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NVD / CVE Program· CNA Linux

CVE-2026-31674: netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check()

HighCVSS 7.1 · v3.1—No exploit Fix available

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: 0.16% (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 13e3e30ed3b5b67cc1db2bd58a5d09b0f07debfa, 29ea965a1353bc8303877422f79c8211e9ba9c55, 9d3f027327c2fa265f7f85ead41294792c3296ed; 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 13e3e30ed3b5b67cc1db2bd58a5d09b0f07debfa, 29ea965a1353bc8303877422f79c8211e9ba9c55, 9d3f027327c2fa265f7f85ead41294792c3296ed; 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: ip6t_rt: reject oversized addrnr in rt_mt6_check() Reject rt match rules whose addrnr exceeds IP6T_RT_HOPS. rt_mt6() expects addrnr to stay within the bounds of rtinfo->addrs[]. Validate addrnr during rule installation so malformed rules are rejected before the match logic can use an out-of-range value.

Published
Apr 25, 2026
Updated
Nov 11, 2026
EPSS
0.1% · 6th 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

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Follow CVE-2026-31674

When you'll hear from us

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  • 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

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

    • 2.6.12affected
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 13e3e30ed3b5b67cc1db2bd58a5d09b0f07debfaaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before af9b7e2b765966457f4ec23be5bd34a141f89574affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 29ea965a1353bc8303877422f79c8211e9ba9c55affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before c6a503a9f4debc654e3a6a7ca1f7fce6a9953c59affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before ded71f5684df16fa645cca5bf4fe6b0cd8a46119affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before d8795fde1f78669a87c87ac29fceab2f104daa8caffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before a28ebf6f99de270d6338ccdc3b49f3e818f99b7baffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 9d3f027327c2fa265f7f85ead41294792c3296edaffected · git
    • before 2.6.12not affected · semver
Affected versions · NVD (9)

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

  • linux linux kernel2.6.12.1 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 6.6.131
  • linux linux kernel6.7 and later · before 6.12.80
  • linux linux kernel6.13 and later · before 6.18.21
  • linux linux kernel6.19 and later · before 6.19.11
  • linux linux kernel2.6.12
  • linux linux kernel7.0

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 6.19.11-16.19.11-1
SUSE:Linux Enterprise Live Patching 15 SP7kernel-livepatch-SLE15-SP7_Update_17before 1-150700.15.3.11-150700.15.3.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-64kbbefore 6.4.0-150700.53.63.16.4.0-150700.53.63.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-defaultbefore 6.4.0-150700.53.63.16.4.0-150700.53.63.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-default-basebefore 6.4.0-150700.53.63.1.150700.17.37.16.4.0-150700.53.63.1.150700.17.37.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-sourcebefore 6.4.0-150700.53.63.16.4.0-150700.53.63.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7kernel-zfcpdumpbefore 6.4.0-150700.53.63.16.4.0-150700.53.63.1
SUSE:Linux Enterprise Module for Development Tools 15 SP7kernel-docsbefore 6.4.0-150700.53.63.16.4.0-150700.53.63.1
SUSE:Linux Enterprise Module for Development Tools 15 SP7kernel-obs-buildbefore 6.4.0-150700.53.63.16.4.0-150700.53.63.1
SUSE:Linux Enterprise Module for Development Tools 15 SP7kernel-symsbefore 6.4.0-150700.53.63.16.4.0-150700.53.63.1
SUSE:Linux Enterprise Module for Public Cloud 15 SP7kernel-azurebefore 6.4.0-150700.53.63.16.4.0-150700.53.63.1
SUSE:Linux Micro 6.0kernel-defaultbefore 6.4.0-48.16.4.0-48.1
SUSE:Linux Micro 6.0kernel-default-basebefore 6.4.0-48.1.21.256.4.0-48.1.21.25
SUSE:Linux Micro 6.0kernel-kvmsmallbefore 6.4.0-48.16.4.0-48.1
SUSE:Linux Micro 6.0kernel-sourcebefore 6.4.0-48.16.4.0-48.1

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-2026-31672Apr 24, 2026 · wifi: rt2x00usb: fix devres lifetime
    22Monitor
  • ← EarlierCVE-2026-31673Apr 25, 2026 · af_unix: read UNIX_DIAG_VFS data under unix_state_lock
    31Monitor
  • Later →CVE-2026-31675Apr 25, 2026 · net/sched: sch_netem: fix out-of-bounds access in packet corruption
    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 Linux13e3e30ed3b5b67cc1db2bd58a5d09b0f07debfaVendor (CNA)
Linux Linux29ea965a1353bc8303877422f79c8211e9ba9c55Vendor (CNA)
Linux Linux9d3f027327c2fa265f7f85ead41294792c3296edVendor (CNA)
Linux Linuxa28ebf6f99de270d6338ccdc3b49f3e818f99b7bVendor (CNA)
Linux Linuxaf9b7e2b765966457f4ec23be5bd34a141f89574Vendor (CNA)
Linux Linuxc6a503a9f4debc654e3a6a7ca1f7fce6a9953c59Vendor (CNA)
Linux Linuxd8795fde1f78669a87c87ac29fceab2f104daa8cVendor (CNA)
Linux Linuxded71f5684df16fa645cca5bf4fe6b0cd8a46119Vendor (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)
suse:kernel-64kb6.4.0-150700.53.63.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)
suse:kernel-azure6.4.0-150700.53.63.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP7Package registry (OSV)
suse:kernel-default6.4.0-48.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-default-base6.4.0-48.1.21.25 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-docs6.4.0-150700.53.63.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP7Package registry (OSV)
suse:kernel-kvmsmall6.4.0-48.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-livepatch-SLE15-SP7_Update_171-150700.15.3.1 · SUSE:Linux Enterprise Live Patching 15 SP7Package registry (OSV)
suse:kernel-obs-build6.4.0-150700.53.63.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP7Package registry (OSV)
suse:kernel-source6.4.0-48.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:kernel-syms6.4.0-150700.53.63.1 · SUSE:Linux Enterprise Module for Development Tools 15 SP7Package registry (OSV)
suse:kernel-zfcpdump6.4.0-150700.53.63.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package 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.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

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-125 · Out-of-bounds Read

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.

ATT&CK techniques

—

References

Show all references (10 more)

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

All records