CVE-2025-68258: comedi: multiq3: sanitize config options in multiq3_attach()
Vulnerability summary
CVE-2025-68258 is a vulnerability in linux with no CVSS score yet. EPSS estimates a 0.20% chance of exploitation in the next 30 days, higher than 9.5% of scored vulnerabilities.
No CVSS vector published; no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 47 · Related 45Timeline
- 16-12-2025PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
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 ...
CVSS metrics
Risk metrics not yet published.
EPSS trend
Probability
0.20%
Chance of exploitation in the next 30 days
Percentile
10%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.20% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Known conditions: not stated in public data.
Ubuntu156 products
- linuxAll versions (No fix recorded) | < 5.15.0-173.183 | < 6.8.0-110.110 | < 6.17.0-19.19
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1103.110 | < 6.8.0-1052.55 | < 6.17.0-1009.9
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian1 product
- linux< 6.1.162-1 | < 6.12.63-1 | < 6.17.12-1
Linux1 product
- linux≥ 77e01cdbad5175f56027fd6fae00bd0fc175651a, < f9ff87aac7b37d462246c46d28912d382a8e2ea6 | ≥ 77e01cdbad5175f56027fd6fae00bd0fc175651a, < 4cde9a7e025cc09b88097c70606f6b30c22880f4 | ≥ 77e01cdbad5175f56027fd6fae00bd0fc175651a, < ad7ed3c9c7b8408e8612697bc43a5441fe386c71 | ≥ 77e01cdbad5175f56027fd6fae00bd0fc175651a, < 049f14557450351750f929ebfff36d849511e132 | ≥ 77e01cdbad5175f56027fd6fae00bd0fc175651a, < 8952bc1973cd54158c35e06bfb8c29ace7375a48 | ≥ 77e01cdbad5175f56027fd6fae00bd0fc175651a, < 8dc2f02d3bada9247f00bfd2e5f61f68c389a0a3 | ≥ 77e01cdbad5175f56027fd6fae00bd0fc175651a, < 543f4c380c2e1f35e60528df7cb54705cda7fee3 | ≥ 77e01cdbad5175f56027fd6fae00bd0fc175651a, < f24c6e3a39fa355dabfb684c9ca82db579534e72 | 2.6.30
3 vendors · 158 products
