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CVE PROGRAM SOURCE RECORDUnscored

CVE-2025-68335

comedi: pcl818: fix null-ptr-deref in pcl818_ai_cancel()

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Status
Published
Published
Updated
Assigning organization
Linux

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->read_subdev may not have initialized its pointer to &struct comedi_async as intended. Thus, any such dereferencing of &s->async->cmd 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's own ->cancel() 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+0x69/0x3f0 drivers/comedi/drivers/pcl818.c:762 ... Call Trace: <TASK> pcl818_detach+0x66/0xd0 drivers/comedi/drivers/pcl818.c:1115 comedi_device_detach_locked+0x178/0x750 drivers/comedi/drivers.c:207 do_devconfig_ioctl drivers/comedi/comedi_fops.c:848 [inline] comedi_unlocked_ioctl+0xcde/0x1020 drivers/comedi/comedi_fops.c:2178 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] ...

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 00aba6e7b5653a6607238ecdab7172318059d984 to < b2a5b172dc05be6c4f2c5542c1bbc6b14d60ff16affected
  • 00aba6e7b5653a6607238ecdab7172318059d984 to < 935ad4b3c325c24fff2c702da403283025ffc722affected
  • 00aba6e7b5653a6607238ecdab7172318059d984 to < 88d99ca5adbd01ff088f5fb2ddeba5755e085e52affected
  • 00aba6e7b5653a6607238ecdab7172318059d984 to < 5caa40e7c6a43e08e3574f990865127705c22861affected
  • 00aba6e7b5653a6607238ecdab7172318059d984 to < d948c53dec36dafe182631457597c49c1f1df5eaaffected
  • 00aba6e7b5653a6607238ecdab7172318059d984 to < 877adccfacb32687b90714a27cfb09f444fdfa16affected
  • 00aba6e7b5653a6607238ecdab7172318059d984 to < a51f025b5038abd3d22eed2ede4cd46793d89565affected

Linux Linux

Default version status: affected

  • 3.15affected
  • 0 to < 3.15unaffected
  • 5.15.198 to ≤ 5.15.*unaffected
  • 6.1.160 to ≤ 6.1.*unaffected
  • 6.6.120 to ≤ 6.6.*unaffected
  • 6.12.62 to ≤ 6.12.*unaffected
  • 6.17.12 to ≤ 6.17.*unaffected
  • 6.18.1 to ≤ 6.18.*unaffected
  • 6.19 to ≤ *unaffected

References