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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-38478
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-07-28 12:15:29 UTC
Updated2026-07-30 06:23:20 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-908

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 6f38c6380c3b38a05032b8881e41137385a6ce02 git Not specified
CNA Linux Linux affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 13e4d9038a1e869445a996a3f604a84ef52fe8f4 git Not specified
CNA Linux Linux affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 020eed5681d0f9bced73970368078a92d6cfaa9c git Not specified
CNA Linux Linux affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 d3436638738ace8f101af7bdee2eae1bc38e9b29 git Not specified
CNA Linux Linux affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 673ee92bd2d31055bca98a1d96b653f5284289c4 git Not specified
CNA Linux Linux affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 c42116dc70af6664526f7aa82cf937824ab42649 git Not specified
CNA Linux Linux affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 fe8713fb4e4e82a4f91910d9a41bf0613e69a0b9 git Not specified
CNA Linux Linux affected ed9eccbe8970f6eedc1b978c157caf1251a896d4 46d8c744136ce2454aa4c35c138cc06817f92b8e git Not specified
CNA Linux Linux affected 2.6.29 Not specified
CNA Linux Linux unaffected 2.6.29 semver Not specified
CNA Linux Linux unaffected 5.4.297 5.4.* semver Not specified
CNA Linux Linux unaffected 5.10.241 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.190 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.147 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.100 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.40 6.12.* semver Not specified
CNA Linux Linux unaffected 6.15.8 6.15.* semver Not specified
CNA Linux Linux unaffected 6.16 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/020eed5681d0f9bced73970368078a92d6cfaa9c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/10/msg00008.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/673ee92bd2d31055bca98a1d96b653f5284289c4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/fe8713fb4e4e82a4f91910d9a41bf0613e69a0b9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/46d8c744136ce2454aa4c35c138cc06817f92b8e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c42116dc70af6664526f7aa82cf937824ab42649 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/13e4d9038a1e869445a996a3f604a84ef52fe8f4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/10/msg00007.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/d3436638738ace8f101af7bdee2eae1bc38e9b29 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6f38c6380c3b38a05032b8881e41137385a6ce02 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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