comedi: me4000: Fix potential overrun of firmware buffer

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Summary

CVECVE-2026-31747
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-01 15:16:37 UTC
Updated2026-05-07 19:26:41 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: comedi: me4000: Fix potential overrun of firmware buffer `me4000_xilinx_download()` loads the firmware that was requested by `request_firmware()`. It is possible for it to overrun the source buffer because it blindly trusts the file format. It reads a data stream length from the first 4 bytes into variable `file_length` and reads the data stream contents of length `file_length` from offset 16 onwards. Add a test to ensure that the supplied firmware is long enough to contain the header and the data stream. On failure, log an error and return `-EINVAL`. Note: The firmware loading was totally broken before commit ac584af59945 ("staging: comedi: me4000: fix firmware downloading"), but that is the most sensible target for this fix.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

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

EPSS: 0.000240000 probability, percentile 0.068060000 (date 2026-05-05)

Problem Types: CWE-787

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 ac584af599452748187cf6d7865b1607c54ee443 8ddfe6495c245226a30d8b36e2f4a7aa7712e8d6 git Not specified
CNA Linux Linux affected ac584af599452748187cf6d7865b1607c54ee443 64b24b713e1a3ea6624480594b4f8c2ff86502f2 git Not specified
CNA Linux Linux affected ac584af599452748187cf6d7865b1607c54ee443 f72b5567f7c117b46b4058dc6a0c7554f8565561 git Not specified
CNA Linux Linux affected ac584af599452748187cf6d7865b1607c54ee443 1603dd471f47762e9d1f52304edb3e49a7e62655 git Not specified
CNA Linux Linux affected ac584af599452748187cf6d7865b1607c54ee443 99f31aa98ab6e3805c455b65bcd01b3d48bdf1a5 git Not specified
CNA Linux Linux affected ac584af599452748187cf6d7865b1607c54ee443 eae19cab44204537f79146f15a51811b13227c38 git Not specified
CNA Linux Linux affected ac584af599452748187cf6d7865b1607c54ee443 de3f923ae7d91480ed3ecea1b1e1fc0dc25b597d git Not specified
CNA Linux Linux affected ac584af599452748187cf6d7865b1607c54ee443 3fb43a7a5b44713f892c58ead2e5f3a1bc9f4ee7 git Not specified
CNA Linux Linux affected 3.19 Not specified
CNA Linux Linux unaffected 3.19 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.168 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.134 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.81 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/64b24b713e1a3ea6624480594b4f8c2ff86502f2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/de3f923ae7d91480ed3ecea1b1e1fc0dc25b597d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/eae19cab44204537f79146f15a51811b13227c38 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f72b5567f7c117b46b4058dc6a0c7554f8565561 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/1603dd471f47762e9d1f52304edb3e49a7e62655 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/8ddfe6495c245226a30d8b36e2f4a7aa7712e8d6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3fb43a7a5b44713f892c58ead2e5f3a1bc9f4ee7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/99f31aa98ab6e3805c455b65bcd01b3d48bdf1a5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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