x5c0 net/core/dev.c:9496 netif_set_mtu+0xb0/0x160 net/core/dev.c:9520 dev_set_mtu+0xae/0x170 net/core/dev_api.c:247 dev_ifsioc+0xa31/0x18d0 net/core/dev_ioctl.c:572 dev_ioctl+0x223/0x10e0 net/core/dev_ioctl.c:821 sock_do_ioctl+0x19d/0x280 net/socket.c:1204 sock_ioctl+0x42f/0x6a0 net/socket.c:1311 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f For historical and portability reasons, the netif_rx() is usually run in the softirq or interrupt context, this commit therefore add local_bh_disable/enable() protection in the usbnet_resume_rx().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0134c7bff14bd50314a4f92b182850ddfc38e255Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/17fbad93879e87a334062882b45fa727ba1b3dd7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/327cd4b68b4398b6c24f10eb2b2533ffbfc10185Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/65d04291adf7c59338f87aab9c6fe0bfa9993e64Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d1944bab8e0c1511f0cbf364aa06547735bb0ddbPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f45fffae5e2549bd0a4670cc52a15ad54c9f121ePatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 4.7
linux linux_kernel 4.7
linux linux_kernel 6.18
To clipboard 

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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusbnet: Fix using smp_processor_id() in preemptible code warnings\n\nSyzbot reported the following warning:\n\nBUG: using smp_processor_id() in preemptible [00000000] code: dhcpcd/2879\ncaller is usbnet_skb_return+0x74/0x490 drivers/net/usb/usbnet.c:331\nCPU: 1 UID: 0 PID: 2879 Comm: dhcpcd Not tainted 6.15.0-rc4-syzkaller-00098-g615dca38c2ea #0 PREEMPT(voluntary)\nCall Trace:\n \u003cTASK\u003e\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120\n check_preemption_disabled+0xd0/0xe0 lib/smp_processor_id.c:49\n usbnet_skb_return+0x74/0x490 drivers/net/usb/usbnet.c:331\n usbnet_resume_rx+0x4b/0x170 drivers/net/usb/usbnet.c:708\n usbnet_change_mtu+0x1be/0x220 drivers/net/usb/usbnet.c:417\n __dev_set_mtu net/core/dev.c:9443 [inline]\n netif_set_mtu_ext+0x369/0x5c0 net/core/dev.c:9496\n netif_set_mtu+0xb0/0x160 net/core/dev.c:9520\n dev_set_mtu+0xae/0x170 net/core/dev_api.c:247\n dev_ifsioc+0xa31/0x18d0 net/core/dev_ioctl.c:572\n dev_ioctl+0x223/0x10e0 net/core/dev_ioctl.c:821\n sock_do_ioctl+0x19d/0x280 net/socket.c:1204\n sock_ioctl+0x42f/0x6a0 net/socket.c:1311\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:906 [inline]\n __se_sys_ioctl fs/ioctl.c:892 [inline]\n __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFor historical and portability reasons, the netif_rx() is usually\nrun in the softirq or interrupt context, this commit therefore add\nlocal_bh_disable/enable() protection in the usbnet_resume_rx()."
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  "id": "CVE-2025-40164",
  "lastModified": "2026-02-26T15:52:02.207",
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          "attackVector": "LOCAL",
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          "baseScore": 5.5,
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          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
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          "userInteraction": "NONE",
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  "published": "2025-11-12T11:15:46.660",
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Sightings

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Nomenclature

  • 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.
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  • 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.