comedi: Fix initialization of data for instructions that write to subdevice
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.
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",
"version": "ed9eccbe8970f6eedc1b978c157caf1251a896d4",
"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
- Added to Heist Feed
- Publisher date