media: rc: fix races with imon_disconnect()

{
  "id": "f7f1cc7b7fca933a0075ac5b4e435a69a3f601614967b2d31ff30b23482be338",
  "url": "https://osv.dev/vulnerability/CVE-2025-39993",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "media: rc: fix races with imon_disconnect()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: media: rc: fix races with imon_disconnect() Syzbot reports a KASAN issue as below: BUG: KASAN: use-after-free in __create_pipe include/linux/usb.h:1945 [inline] BUG: KASAN: use-after-free in send_packet+0xa2d/0xbc0 drivers/media/rc/imon.c:627 Read of size 4 at addr ffff8880256fb000 by task syz-executor314/4465 CPU: 2 PID: 4465 Comm: syz-executor314 Not tainted 6.0.0-rc1-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x6e9 mm/kasan/report.c:433 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495 __create_pipe include/linux/usb.h:1945 [inline] send_packet+0xa2d/0xbc0 drivers/media/rc/imon.c:627 vfd_write+0x2d9/0x550 drivers/media/rc/imon.c:991 vfs_write+0x2d7/0xdd0 fs/read_write.c:576 ksys_write+0x127/0x250 fs/read_write.c:631 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The iMON driver improperly releases the usb_device reference in imon_disconnect without coordinating with active users of the device. Specifically, the fields usbdev_intf0 and usbdev_intf1 are not protected by the users counter (ictx->users). During probe, imon_init_intf0 or imon_init_intf1 increments the usb_device reference count d",
    "evidence": "osv:CVE-2025-39993",
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        "prerequisites": [],
        "fixed_versions": [
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    "severity": "high",
    "structured": {
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      "modified": "2026-10-28T02:30:25.683949117Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2e7fd93b9cc565b839bc55a6662475718963e156",
        "https://git.kernel.org/stable/c/71096a6161a25e84acddb89a9d77f138502d26ab",
        "https://git.kernel.org/stable/c/71c52b073922d05e79e6de7fc7f5f38f927929a4",
        "https://git.kernel.org/stable/c/71da40648741d15b302700b68973fe8b382aef3c",
        "https://git.kernel.org/stable/c/9348976003e39754af344949579e824a0a210fc4",
        "https://git.kernel.org/stable/c/b03fac6e2a38331faf8510b480becfa90cea1c9f",
        "https://git.kernel.org/stable/c/d9f6ce99624a41c3bcb29a8d7d79b800665229dd",
        "https://git.kernel.org/stable/c/fa0f61cc1d828178aa921475a9b786e7fbb65ccb",
        "https://git.kernel.org/stable/c/fd5d3e6b149ec8cce045d86a2b5e3664d6b32ba5",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39993.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-39993",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 492517,
  "published_at": "2025-10-15T07:58:18.621+00:00"
}