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comedi: Fix initialization of data for instructions that write to subdevice

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: comedi: Fix initialization of data for instructions that write to subdevice Some Comedi subdevice instruction handlers are known to access instruction data elements beyond the first `insn->n` elements in some cases. The `do_insn_ioctl()` and `do_insnlist_ioctl()` functions allocate at least `MIN_SAMPLES` (16) data elements to deal with this, but they do not initialize all of that. For Comedi instruction codes that write to the subdevice, the first `insn->n` data elements are copied from user-space, but the remaining elements are left uninitialized. That could be a problem if the subdevice instruction handler reads the uninitialized data. Ensure that the first `MIN_SAMPLES` elements are initialized before calling these instruction handlers, filling the uncopied elements with 0. For `do_insnlist_ioctl()`, the same data buffer elements are used for handling a list of instructions, so ensure the first `MIN_SAMPLES` elements are initialized for each instruction that writes to the subdevice.

Announced Source revision 1
Original source ↗

CVE-2025-38478

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2025-38478

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
        "lessThan": "6f38c6380c3b38a05032b8881e41137385a6ce02",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
        "lessThan": "13e4d9038a1e869445a996a3f604a84ef52fe8f4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
        "lessThan": "020eed5681d0f9bced73970368078a92d6cfaa9c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
        "lessThan": "d3436638738ace8f101af7bdee2eae1bc38e9b29",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
        "lessThan": "673ee92bd2d31055bca98a1d96b653f5284289c4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
        "lessThan": "c42116dc70af6664526f7aa82cf937824ab42649",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
        "lessThan": "fe8713fb4e4e82a4f91910d9a41bf0613e69a0b9",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "46d8c744136ce2454aa4c35c138cc06817f92b8e",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/comedi/comedi_fops.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.29"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.29",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.4.297",
        "versionType": "semver",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.241",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.190",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.147",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.100",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.40",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.15.8",
        "versionType": "semver",
        "lessThanOrEqual": "6.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.16",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/comedi/comedi_fops.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-38478

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30578 · Revision 1
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Publisher date
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