{"id":"CVE-2025-68258","state":"PUBLISHED","title":"comedi: multiq3: sanitize config options in multiq3_attach()","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...","publishedAt":"2025-12-16T14:45:00.920Z","updatedAt":"2026-05-11T21:49:53.691Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"77e01cdbad5175f56027fd6fae00bd0fc175651a","status":"affected","lessThan":"f9ff87aac7b37d462246c46d28912d382a8e2ea6","versionType":"git"},{"version":"77e01cdbad5175f56027fd6fae00bd0fc175651a","status":"affected","lessThan":"4cde9a7e025cc09b88097c70606f6b30c22880f4","versionType":"git"},{"version":"77e01cdbad5175f56027fd6fae00bd0fc175651a","status":"affected","lessThan":"ad7ed3c9c7b8408e8612697bc43a5441fe386c71","versionType":"git"},{"version":"77e01cdbad5175f56027fd6fae00bd0fc175651a","status":"affected","lessThan":"049f14557450351750f929ebfff36d849511e132","versionType":"git"},{"version":"77e01cdbad5175f56027fd6fae00bd0fc175651a","status":"affected","lessThan":"8952bc1973cd54158c35e06bfb8c29ace7375a48","versionType":"git"},{"version":"77e01cdbad5175f56027fd6fae00bd0fc175651a","status":"affected","lessThan":"8dc2f02d3bada9247f00bfd2e5f61f68c389a0a3","versionType":"git"},{"version":"77e01cdbad5175f56027fd6fae00bd0fc175651a","status":"affected","lessThan":"543f4c380c2e1f35e60528df7cb54705cda7fee3","versionType":"git"},{"version":"77e01cdbad5175f56027fd6fae00bd0fc175651a","status":"affected","lessThan":"f24c6e3a39fa355dabfb684c9ca82db579534e72","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/comedi/drivers/multiq3.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.30","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.30","versionType":"semver"},{"version":"5.10.248","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.198","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.160","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.120","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.62","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.12","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18.1","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/comedi/drivers/multiq3.c"]}],"references":["https://git.kernel.org/stable/c/f9ff87aac7b37d462246c46d28912d382a8e2ea6","https://git.kernel.org/stable/c/4cde9a7e025cc09b88097c70606f6b30c22880f4","https://git.kernel.org/stable/c/ad7ed3c9c7b8408e8612697bc43a5441fe386c71","https://git.kernel.org/stable/c/049f14557450351750f929ebfff36d849511e132","https://git.kernel.org/stable/c/8952bc1973cd54158c35e06bfb8c29ace7375a48","https://git.kernel.org/stable/c/8dc2f02d3bada9247f00bfd2e5f61f68c389a0a3","https://git.kernel.org/stable/c/543f4c380c2e1f35e60528df7cb54705cda7fee3","https://git.kernel.org/stable/c/f24c6e3a39fa355dabfb684c9ca82db579534e72"],"weaknesses":[],"ingestedAt":"2026-10-29T20:09:56.034Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/68xxx/CVE-2025-68258.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-68258","state":"PUBLISHED","datePublished":"2025-12-16T14:45:00.920Z","dateUpdated":"2026-05-11T21:49:53.691Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-12-16T13:41:40.267Z"},"containers":{"cna":{"title":"comedi: multiq3: sanitize config options in multiq3_attach()","descriptions":[{"lang":"en","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->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..."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"77e01cdbad5175f56027fd6fae00bd0fc175651a","status":"affected","lessThan":"f9ff87aac7b37d462246c46d28912d382a8e2ea6","versionType":"git"},{"version":"77e01cdbad5175f56027fd6fae00bd0fc175651a","status":"affected","lessThan":"4cde9a7e025cc09b88097c70606f6b30c22880f4","versionType":"git"},{"version":"77e01cdbad5175f56027fd6fae00bd0fc175651a","status":"affected","lessThan":"ad7ed3c9c7b8408e8612697bc43a5441fe386c71","versionType":"git"},{"version":"77e01cdbad5175f56027fd6fae00bd0fc175651a","status":"affected","lessThan":"049f14557450351750f929ebfff36d849511e132","versionType":"git"},{"version":"77e01cdbad5175f56027fd6fae00bd0fc175651a","status":"affected","lessThan":"8952bc1973cd54158c35e06bfb8c29ace7375a48","versionType":"git"},{"version":"77e01cdbad5175f56027fd6fae00bd0fc175651a","status":"affected","lessThan":"8dc2f02d3bada9247f00bfd2e5f61f68c389a0a3","versionType":"git"},{"version":"77e01cdbad5175f56027fd6fae00bd0fc175651a","status":"affected","lessThan":"543f4c380c2e1f35e60528df7cb54705cda7fee3","versionType":"git"},{"version":"77e01cdbad5175f56027fd6fae00bd0fc175651a","status":"affected","lessThan":"f24c6e3a39fa355dabfb684c9ca82db579534e72","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/comedi/drivers/multiq3.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.30","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.30","versionType":"semver"},{"version":"5.10.248","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.198","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.160","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.120","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.62","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.17.12","status":"unaffected","lessThanOrEqual":"6.17.*","versionType":"semver"},{"version":"6.18.1","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/comedi/drivers/multiq3.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/f9ff87aac7b37d462246c46d28912d382a8e2ea6"},{"url":"https://git.kernel.org/stable/c/4cde9a7e025cc09b88097c70606f6b30c22880f4"},{"url":"https://git.kernel.org/stable/c/ad7ed3c9c7b8408e8612697bc43a5441fe386c71"},{"url":"https://git.kernel.org/stable/c/049f14557450351750f929ebfff36d849511e132"},{"url":"https://git.kernel.org/stable/c/8952bc1973cd54158c35e06bfb8c29ace7375a48"},{"url":"https://git.kernel.org/stable/c/8dc2f02d3bada9247f00bfd2e5f61f68c389a0a3"},{"url":"https://git.kernel.org/stable/c/543f4c380c2e1f35e60528df7cb54705cda7fee3"},{"url":"https://git.kernel.org/stable/c/f24c6e3a39fa355dabfb684c9ca82db579534e72"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T21:49:53.691Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"5.10.248"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"5.15.198"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.1.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.6.120"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.12.62"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.17.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.18.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.30","versionEndExcluding":"6.19"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}