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NVD / CVE Program· CNA Linux

CVE-2026-31416: netfilter: nfnetlink_log: account for netlink header size

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: 0.12% (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 09883bf257f4243ed5a1fd35078ec6f0d0f3696a, 3.11, 3.13; azl3 kernel 6.6.130.1-3 on Azure Linux 3.0 6.6.134.1-2.

Low priority for now. Upgrade to Linux Linux 09883bf257f4243ed5a1fd35078ec6f0d0f3696a, 3.11, 3.13; azl3 kernel 6.6.130.1-3 on Azure Linux 3.0 6.6.134.1-2 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: netfilter: nfnetlink_log: account for netlink header size This is a followup to an old bug fix: NLMSG_DONE needs to account for the netlink header size, not just the attribute size. This can result in a WARN splat + drop of the netlink message, but other than this there are no ill effects.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Apr 13, 2026
Updated
Nov 5, 2026
EPSS
0.1% · 1th 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%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

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-2026-31416

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 kernel3.10.61 and later · before 3.11
  • linux linux kernel3.12.34 and later · before 3.13
  • linux linux kernel3.14.25 and later · before 3.15
  • linux linux kernel3.18 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

    • 3a758a2b78da2f49f7165678faf999e946a0c4b5, 131172845aa2c804ffa9423455aee585061ea35e, b1fef6b81871a396f3b8702077333e769673c87b, add9183d993c12fb61ce0a674a424341d5be5b36, 3.18affected
    • 9dfa1dfe4d5e5e66a991321ab08afe69759d797a and later · before 4ec216410fac9de83c99177a160ebb8d42fad075affected · git
    • 9dfa1dfe4d5e5e66a991321ab08afe69759d797a and later · before 09883bf257f4243ed5a1fd35078ec6f0d0f3696aaffected · git
    • 9dfa1dfe4d5e5e66a991321ab08afe69759d797a and later · before 761b45c661af48da6a065868d59ab1e1f64fd9b6affected · git
    • 9dfa1dfe4d5e5e66a991321ab08afe69759d797a and later · before 607245c4dbb86d9a10dd8388da0fb82170a99b61affected · git
    • 9dfa1dfe4d5e5e66a991321ab08afe69759d797a and later · before 6b419700e459fbf707ca1543b7c1b57a60fedb73affected · git
    • 9dfa1dfe4d5e5e66a991321ab08afe69759d797a and later · before 88a8f56e6276f616baad4274c6b8e4683e26e520affected · git
    • 9dfa1dfe4d5e5e66a991321ab08afe69759d797a and later · before f08ffa3e1c8e36b6131f69c5eb23700c28cbd262affected · git
    • 9dfa1dfe4d5e5e66a991321ab08afe69759d797a and later · before 6d52a4a0520a6696bdde51caa11f2d6821cd0c01affected · git
    • 3.10.61 and later · before 3.11affected · 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-2026-31414Apr 13, 2026 · netfilter: nf_conntrack_expect: use expect->helper
    39Monitor
  • ← EarlierCVE-2026-31415Apr 13, 2026 · ipv6: avoid overflows in ip6_datagram_send_ctl()
    22Monitor
  • Later →CVE-2026-31417Apr 13, 2026 · net/x25: Fix overflow when accumulating packets
    30Monitor

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 Linux09883bf257f4243ed5a1fd35078ec6f0d0f3696aVendor (CNA)
Linux Linux3.11Vendor (CNA)
Linux Linux3.13Vendor (CNA)
Linux Linux3.15Vendor (CNA)
Linux Linux3.18Vendor (CNA)
Linux Linux4ec216410fac9de83c99177a160ebb8d42fad075Vendor (CNA)
Linux Linux607245c4dbb86d9a10dd8388da0fb82170a99b61Vendor (CNA)
Linux Linux6b419700e459fbf707ca1543b7c1b57a60fedb73Vendor (CNA)
Linux Linux6d52a4a0520a6696bdde51caa11f2d6821cd0c01Vendor (CNA)
Linux Linux761b45c661af48da6a065868d59ab1e1f64fd9b6Vendor (CNA)
Linux Linux88a8f56e6276f616baad4274c6b8e4683e26e520Vendor (CNA)
Linux Linuxf08ffa3e1c8e36b6131f69c5eb23700c28cbd262Vendor (CNA)
azl3 kernel 6.6.130.1-3 on Azure Linux 3.06.6.134.1-2 · CBL-Mariner ReleasesMicrosoft (MSRC)
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.

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. 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