CVE-2025-68258 (GCVE-0-2025-68258)

Vulnerability from cvelistv5 – Published: 2025-12-16 14:45 – Updated: 2026-05-11 21:49
VLAI
Title
comedi: multiq3: sanitize config options in multiq3_attach()
Summary
In the Linux kernel, the following vulnerability has been resolved: comedi: multiq3: sanitize config options in multiq3_attach() Syzbot identified an issue [1] in multiq3_attach() that induces a task timeout due to open() or COMEDI_DEVCONFIG ioctl operations, specifically, in the case of multiq3 driver. This problem arose when syzkaller managed to craft weird configuration options used to specify the number of channels in encoder subdevice. If a particularly great number is passed to s->n_chan in multiq3_attach() via it->options[2], then multiple calls to multiq3_encoder_reset() at the end of driver-specific attach() method will be running for minutes, thus blocking tasks and affected devices as well. While this issue is most likely not too dangerous for real-life devices, it still makes sense to sanitize configuration inputs. Enable a sensible limit on the number of encoder chips (4 chips max, each with 2 channels) to stop this behaviour from manifesting. [1] Syzbot crash: INFO: task syz.2.19:6067 blocked for more than 143 seconds. ... Call Trace: <TASK> context_switch kernel/sched/core.c:5254 [inline] __schedule+0x17c4/0x4d60 kernel/sched/core.c:6862 __schedule_loop kernel/sched/core.c:6944 [inline] schedule+0x165/0x360 kernel/sched/core.c:6959 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7016 __mutex_lock_common kernel/locking/mutex.c:676 [inline] __mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:760 comedi_open+0xc0/0x590 drivers/comedi/comedi_fops.c:2868 chrdev_open+0x4cc/0x5e0 fs/char_dev.c:414 do_dentry_open+0x953/0x13f0 fs/open.c:965 vfs_open+0x3b/0x340 fs/open.c:1097 ...
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6643 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 77e01cdbad5175f56027fd6fae00bd0fc175651a , < f9ff87aac7b37d462246c46d28912d382a8e2ea6 (git)
Affected: 77e01cdbad5175f56027fd6fae00bd0fc175651a , < 4cde9a7e025cc09b88097c70606f6b30c22880f4 (git)
Affected: 77e01cdbad5175f56027fd6fae00bd0fc175651a , < ad7ed3c9c7b8408e8612697bc43a5441fe386c71 (git)
Affected: 77e01cdbad5175f56027fd6fae00bd0fc175651a , < 049f14557450351750f929ebfff36d849511e132 (git)
Affected: 77e01cdbad5175f56027fd6fae00bd0fc175651a , < 8952bc1973cd54158c35e06bfb8c29ace7375a48 (git)
Affected: 77e01cdbad5175f56027fd6fae00bd0fc175651a , < 8dc2f02d3bada9247f00bfd2e5f61f68c389a0a3 (git)
Affected: 77e01cdbad5175f56027fd6fae00bd0fc175651a , < 543f4c380c2e1f35e60528df7cb54705cda7fee3 (git)
Affected: 77e01cdbad5175f56027fd6fae00bd0fc175651a , < f24c6e3a39fa355dabfb684c9ca82db579534e72 (git)
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Linux Linux Affected: 2.6.30
Unaffected: 0 , < 2.6.30 (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: multiq3: sanitize config options in multiq3_attach()\n\nSyzbot identified an issue [1] in multiq3_attach() that induces a\ntask timeout due to open() or COMEDI_DEVCONFIG ioctl operations,\nspecifically, in the case of multiq3 driver.\n\nThis problem arose when syzkaller managed to craft weird configuration\noptions used to specify the number of channels in encoder subdevice.\nIf a particularly great number is passed to s-\u003en_chan in\nmultiq3_attach() via it-\u003eoptions[2], then multiple calls to\nmultiq3_encoder_reset() at the end of driver-specific attach() method\nwill be running for minutes, thus blocking tasks and affected devices\nas well.\n\nWhile this issue is most likely not too dangerous for real-life\ndevices, it still makes sense to sanitize configuration inputs. Enable\na sensible limit on the number of encoder chips (4 chips max, each\nwith 2 channels) to stop this behaviour from manifesting.\n\n[1] Syzbot crash:\nINFO: task syz.2.19:6067 blocked for more than 143 seconds.\n...