CVE-2025-68257 (GCVE-0-2025-68257)

Vulnerability from cvelistv5 – Published: 2025-12-16 14:44 – Updated: 2026-05-11 21:49
VLAI
Title
comedi: check device's attached status in compat ioctls
Summary
In the Linux kernel, the following vulnerability has been resolved: comedi: check device's attached status in compat ioctls Syzbot identified an issue [1] that crashes kernel, seemingly due to unexistent callback dev->get_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's 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->get_valid_routes() callback. Fix this somewhat crudely by ensuring device's 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: <TASK> get_valid_routes drivers/comedi/comedi_fops.c:1322 [inline] parse_insn+0x78c/0x1970 drivers/comedi/comedi_fops.c:1401 do_insnlist_ioctl+0x272/0x700 drivers/comedi/comedi_fops.c:1594 compat_insnlist drivers/comedi/comedi_fops.c:3208 [inline] comedi_compat_ioctl+0x810/0x990 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+0x242/0x370 fs/ioctl.c:638 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] ...
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3fbfd2223a271426509830e6340c386a1054cfad , < 4836ba483a22ebd076c8faaf8293a7295fad4142 (git)
Affected: 3fbfd2223a271426509830e6340c386a1054cfad , < 7141915bf0c41cb57d83cdbaf695b8c731b16b71 (git)
Affected: 3fbfd2223a271426509830e6340c386a1054cfad , < f13895c03620933a58907e3250016f087e39b78c (git)
Affected: 3fbfd2223a271426509830e6340c386a1054cfad , < b975f91de5f8f63cf490f0393775cc795f8b0557 (git)
Affected: 3fbfd2223a271426509830e6340c386a1054cfad , < f6e629dfe6f590091c662a87c9fcf118b1c1c7dc (git)
Affected: 3fbfd2223a271426509830e6340c386a1054cfad , < 573b07d2e3d473ee7eb625ef87519922cf01168d (git)
Affected: 3fbfd2223a271426509830e6340c386a1054cfad , < aac80e912de306815297a3b74f0426873ffa7dc3 (git)
Affected: 3fbfd2223a271426509830e6340c386a1054cfad , < 0de7d9cd07a2671fa6089173bccc0b2afe6b93ee (git)
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Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 5.15.198 , ≤ 5.15.* (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (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 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: check device\u0027s attached status in compat ioctls\n\nSyzbot identified an issue [1] that crashes kernel, seemingly due to\nunexistent callback dev-\u003eget_valid_routes(). By all means, this should\nnot occur as said callback must always be set to\nget_zero_valid_routes() in __comedi_device_postconfig().\n\nAs the crash seems to appear exclusively in i386 kernels, at least,\njudging from [1] reports, the blame lies with compat versions\nof standard IOCTL handlers. Several of them are modified and\ndo not use comedi_unlocked_ioctl(). While functionality of these\nioctls essentially copy their original versions, they do not\nhave required sanity check for device\u0027s attached status. This,\nin turn, leads to a possibility of calling select IOCTLs on a\ndevice that has not been properly setup, even via COMEDI_DEVCONFIG.\n\nDoing so on unconfigured devices means that several crucial steps\nare missed, for instance, specifying dev-\u003eget_valid_routes()\ncallback.\n\nFix this somewhat crudely by ensuring device\u0027s attached status before\nperforming any ioctls, improving logic consistency between modern\nand compat functions.\n\n[1] Syzbot report:\nBUG: kernel NULL pointer dereference, address: 0000000000000000\n...\nCR2: ffffffffffffffd6 CR3: 000000006c717000 CR4: 0000000000352ef0\nCall Trace:\n \u003cTASK\u003e\n get_valid_routes drivers/comedi/comedi_fops.c:1322 [inline]\n parse_insn+0x78c/0x1970 drivers/comedi/comedi_fops.c:1401\n do_insnlist_ioctl+0x272/0x700 drivers/comedi/comedi_fops.c:1594\n compat_insnlist drivers/comedi/comedi_fops.c:3208 [inline]\n comedi_compat_ioctl+0x810/0x990 drivers/comedi/comedi_fops.c:3273\n __do_compat_sys_ioctl fs/ioctl.c:695 [inline]\n __se_compat_sys_ioctl fs/ioctl.c:638 [inline]\n __ia32_compat_sys_ioctl+0x242/0x370 fs/ioctl.c:638\n do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]\n..."
