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CVE-2025-39684 (GCVE-0-2025-39684)

Vulnerability from cvelistv5 – Published: 2025-09-05 17:20 – Updated: 2026-05-12 12:06
VLAI
Title
comedi: Fix use of uninitialized memory in do_insn_ioctl() and do_insnlist_ioctl()
Summary
In the Linux kernel, the following vulnerability has been resolved: comedi: Fix use of uninitialized memory in do_insn_ioctl() and do_insnlist_ioctl() syzbot reports a KMSAN kernel-infoleak in `do_insn_ioctl()`. A kernel buffer is allocated to hold `insn->n` samples (each of which is an `unsigned int`). For some instruction types, `insn->n` samples are copied back to user-space, unless an error code is being returned. The problem is that not all the instruction handlers that need to return data to userspace fill in the whole `insn->n` samples, so that there is an information leak. There is a similar syzbot report for `do_insnlist_ioctl()`, although it does not have a reproducer for it at the time of writing. One culprit is `insn_rw_emulate_bits()` which is used as the handler for `INSN_READ` or `INSN_WRITE` instructions for subdevices that do not have a specific handler for that instruction, but do have an `INSN_BITS` handler. For `INSN_READ` it only fills in at most 1 sample, so if `insn->n` is greater than 1, the remaining `insn->n - 1` samples copied to userspace will be uninitialized kernel data. Another culprit is `vm80xx_ai_insn_read()` in the "vm80xx" driver. It never returns an error, even if it fails to fill the buffer. Fix it in `do_insn_ioctl()` and `do_insnlist_ioctl()` by making sure that uninitialized parts of the allocated buffer are zeroed before handling each instruction. Thanks to Arnaud Lecomte for their fix to `do_insn_ioctl()`. That fix replaced the call to `kmalloc_array()` with `kcalloc()`, but it is not always necessary to clear the whole buffer.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 868a1b68dcd9f2805bb86aa64862402f785d8c4a (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < ff4a7c18799c7fe999fa56c5cf276e13866b8c1a (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < d84f6e77ebe3359394df32ecd97e0d76a25283dc (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < f3b0c9ec54736f3b8118f93a473d22e11ee65743 (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < aecf0d557ddd95ce68193a5ee1dc4c87415ff08a (git)
Affected: ed9eccbe8970f6eedc1b978c157caf1251a896d4 , < 3cd212e895ca2d58963fdc6422502b10dd3966bb (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.29
Unaffected: 0 , < 2.6.29 (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.149 , ≤ 6.1.* (semver)
Unaffected: 6.6.103 , ≤ 6.6.* (semver)
Unaffected: 6.12.44 , ≤ 6.12.* (semver)
Unaffected: 6.16.4 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC CN 4100 Affected: 0 , < V5.0 (custom)
guessed Create a notification for this product.
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Party Advisory\"]},{\"url\":\"https://cert-portal.siemens.com/productcert/html/ssa-032379.html\",\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-30T10:29:04+00:00",
      "cve": "CVE-2025-39684",
      "id": "CVE-2025-39684",
      "initial_release_date": "2025-09-05T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: comedi: Fix use of uninitialized memory in do_insn_ioctl() and do_insnlist_ioctl()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39684.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:59:19Z",
      "cve": "CVE-2025-39684",
      "id": "CVE-2025-39684",
      "initial_release_date": "2025-09-08T23:22:51Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "789",
      "product_status:recommended": "464",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-39684",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-39684.json",
      "version": "57"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.