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NVD / CVE Program· CNA Linux

CVE-2026-43028: netfilter: x_tables: ensure names are nul-terminated

Noroxi assessment

Priority: Monitor (action score 28/100)

  • 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 673bbd36cba21d10a10f0932f479df7468e26fbb, 73124608172890306b85f2206d8b3cac20e324f1, a958a4f90ddd7de0800b33ca9d7b886b7d40f74e.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 673bbd36cba21d10a10f0932f479df7468e26fbb, 73124608172890306b85f2206d8b3cac20e324f1, a958a4f90ddd7de0800b33ca9d7b886b7d40f74e 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: netfilter: x_tables: ensure names are nul-terminated Reject names that lack a \0 character before feeding them to functions that expect c-strings. Fixes tag is the most recent commit that needs this change.

HighCVSS 7.1 · v3.1—No exploit Fix available
Published
May 1, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.1
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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-2026-43028

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 kernel4.5 and later · before 5.10.253
  • linux linux kernel5.11 and later · before 5.15.203
  • linux linux kernel5.16 and later · before 6.1.168
  • linux linux kernel6.2 and later · before 6.6.134
  • linux linux kernel6.7 and later · before 6.12.81
  • linux linux kernel6.13 and later · before 6.18.22
  • linux linux kernel6.19 and later · before 6.19.12
  • linux linux kernel7.0

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

    • 4.5affected
    • c38c4597e4bf3e99860eac98211748e1ecb0e139 and later · before bcac50ea0a29d430eedc5ac87b215393b567baa9affected · git
    • c38c4597e4bf3e99860eac98211748e1ecb0e139 and later · before ea01c1b219f5a11c66918abaa6f052e5a74041d6affected · git
    • c38c4597e4bf3e99860eac98211748e1ecb0e139 and later · before aa6cd4a8863391e0a64f62d8922cb0af732a2cf2affected · git
    • c38c4597e4bf3e99860eac98211748e1ecb0e139 and later · before c2d4a3abb15ca14716c6d8b9ffcbcd7c63626af4affected · git
    • c38c4597e4bf3e99860eac98211748e1ecb0e139 and later · before 673bbd36cba21d10a10f0932f479df7468e26fbbaffected · git
    • c38c4597e4bf3e99860eac98211748e1ecb0e139 and later · before f419bdc205894750f4d3ec042bc87a1b9cde1351affected · git
    • c38c4597e4bf3e99860eac98211748e1ecb0e139 and later · before 73124608172890306b85f2206d8b3cac20e324f1affected · git
    • c38c4597e4bf3e99860eac98211748e1ecb0e139 and later · before a958a4f90ddd7de0800b33ca9d7b886b7d40f74eaffected · git
    • before 4.5not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.170-16.1.170-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.12-16.19.12-1

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-2026-43026May 1, 2026 · netfilter: ctnetlink: zero expect NAT fields when CTA_EXPECT_NAT absent
    22Monitor
  • ← EarlierCVE-2026-43027May 1, 2026 · netfilter: nf_conntrack_helper: pass helper to expect cleanup
    31Monitor
  • Later →CVE-2026-43030May 1, 2026 · bpf: Fix regsafe() for pointers to packet
    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 Linux673bbd36cba21d10a10f0932f479df7468e26fbbVendor (CNA)
Linux Linux73124608172890306b85f2206d8b3cac20e324f1Vendor (CNA)
Linux Linuxa958a4f90ddd7de0800b33ca9d7b886b7d40f74eVendor (CNA)
Linux Linuxaa6cd4a8863391e0a64f62d8922cb0af732a2cf2Vendor (CNA)
Linux Linuxbcac50ea0a29d430eedc5ac87b215393b567baa9Vendor (CNA)
Linux Linuxc2d4a3abb15ca14716c6d8b9ffcbcd7c63626af4Vendor (CNA)
Linux Linuxea01c1b219f5a11c66918abaa6f052e5a74041d6Vendor (CNA)
Linux Linuxf419bdc205894750f4d3ec042bc87a1b9cde1351Vendor (CNA)
debian:linux6.1.170-1 · 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.

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
high · data can be read
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
High
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-170 · Improper Null Termination

CVSS vector

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

nvd-secondary

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. SSVC exploitation— → none
  2. Fix✗ → ✓

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

References

Show all references (10 more)

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

All records