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NVD / CVE Program· CNA Linux

CVE-2025-40080: nbd: restrict sockets to TCP and UDP

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: 0.20% (FIRST EPSS).
  • Fixed version: Linux Linux 37ad11f20e164c23ce827dd455b42c0fdd29685c, 4.15, 4.20; azl3 kernel 6.6.104.2-4 on Azure Linux 3.0 6.6.112.1-2.

Low priority for now. Upgrade to Linux Linux 37ad11f20e164c23ce827dd455b42c0fdd29685c, 4.15, 4.20; azl3 kernel 6.6.104.2-4 on Azure Linux 3.0 6.6.112.1-2 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: nbd: restrict sockets to TCP and UDP Recently, syzbot started to abuse NBD with all kinds of sockets. Commit cf1b2326b734 ("nbd: verify socket is supported during setup") made sure the socket supported a shutdown() method. Explicitely accept TCP and UNIX stream sockets.

—No exploit Fix available
Published
Oct 28, 2025
Updated
Oct 19, 2026
EPSS
0.2% · 10th 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%

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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Follow CVE-2025-40080

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.

—

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

    • 4df728651b8a99693c69962d8e5a5b9e5a3bbcc7, 083322455c67d278c56a66b73f1221f004ee600a, 4fa1cbd587ef967812f9d9f6ce46ec1dead7502c, 5.4affected
    • cf1b2326b734896734c6e167e41766f9cee7686a and later · before c365e8f20f4201d873a70385bd919f0fb531e960affected · git
    • cf1b2326b734896734c6e167e41766f9cee7686a and later · before 4f9e6ff6319dbcebea64b50af0304cf0ad7e97e7affected · git
    • cf1b2326b734896734c6e167e41766f9cee7686a and later · before 37ad11f20e164c23ce827dd455b42c0fdd29685caffected · git
    • cf1b2326b734896734c6e167e41766f9cee7686a and later · before 808e2335bc1cf2293b9e36ccc94c267c81509c71affected · git
    • cf1b2326b734896734c6e167e41766f9cee7686a and later · before 9f7c02e031570e8291a63162c6c046dc15ff85b0affected · git
    • 4.14.152 and later · before 4.15affected · semver
    • 4.19.82 and later · before 4.20affected · semver
    • 5.3.9 and later · before 5.4affected · semver
    • before 5.4not 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-2025-40078Oct 28, 2025 · bpf: Explicitly check accesses to bpf_sock_addr
    0Monitor
  • ← EarlierCVE-2025-40079Oct 28, 2025 · riscv, bpf: Sign extend struct ops return values properly
    31Monitor
  • Later →CVE-2025-40081Oct 28, 2025 · perf: arm_spe: Prevent overflow in PERF_IDX2OFF()
    31Monitor

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 Linux37ad11f20e164c23ce827dd455b42c0fdd29685cVendor (CNA)
Linux Linux4.15Vendor (CNA)
Linux Linux4.20Vendor (CNA)
Linux Linux4f9e6ff6319dbcebea64b50af0304cf0ad7e97e7Vendor (CNA)
Linux Linux5.4Vendor (CNA)
Linux Linux808e2335bc1cf2293b9e36ccc94c267c81509c71Vendor (CNA)
Linux Linux9f7c02e031570e8291a63162c6c046dc15ff85b0Vendor (CNA)
Linux Linuxc365e8f20f4201d873a70385bd919f0fb531e960Vendor (CNA)
azl3 kernel 6.6.104.2-4 on Azure Linux 3.06.6.112.1-2 · CBL-Mariner ReleasesMicrosoft (MSRC)
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.

No history yet (it accumulates with the daily EPSS job).

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✗ → ✓

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References

Show all references (6 more)

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

All records