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncomedi: check device\u0027s attached status in compat ioctls\n\nSyzbot identified an issue [1] that crashes kernel, seemingly due to\nunexistent callback dev-\u003eget_valid_routes(). By all means, this should\nnot occur as said callback must always be set to\nget_zero_valid_routes() in __comedi_device_postconfig().\n\nAs the crash seems to appear exclusively in i386 kernels, at least,\njudging from [1] reports, the blame lies with compat versions\nof standard IOCTL handlers. Several of them are modified and\ndo not use comedi_unlocked_ioctl(). While functionality of these\nioctls essentially copy their original versions, they do not\nhave required sanity check for device\u0027s attached status. This,\nin turn, leads to a possibility of calling select IOCTLs on a\ndevice that has not been properly setup, even via COMEDI_DEVCONFIG.\n\nDoing so on unconfigured devices means that several crucial steps\nare missed, for instance, specifying dev-\u003eget_valid_routes()\ncallback.\n\nFix this somewhat crudely by ensuring device\u0027s attached status before\nperforming any ioctls, improving logic consistency between modern\nand compat functions.\n\n[1] Syzbot report:\nBUG: kernel NULL pointer dereference, address: 0000000000000000\n...\nCR2: ffffffffffffffd6 CR3: 000000006c717000 CR4: 0000000000352ef0\nCall Trace:\n \u003cTASK\u003e\n get_valid_routes drivers/comedi/comedi_fops.c:1322 [inline]\n parse_insn+0x78c/0x1970 drivers/comedi/comedi_fops.c:1401\n do_insnlist_ioctl+0x272/0x700 drivers/comedi/comedi_fops.c:1594\n compat_insnlist drivers/comedi/comedi_fops.c:3208 [inline]\n comedi_compat_ioctl+0x810/0x990 drivers/comedi/comedi_fops.c:3273\n __do_compat_sys_ioctl fs/ioctl.c:695 [inline]\n __se_compat_sys_ioctl fs/ioctl.c:638 [inline]\n __ia32_compat_sys_ioctl+0x242/0x370 fs/ioctl.c:638\n do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]\n..."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncomedi: verificar el estado de conexi\u00f3n del dispositivo en ioctls de compatibilidad\n\nSyzbot identific\u00f3 un problema [1] que bloquea el kernel, aparentemente debido a una devoluci\u00f3n de llamada inexistente dev -\u003e get_valid_routes(). Bajo ninguna circunstancia, esto no deber\u00eda ocurrir, ya que dicha devoluci\u00f3n de llamada siempre debe establecerse en get_zero_valid_routes() en __comedi_device_postconfig().\n\nDado que el bloqueo parece aparecer exclusivamente en kernels i386, al menos, a juzgar por los informes [1], la culpa recae en las versiones de compatibilidad de los manejadores IOCTL est\u00e1ndar. Varias de ellas est\u00e1n modificadas y no utilizan comedi_unlocked_ioctl(). Si bien la funcionalidad de estos ioctls esencialmente copia sus versiones originales, no tienen la verificaci\u00f3n de cordura requerida para el estado de conexi\u00f3n del dispositivo. Esto, a su vez, conduce a la posibilidad de llamar a ciertos IOCTLs en un dispositivo que no ha sido configurado correctamente, incluso a trav\u00e9s de COMEDI_DEVCONFIG.\n\nHacer esto en dispositivos no configurados significa que se omiten varios pasos cruciales, por ejemplo, especificar la devoluci\u00f3n de llamada dev -\u003e get_valid_routes().\n\nEsto se soluciona de forma algo rudimentaria asegurando el estado de conexi\u00f3n del dispositivo antes de realizar cualquier ioctl, mejorando la consistencia l\u00f3gica entre funciones modernas y de compatibilidad.\n\n[1] Informe de Syzbot:\nERROR: desreferencia de puntero NULL del kernel, direcci\u00f3n: 0000000000000000\n...\nCR2: ffffffffffffffd6 CR3: 000000006c717000 CR4: 0000000000352ef0\nRastreo de llamadas:\n \u003cTASK\u003e\n get_valid_routes drivers/comedi/comedi_fops.c:1322 [inline]\n parse_insn+0x78c/0x1970 drivers/comedi/comedi_fops.c:1401\n do_insnlist_ioctl+0x272/0x700 drivers/comedi/comedi_fops.c:1594\n compat_insnlist drivers/comedi/comedi_fops.c:3208 [inline]\n comedi_compat_ioctl+0x810/0x990 drivers/comedi/comedi_fops.c:3273\n __do_compat_sys_ioctl fs/ioctl.c:695 [inline]\n __se_compat_sys_ioctl fs/ioctl.c:638 [inline]\n __ia32_compat_sys_ioctl+0x242/0x370 fs/ioctl.c:638\n do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]\n..."
          }
        ],
        "id": "CVE-2025-68257",
        "lastModified": "2026-10-14T13:10:00.187",
        "metrics": {},
        "published": "2025-12-16T15:15:55.100",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/0de7d9cd07a2671fa6089173bccc0b2afe6b93ee"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/4836ba483a22ebd076c8faaf8293a7295fad4142"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/573b07d2e3d473ee7eb625ef87519922cf01168d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/7141915bf0c41cb57d83cdbaf695b8c731b16b71"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/aac80e912de306815297a3b74f0426873ffa7dc3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b975f91de5f8f63cf490f0393775cc795f8b0557"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f13895c03620933a58907e3250016f087e39b78c"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f6e629dfe6f590091c662a87c9fcf118b1c1c7dc"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T01:33:52+00:00",
      "cve": "CVE-2025-68257",
      "id": "CVE-2025-68257",
      "initial_release_date": "2025-12-16T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: comedi: check device\u0027s attached status in compat ioctls",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68257.json",
      "version": "3"
    }
  }
}



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