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NVD / CVE Program· CNA Linux

CVE-2026-45930: net: mctp: ensure our nlmsg responses are initialised

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: 0.13% (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 54ed418de62a148a655262da682a050fa05f7924, 6fb6a97c86abb8592158088afaea0eb464cf9de1, 963537a26fd892f7e414a091f807b44aeee97a7d; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 54ed418de62a148a655262da682a050fa05f7924, 6fb6a97c86abb8592158088afaea0eb464cf9de1, 963537a26fd892f7e414a091f807b44aeee97a7d; azl3 kernel 6.6.141.1-1 on Azure Linux 3.0 6.6.143.1-1 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: net: mctp: ensure our nlmsg responses are initialised Syed Faraz Abrar (@farazsth98) from Zellic, and Pumpkin (@u1f383) from DEVCORE Research Team working with Trend Micro Zero Day Initiative report that a RTM_GETNEIGH will return uninitalised data in the pad bytes of the ndmsg data. Ensure we're initialising the netlink data to zero, in the link, addr and neigh response messages.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 27, 2026
Updated
Jun 25, 2026
EPSS
0.1% · 2th 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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-45930

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • 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

Affected versions

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

  • linux linux kernel5.15 and later · before 5.15.210
  • linux linux kernel5.16 and later · before 6.1.176
  • linux linux kernel6.2 and later · before 6.6.143
  • linux linux kernel6.7 and later · before 6.12.93
  • linux linux kernel6.13 and later · before 6.18.35
  • linux linux kernel6.19 and later · before 6.19.4

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

    • 5.15affected
    • 583be982d93479ea3d85091b0fd0b01201ede87d and later · before b37da3ac099e145bcd3be82c745a8d335772e3afaffected · git
    • 583be982d93479ea3d85091b0fd0b01201ede87d and later · before c4f840437e7641764de15f2de951ac8335d641f1affected · git
    • 583be982d93479ea3d85091b0fd0b01201ede87d and later · before 963537a26fd892f7e414a091f807b44aeee97a7daffected · git
    • 583be982d93479ea3d85091b0fd0b01201ede87d and later · before 976612471a9e6ead6ceffc241e4d0a1aac90b36aaffected · git
    • 583be982d93479ea3d85091b0fd0b01201ede87d and later · before 54ed418de62a148a655262da682a050fa05f7924affected · git
    • 583be982d93479ea3d85091b0fd0b01201ede87d and later · before 6fb6a97c86abb8592158088afaea0eb464cf9de1affected · git
    • 583be982d93479ea3d85091b0fd0b01201ede87d and later · before a6a9bc544b675d8b5180f2718ec985ad267b5cbfaffected · git
    • before 5.15not affected · semver
    • 5.15.210 and later · up to and including 5.15.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
Debian:13linuxbefore 6.12.94-16.12.94-1
Debian:14linuxbefore 6.19.6-16.19.6-1
SUSE:Linux Micro 6.0kernel-defaultbefore 6.4.0-159998.54.16.4.0-159998.54.1
SUSE:Linux Micro 6.0kernel-default-basebefore 6.4.0-159998.54.1.159998.21.406.4.0-159998.54.1.159998.21.40
SUSE:Linux Micro 6.0kernel-kvmsmallbefore 6.4.0-159998.54.16.4.0-159998.54.1
SUSE:Linux Micro 6.0kernel-sourcebefore 6.4.0-159998.54.16.4.0-159998.54.1
SUSE:Linux Micro 6.1kernel-default-basebefore 6.4.0-159998.54.1.159998.21.396.4.0-159998.54.1.159998.21.39

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • 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

Published before and after this one in the same product

  • ← EarlierCVE-2026-45928May 27, 2026 · media: chips-media: wave5: Fix memory leak on codec_info allocation failure
    22Monitor
  • ← EarlierCVE-2026-45929May 27, 2026 · ovpn: fix possible use-after-free in ovpn_net_xmit
    31Monitor
  • Later →CVE-2026-45931May 27, 2026 · accel/amdxdna: Hold mm structure across iommu_sva_unbind_device()
    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 Linux54ed418de62a148a655262da682a050fa05f7924Vendor (CNA)
Linux Linux6fb6a97c86abb8592158088afaea0eb464cf9de1Vendor (CNA)
Linux Linux963537a26fd892f7e414a091f807b44aeee97a7dVendor (CNA)
Linux Linux976612471a9e6ead6ceffc241e4d0a1aac90b36aVendor (CNA)
Linux Linuxa6a9bc544b675d8b5180f2718ec985ad267b5cbfVendor (CNA)
Linux Linuxb37da3ac099e145bcd3be82c745a8d335772e3afVendor (CNA)
Linux Linuxc4f840437e7641764de15f2de951ac8335d641f1Vendor (CNA)
azl3 kernel 6.6.141.1-1 on Azure Linux 3.06.6.143.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.176-1 · Debian:12Package registry (OSV)
suse:kernel-default6.4.0-159998.54.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-default-base6.4.0-159998.54.1.159998.21.40 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-kvmsmall6.4.0-159998.54.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-source6.4.0-159998.54.1 · SUSE:Linux Micro 6.0Package 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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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 (6 more)

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

All records