GHSA-F2F6-PQF4-6HG9

Vulnerability from github – Published: 2025-11-12 12:30 – Updated: 2026-06-19 15:33
VLAI
Details

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: __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().

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2025-40164"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-11-12T11:15:46Z",
    "severity": "MODERATE"
  },
  "details": "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().",
  "id": "GHSA-f2f6-pqf4-6hg9",
  "modified": "2026-06-19T15:33:07Z",
  "published": "2025-11-12T12:30:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40164"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0134c7bff14bd50314a4f92b182850ddfc38e255"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/17fbad93879e87a334062882b45fa727ba1b3dd7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/327cd4b68b4398b6c24f10eb2b2533ffbfc10185"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/65d04291adf7c59338f87aab9c6fe0bfa9993e64"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6635e52bc4165793aefd686962d912d73d323afe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d1944bab8e0c1511f0cbf364aa06547735bb0ddb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f45fffae5e2549bd0a4670cc52a15ad54c9f121e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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