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CVE-2025-68335— comedi: pcl818: fix null-ptr-deref in pcl818_ai_cancel()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于pcl818_ai_cancel函数存在空指针取消引用问题。

AI Predicted 4.4 Difficulty: Moderate EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 00aba6e7b5653a6607238ecdab7172318059d984< b2a5b172dc05be6c4f2c5542c1bbc6b14d60ff16 affected
00aba6e7b5653a6607238ecdab7172318059d984< 935ad4b3c325c24fff2c702da403283025ffc722 affected
00aba6e7b5653a6607238ecdab7172318059d984< 88d99ca5adbd01ff088f5fb2ddeba5755e085e52 affected
00aba6e7b5653a6607238ecdab7172318059d984< 5caa40e7c6a43e08e3574f990865127705c22861 affected
00aba6e7b5653a6607238ecdab7172318059d984< d948c53dec36dafe182631457597c49c1f1df5ea affected
00aba6e7b5653a6607238ecdab7172318059d984< 877adccfacb32687b90714a27cfb09f444fdfa16 affected
00aba6e7b5653a6607238ecdab7172318059d984< a51f025b5038abd3d22eed2ede4cd46793d89565 affected
3.15 affected
… +8 more rows
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I. Basic Information for CVE-2025-68335

Vulnerability Information
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Vulnerability Title
comedi: pcl818: fix null-ptr-deref in pcl818_ai_cancel()
Source: CVE Program / CVE List V5
Vulnerability 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] ...
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于pcl818_ai_cancel函数存在空指针取消引用问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 00aba6e7b5653a6607238ecdab7172318059d984 ~ b2a5b172dc05be6c4f2c5542c1bbc6b14d60ff16 -
Linux Linux 3.15 -

II. Public POCs for CVE-2025-68335

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III. Intelligence Information for CVE-2025-68335

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Same Patch Batch · Linux · 2025-12-22 · 12 CVEs total

CVE-2025-68337 7.5 HIGH jbd2: avoid bug_on in jbd2_journal_get_create_access() when file system corrupted
CVE-2025-68336 7.5 HIGH locking/spinlock/debug: Fix data-race in do_raw_write_lock
CVE-2025-68334 platform/x86/amd/pmc: Add support for Van Gogh SoC
CVE-2025-68333 sched_ext: Fix possible deadlock in the deferred_irq_workfn()
CVE-2025-68332 comedi: c6xdigio: Fix invalid PNP driver unregistration
CVE-2025-68331 usb: uas: fix urb unmapping issue when the uas device is remove during ongoing data transf
CVE-2025-68330 iio: accel: bmc150: Fix irq assumption regression
CVE-2025-68329 tracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs
CVE-2025-68328 firmware: stratix10-svc: fix bug in saving controller data
CVE-2025-68327 usb: renesas_usbhs: Fix synchronous external abort on unbind
CVE-2025-68326 drm/xe/guc: Fix stack_depot usage

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-68335

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