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NVD / CVE Program· CNA Linux

CVE-2025-40106: comedi: fix divide-by-zero in comedi_buf_munge()

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 2670932f2465793fea1ef073e40883e8390fa4d9, 4ffea48c69cb2b96a281cb7e5e42d706996631db, 55520f65fd447e04099a2c44185453c18ea73b7e.

Low priority for now. Upgrade to Linux Linux 2670932f2465793fea1ef073e40883e8390fa4d9, 4ffea48c69cb2b96a281cb7e5e42d706996631db, 55520f65fd447e04099a2c44185453c18ea73b7e 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: fix divide-by-zero in comedi_buf_munge() The comedi_buf_munge() function performs a modulo operation `async->munge_chan %= async->cmd.chanlist_len` without first checking if chanlist_len is zero. If a user program submits a command with chanlist_len set to zero, this causes a divide-by-zero error when the device processes data in the interrupt handler path. Add a check for zero chanlist_len at the beginning of the function, similar to the existing checks for !map and CMDF_RAWDATA flag. When chanlist_len is zero, update munge_count and return early, indicating the data was handled without munging. This prevents potential kernel panics from malformed user commands.

—No exploit Fix available
Published
Oct 31, 2025
Updated
Oct 19, 2026
EPSS
0.2% · 11th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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  • A fix has been released

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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.

—

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 4ffea48c69cb2b96a281cb7e5e42d706996631dbaffected · git
    • ed9eccbe8970f6eedc1b978c157caf1251a896d4 and later · before 8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10caffected · git
    • ed9eccbe8970f6eedc1b978c157caf1251a896d4 and later · before 2670932f2465793fea1ef073e40883e8390fa4d9affected · git
    • ed9eccbe8970f6eedc1b978c157caf1251a896d4 and later · before 6db19822512396be1a3e1e20c16c97270285ba1aaffected · git
    • ed9eccbe8970f6eedc1b978c157caf1251a896d4 and later · before d4854eff25efb06d0d84c13e7129bbdba4125f8caffected · git
    • ed9eccbe8970f6eedc1b978c157caf1251a896d4 and later · before a4bb5d1bc2f238461bcbe5303eb500466690bb2caffected · git
    • ed9eccbe8970f6eedc1b978c157caf1251a896d4 and later · before 55520f65fd447e04099a2c44185453c18ea73b7eaffected · git
    • ed9eccbe8970f6eedc1b978c157caf1251a896d4 and later · before 87b318ba81dda2ee7b603f4f6c55e78ec3e95974affected · 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 6.1.158-16.1.158-1
Debian:13linuxbefore 6.12.57-16.12.57-1
Debian:14linuxbefore 6.17.6-16.17.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2025-40104Oct 30, 2025 · ixgbevf: fix mailbox API compatibility by negotiating supported features
    31Monitor
  • ← EarlierCVE-2025-40105Oct 30, 2025 · vfs: Don't leak disconnected dentries on umount
    31Monitor
  • Later →CVE-2025-40107Nov 3, 2025 · can: hi311x: fix null pointer dereference when resuming from sleep before interface was enabled
    0Monitor

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 Linux2670932f2465793fea1ef073e40883e8390fa4d9Vendor (CNA)
Linux Linux4ffea48c69cb2b96a281cb7e5e42d706996631dbVendor (CNA)
Linux Linux55520f65fd447e04099a2c44185453c18ea73b7eVendor (CNA)
Linux Linux6db19822512396be1a3e1e20c16c97270285ba1aVendor (CNA)
Linux Linux87b318ba81dda2ee7b603f4f6c55e78ec3e95974Vendor (CNA)
Linux Linux8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10cVendor (CNA)
Linux Linuxa4bb5d1bc2f238461bcbe5303eb500466690bb2cVendor (CNA)
Linux Linuxd4854eff25efb06d0d84c13e7129bbdba4125f8cVendor (CNA)
debian:linux6.1.158-1 · 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

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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 (7 more)

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

All records