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CVE-2025-38481· NVD / CVE Program· CNA Linux

comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 08ae4b20f5e82101d77326ecab9089e110f224cc, 454d732dfd0aef7d7aa950c409215ca06d717e93, 69dc06b9514522de532e997a21d035cd29b0db44; azl3 kernel 6.6.96.2-2 on Azure Linux 3.0 6.6.104.2-1.

Low priority for now. Upgrade to Linux Linux 08ae4b20f5e82101d77326ecab9089e110f224cc, 454d732dfd0aef7d7aa950c409215ca06d717e93, 69dc06b9514522de532e997a21d035cd29b0db44; azl3 kernel 6.6.96.2-2 on Azure Linux 3.0 6.6.104.2-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large The handling of the `COMEDI_INSNLIST` ioctl allocates a kernel buffer to hold the array of `struct comedi_insn`, getting the length from the `n_insns` member of the `struct comedi_insnlist` supplied by the user. The allocation will fail with a WARNING and a stack dump if it is too large. Avoid that by failing with an `-EINVAL` error if the supplied `n_insns` value is unreasonable. Define the limit on the `n_insns` value in the `MAX_INSNS` macro. Set this to the same value as `MAX_SAMPLES` (65536), which is the maximum allowed sum of the values of the member `n` in the array of `struct comedi_insn`, and sensible comedi instructions will have an `n` of at least 1.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Jul 28, 2025
Updated
Jun 17, 2026
EPSS
0.1% · 6th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
debiandebian linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux11.0
  • linux linux kernel5.5 and later · before 5.10.241
  • linux linux kernel5.11 and later · before 5.15.190
  • linux linux kernel5.16 and later · before 6.1.147
  • linux linux kernel2.6.29 and later · before 5.4.297
  • linux linux kernel6.7 and later · before 6.12.40
  • linux linux kernel6.13 and later · before 6.15.8
  • linux linux kernel6.2 and later · before 6.6.100
  • linux linux kernel6.16

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.29affected
    • ed9eccbe8970f6eedc1b978c157caf1251a896d4 and later · before 454d732dfd0aef7d7aa950c409215ca06d717e93affected · git
    • ed9eccbe8970f6eedc1b978c157caf1251a896d4 and later · before c68257588e87f45530235701a42496b7e9e56adbaffected · git
    • ed9eccbe8970f6eedc1b978c157caf1251a896d4 and later · before 69dc06b9514522de532e997a21d035cd29b0db44affected · git
    • ed9eccbe8970f6eedc1b978c157caf1251a896d4 and later · before d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3affected · git
    • ed9eccbe8970f6eedc1b978c157caf1251a896d4 and later · before c9d3d9667443caafa804cd07940aeaef8e53aa90affected · git
    • ed9eccbe8970f6eedc1b978c157caf1251a896d4 and later · before 992d600f284e719242a434166e86c1999649b71caffected · git
    • ed9eccbe8970f6eedc1b978c157caf1251a896d4 and later · before e3b8322cc8081d142ee4c1a43e1d702bdba1ed76affected · git
    • ed9eccbe8970f6eedc1b978c157caf1251a896d4 and later · before 08ae4b20f5e82101d77326ecab9089e110f224ccaffected · git
    • before 2.6.29not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.147-16.1.147-1
Debian:13linuxbefore 6.12.41-16.12.41-1
Debian:14linuxbefore 6.16.3-16.16.3-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2025-38477Jul 28, 2025 · net/sched: sch_qfq: Fix race condition on qfq_aggregate
    18Monitor
  • ← EarlierCVE-2025-38480Jul 28, 2025 · comedi: Fix use of uninitialized data in insn_rw_emulate_bits()
    22Monitor
  • Later →CVE-2025-38482Jul 28, 2025 · comedi: das6402: Fix bit shift out of bounds
    28Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux08ae4b20f5e82101d77326ecab9089e110f224ccVendor (CNA)
Linux Linux454d732dfd0aef7d7aa950c409215ca06d717e93Vendor (CNA)
Linux Linux69dc06b9514522de532e997a21d035cd29b0db44Vendor (CNA)
Linux Linux992d600f284e719242a434166e86c1999649b71cVendor (CNA)
Linux Linuxc68257588e87f45530235701a42496b7e9e56adbVendor (CNA)
Linux Linuxc9d3d9667443caafa804cd07940aeaef8e53aa90Vendor (CNA)
Linux Linuxd4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3Vendor (CNA)
Linux Linuxe3b8322cc8081d142ee4c1a43e1d702bdba1ed76Vendor (CNA)
azl3 kernel 6.6.96.2-2 on Azure Linux 3.06.6.104.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.147-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (9 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records