CVE-2025-68335 (GCVE-0-2025-68335)

Vulnerability from cvelistv5 – Published: 2025-12-22 16:14 – Updated: 2025-12-22 16:14
VLAI?
Title
comedi: pcl818: fix null-ptr-deref in pcl818_ai_cancel()
Summary
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] ...
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 00aba6e7b5653a6607238ecdab7172318059d984 , < 5caa40e7c6a43e08e3574f990865127705c22861 (git)
Affected: 00aba6e7b5653a6607238ecdab7172318059d984 , < d948c53dec36dafe182631457597c49c1f1df5ea (git)
Affected: 00aba6e7b5653a6607238ecdab7172318059d984 , < 877adccfacb32687b90714a27cfb09f444fdfa16 (git)
Affected: 00aba6e7b5653a6607238ecdab7172318059d984 , < a51f025b5038abd3d22eed2ede4cd46793d89565 (git)
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    Linux Linux Affected: 3.15
Unaffected: 0 , < 3.15 (semver)
Unaffected: 6.12.62 , ≤ 6.12.* (semver)
Unaffected: 6.17.12 , ≤ 6.17.* (semver)
Unaffected: 6.18.1 , ≤ 6.18.* (semver)
Unaffected: 6.19-rc1 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/comedi/drivers/pcl818.c"
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          "product": "Linux",
          "programFiles": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "version": "0",
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                  "versionStartIncluding": "3.15",
                  "vulnerable": true
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                  "versionEndExcluding": "6.17.12",
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: pcl818: fix null-ptr-deref in pcl818_ai_cancel()\n\nSyzbot identified an issue [1] in pcl818_ai_cancel(), which stems from\nthe fact that in case of early device detach via pcl818_detach(),\nsubdevice dev-\u003eread_subdev may not have initialized its pointer to\n\u0026struct comedi_async as intended. Thus, any such dereferencing of\n\u0026s-\u003easync-\u003ecmd will lead to general protection fault and kernel crash.\n\nMitigate this problem by removing a call to pcl818_ai_cancel() from\npcl818_detach() altogether. This way, if the subdevice setups its\nsupport for async commands, everything async-related will be\nhandled via subdevice\u0027s own -\u003ecancel() function in\ncomedi_device_detach_locked() even before pcl818_detach(). If no\nsupport for asynchronous commands is provided, there is no need\nto cancel anything either.\n\n[1] Syzbot crash:\nOops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN PTI\nKASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]\nCPU: 1 UID: 0 PID: 6050 Comm: syz.0.18 Not tainted syzkaller #0 PREEMPT(full)\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025\nRIP: 0010:pcl818_ai_cancel+0x69/0x3f0 drivers/comedi/drivers/pcl818.c:762\n...\nCall Trace:\n \u003cTASK\u003e\n pcl818_detach+0x66/0xd0 drivers/comedi/drivers/pcl818.c:1115\n comedi_device_detach_locked+0x178/0x750 drivers/comedi/drivers.c:207\n do_devconfig_ioctl drivers/comedi/comedi_fops.c:848 [inline]\n comedi_unlocked_ioctl+0xcde/0x1020 drivers/comedi/comedi_fops.c:2178\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:597 [inline]\n..."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-22T16:14:12.614Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/5caa40e7c6a43e08e3574f990865127705c22861"
        },
        {
          "url": "https://git.kernel.org/stable/c/d948c53dec36dafe182631457597c49c1f1df5ea"
        },
        {
          "url": "https://git.kernel.org/stable/c/877adccfacb32687b90714a27cfb09f444fdfa16"
        },
        {
          "url": "https://git.kernel.org/stable/c/a51f025b5038abd3d22eed2ede4cd46793d89565"
        }
      ],
      "title": "comedi: pcl818: fix null-ptr-deref in pcl818_ai_cancel()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68335",
    "datePublished": "2025-12-22T16:14:12.614Z",
    "dateReserved": "2025-12-16T14:48:05.297Z",
    "dateUpdated": "2025-12-22T16:14:12.614Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-68335\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-22T17:16:01.237\",\"lastModified\":\"2025-12-23T14:51:52.650\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncomedi: pcl818: fix null-ptr-deref in pcl818_ai_cancel()\\n\\nSyzbot identified an issue [1] in pcl818_ai_cancel(), which stems from\\nthe fact that in case of early device detach via pcl818_detach(),\\nsubdevice dev-\u003eread_subdev may not have initialized its pointer to\\n\u0026struct comedi_async as intended. Thus, any such dereferencing of\\n\u0026s-\u003easync-\u003ecmd will lead to general protection fault and kernel crash.\\n\\nMitigate this problem by removing a call to pcl818_ai_cancel() from\\npcl818_detach() altogether. This way, if the subdevice setups its\\nsupport for async commands, everything async-related will be\\nhandled via subdevice\u0027s own -\u003ecancel() function in\\ncomedi_device_detach_locked() even before pcl818_detach(). If no\\nsupport for asynchronous commands is provided, there is no need\\nto cancel anything either.\\n\\n[1] Syzbot crash:\\nOops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN PTI\\nKASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]\\nCPU: 1 UID: 0 PID: 6050 Comm: syz.0.18 Not tainted syzkaller #0 PREEMPT(full)\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025\\nRIP: 0010:pcl818_ai_cancel+0x69/0x3f0 drivers/comedi/drivers/pcl818.c:762\\n...\\nCall Trace:\\n \u003cTASK\u003e\\n pcl818_detach+0x66/0xd0 drivers/comedi/drivers/pcl818.c:1115\\n comedi_device_detach_locked+0x178/0x750 drivers/comedi/drivers.c:207\\n do_devconfig_ioctl drivers/comedi/comedi_fops.c:848 [inline]\\n comedi_unlocked_ioctl+0xcde/0x1020 drivers/comedi/comedi_fops.c:2178\\n vfs_ioctl fs/ioctl.c:51 [inline]\\n __do_sys_ioctl fs/ioctl.c:597 [inline]\\n...\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5caa40e7c6a43e08e3574f990865127705c22861\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/877adccfacb32687b90714a27cfb09f444fdfa16\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a51f025b5038abd3d22eed2ede4cd46793d89565\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d948c53dec36dafe182631457597c49c1f1df5ea\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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