\nCall Trace:\n \u003cTASK\u003e\n context_switch kernel/sched/core.c:5254 [inline]\n __schedule+0x17c4/0x4d60 kernel/sched/core.c:6862\n __schedule_loop kernel/sched/core.c:6944 [inline]\n schedule+0x165/0x360 kernel/sched/core.c:6959\n schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7016\n __mutex_lock_common kernel/locking/mutex.c:676 [inline]\n __mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:760\n comedi_open+0xc0/0x590 drivers/comedi/comedi_fops.c:2868\n chrdev_open+0x4cc/0x5e0 fs/char_dev.c:414\n do_dentry_open+0x953/0x13f0 fs/open.c:965\n vfs_open+0x3b/0x340 fs/open.c:1097\n..."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncomedi: multiq3: sanear opciones de configuraci\u00f3n en multiq3_attach()\n\nSyzbot identific\u00f3 un problema [1] en multiq3_attach() que induce un tiempo de espera agotado de tarea debido a operaciones open() o ioctl COMEDI_DEVCONFIG, espec\u00edficamente, en el caso del controlador multiq3.\n\nEste problema surgi\u00f3 cuando syzkaller logr\u00f3 crear opciones de configuraci\u00f3n extra\u00f1as utilizadas para especificar el n\u00famero de canales en el subdispositivo de codificador. Si se pasa un n\u00famero particularmente grande a s -\u003e n_chan en multiq3_attach() a trav\u00e9s de it -\u003e options[2], entonces m\u00faltiples llamadas a multiq3_encoder_reset() al final del m\u00e9todo attach() espec\u00edfico del controlador se ejecutar\u00e1n durante minutos, bloqueando as\u00ed las tareas y tambi\u00e9n los dispositivos afectados.\n\nSi bien este problema probablemente no sea demasiado peligroso para dispositivos de la vida real, todav\u00eda tiene sentido sanear las entradas de configuraci\u00f3n. Habilitar un l\u00edmite sensato en el n\u00famero de chips de codificador (4 chips como m\u00e1ximo, cada uno con 2 canales) para evitar que este comportamiento se manifieste.\n\n[1] Fallo de Syzbot:\nINFO: tarea syz.2.19:6067 bloqueada durante m\u00e1s de 143 segundos.\n...\nTraza de Llamadas:\n \u003cTAREA\u003e\n context_switch kernel/sched/core.c:5254 [en l\u00ednea]\n __schedule+0x17c4/0x4d60 kernel/sched/core.c:6862\n __schedule_loop kernel/sched/core.c:6944 [en l\u00ednea]\n schedule+0x165/0x360 kernel/sched/core.c:6959\n schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7016\n __mutex_lock_common kernel/locking/mutex.c:676 [en l\u00ednea]\n __mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:760\n comedi_open+0xc0/0x590 drivers/comedi/comedi_fops.c:2868\n chrdev_open+0x4cc/0x5e0 fs/char_dev.c:414\n do_dentry_open+0x953/0x13f0 fs/open.c:965\n vfs_open+0x3b/0x340 fs/open.c:1097\n..."
          }
        ],
        "id": "CVE-2025-68258",
        "lastModified": "2026-10-14T13:10:00.187",
        "metrics": {},
        "published": "2025-12-16T15:15:55.207",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/049f14557450351750f929ebfff36d849511e132"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/4cde9a7e025cc09b88097c70606f6b30c22880f4"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/543f4c380c2e1f35e60528df7cb54705cda7fee3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8952bc1973cd54158c35e06bfb8c29ace7375a48"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/8dc2f02d3bada9247f00bfd2e5f61f68c389a0a3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ad7ed3c9c7b8408e8612697bc43a5441fe386c71"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f24c6e3a39fa355dabfb684c9ca82db579534e72"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f9ff87aac7b37d462246c46d28912d382a8e2ea6"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-11-07T04:41:24+00:00",
      "cve": "CVE-2025-68258",
      "id": "CVE-2025-68258",
      "initial_release_date": "2025-12-16T00:00:00+00:00",
      "product_status:known_not_affected": "200",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: comedi: multiq3: sanitize config options in multiq3_attach()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68258.json",
      "version": "3"
    }
  }
}



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