{"id":"CVE-2025-68258","url":"https://www.cyber-defence.io/tools/cve/CVE-2025-68258","generatedAt":"2026-10-28T01:19:16.171Z","title":"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…","description":"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->n_chan in\nmultiq3_attach() via it->options[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 <TASK>\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...","published":"2025-12-16T15:15:55.000Z","lastModified":"2026-10-14T13:10:00.000Z","status":"Deferred","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":null,"cwe":[],"affected":[],"epss":{"score":0.00197,"percentile":0.09333,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"unknown","text":"Not yet scored. NVD analysis is pending; check back once CVSS and EPSS values are published."},"changes":[],"references":[{"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","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-68258","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}