{
  "cveId": "CVE-2025-68257",
  "url": "https://patchblox.com/security/cve/CVE-2025-68257",
  "summary": "CVE-2025-68257 is fixed in 20 products on 1 platform, first by DEBIAN-CVE-2025-68257, released December 16, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "comedi: check device\u0027s attached status in compat ioctls",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  comedi: check device\u0027s attached status in compat ioctls  Syzbot identified an issue [1] that crashes kernel, seemingly due to unexistent callback dev-\u003Eget_valid_routes(). By all means, this should not occur as said callback must always be set to get_zero_valid_routes() in __comedi_device_postconfig().  As the crash seems to appear exclusively in i386 kernels, at least, judging from [1] reports, the blame lies with compat versions of standard IOCTL handlers. Several of them are modified and do not use comedi_unlocked_ioctl(). While functionality of these ioctls essentially copy their original versions, they do not have required sanity check for device\u0027s attached status. This, in turn, leads to a possibility of calling select IOCTLs on a device that has not been properly setup, even via COMEDI_DEVCONFIG.  Doing so on unconfigured devices means that several crucial steps are missed, for instance, specifying dev-\u003Eget_valid_routes() callback.  Fix this somewhat crudely by ensuring device\u0027s attached status before performing any ioctls, improving logic consistency between modern and compat functions.  [1] Syzbot report: BUG: kernel NULL pointer dereference, address: 0000000000000000 ... CR2: ffffffffffffffd6 CR3: 000000006c717000 CR4: 0000000000352ef0 Call Trace:  \u003CTASK\u003E  get_valid_routes drivers/comedi/comedi_fops.c:1322 [inline]  parse_insn\u002B0x78c/0x1970 drivers/comedi/comedi_fops.c:1401  do_insnlist_ioctl\u002B0x272/0x700 drivers/comedi/comedi_fops.c:1594  compat_insnlist drivers/comedi/comedi_fops.c:3208 [inline]  comedi_compat_ioctl\u002B0x810/0x990 drivers/comedi/comedi_fops.c:3273  __do_compat_sys_ioctl fs/ioctl.c:695 [inline]  __se_compat_sys_ioctl fs/ioctl.c:638 [inline]  __ia32_compat_sys_ioctl\u002B0x242/0x370 fs/ioctl.c:638  do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] ...",
  "published": "2025-12-16T15:15:55Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "epss": 0.00197,
  "epssPercentile": 0.09477,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-68257",
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