{
  "cveId": "CVE-2025-68335",
  "url": "https://patchblox.com/security/cve/CVE-2025-68335",
  "summary": "CVE-2025-68335 is fixed in 20 products on 1 platform, first by DEBIAN-CVE-2025-68335, released December 22, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  comedi: pcl818: fix null-ptr-deref in pcl818_ai_...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  comedi: pcl818: fix null-ptr-deref in pcl818_ai_cancel()  Syzbot identified an issue [1] in pcl818_ai_cancel(), which stems from the fact that in case of early device detach via pcl818_detach(), subdevice dev-\u003Eread_subdev may not have initialized its pointer to \u0026struct comedi_async as intended. Thus, any such dereferencing of \u0026s-\u003Easync-\u003Ecmd will lead to general protection fault and kernel crash.  Mitigate this problem by removing a call to pcl818_ai_cancel() from pcl818_detach() altogether. This way, if the subdevice setups its support for async commands, everything async-related will be handled via subdevice\u0027s own -\u003Ecancel() function in comedi_device_detach_locked() even before pcl818_detach(). If no support for asynchronous commands is provided, there is no need to cancel anything either.  [1] Syzbot crash: Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] CPU: 1 UID: 0 PID: 6050 Comm: syz.0.18 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 RIP: 0010:pcl818_ai_cancel\u002B0x69/0x3f0 drivers/comedi/drivers/pcl818.c:762 ... Call Trace:  \u003CTASK\u003E  pcl818_detach\u002B0x66/0xd0 drivers/comedi/drivers/pcl818.c:1115  comedi_device_detach_locked\u002B0x178/0x750 drivers/comedi/drivers.c:207  do_devconfig_ioctl drivers/comedi/comedi_fops.c:848 [inline]  comedi_unlocked_ioctl\u002B0xcde/0x1020 drivers/comedi/comedi_fops.c:2178  vfs_ioctl fs/ioctl.c:51 [inline]  __do_sys_ioctl fs/ioctl.c:597 [inline] ...",
  "published": "2025-12-22T17:16:01Z",
  "severity": "",
  "epss": 0.00193,
  "epssPercentile": 0.08967,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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