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NVD / CVE Program· CNA Linux

CVE-2026-31692: rtnetlink: add missing netlink_ns_capable() check for peer netns

MediumCVSS 5.5 · v3.1—No exploit Fix available

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: 0.11% (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 0975b64ffb34560042090a5986c3a02e6c80f36f, 7b735ef81286007794a227ce2539419479c02a5f, d04cc16d3624218a5458b2b664ae431f1b3b334d; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0975b64ffb34560042090a5986c3a02e6c80f36f, 7b735ef81286007794a227ce2539419479c02a5f, d04cc16d3624218a5458b2b664ae431f1b3b334d; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes 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: rtnetlink: add missing netlink_ns_capable() check for peer netns rtnl_newlink() lacks a CAP_NET_ADMIN capability check on the peer network namespace when creating paired devices (veth, vxcan, netkit). This allows an unprivileged user with a user namespace to create interfaces in arbitrary network namespaces, including init_net. Add a netlink_ns_capable() check for CAP_NET_ADMIN in the peer namespace before allowing device creation to proceed.

Published
Apr 30, 2026
Updated
Nov 11, 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-2026-31692

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  • when exploit code appears or is weaponized
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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

    • 2.6.33affected
    • 81adee47dfb608df3ad0b91d230fb3cef75f0060 and later · before 0975b64ffb34560042090a5986c3a02e6c80f36faffected · git
    • 81adee47dfb608df3ad0b91d230fb3cef75f0060 and later · before d04cc16d3624218a5458b2b664ae431f1b3b334daffected · git
    • 81adee47dfb608df3ad0b91d230fb3cef75f0060 and later · before 7b735ef81286007794a227ce2539419479c02a5faffected · git
    • before 2.6.33not affected · semver
    • 6.18.24 and later · up to and including 6.18.*not affected · semver
    • 6.19.14 and later · up to and including 6.19.*not affected · semver
    • 7.0 and laternot affected · original_commit_for_fix

Affected versions

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

  • linux linux kernel2.6.33 and later · before 6.18.24
  • linux linux kernel6.19 and later · before 6.19.14
  • linux linux kernel7.0

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.39.1.el10_26.12.0-211.39.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.39.1.el10_26.12.0-211.39.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.39.1.el10_26.12.0-211.39.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.39.1.el10_26.12.0-211.39.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.39.1.el10_26.12.0-211.39.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.39.1.el10_26.12.0-211.39.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.39.1.el10_26.12.0-211.39.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.39.1.el10_26.12.0-211.39.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.39.1.el10_26.12.0-211.39.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.39.1.el10_26.12.0-211.39.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.39.1.el10_26.12.0-211.39.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.39.1.el10_26.12.0-211.39.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.39.1.el10_26.12.0-211.39.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.39.1.el10_26.12.0-211.39.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.39.1.el10_26.12.0-211.39.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.39.1.el10_26.12.0-211.39.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.39.1.el10_26.12.0-211.39.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.39.1.el10_26.12.0-211.39.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.39.1.el10_26.12.0-211.39.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.39.1.el10_26.12.0-211.39.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.39.1.el10_26.12.0-211.39.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.39.1.el10_26.12.0-211.39.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.39.1.el10_26.12.0-211.39.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.39.1.el10_26.12.0-211.39.1.el10_2

+96

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-2026-31690Apr 27, 2026 · firmware: thead: Fix buffer overflow and use standard endian macros
    31Monitor
  • ← EarlierCVE-2026-31691Apr 27, 2026 · igb: remove napi_synchronize() in igb_down()
    22Monitor
  • Later →CVE-2026-31786Apr 30, 2026 · Buffer overflow in drivers/xen/sys-hypervisor.c
    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 Linux0975b64ffb34560042090a5986c3a02e6c80f36fVendor (CNA)
Linux Linux7b735ef81286007794a227ce2539419479c02a5fVendor (CNA)
Linux Linuxd04cc16d3624218a5458b2b664ae431f1b3b334dVendor (CNA)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kernel 6.6.159.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kernel 6.6.161.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
almalinux:kernel6.12.0-211.39.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k6.12.0-211.39.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-core6.12.0-211.39.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug6.12.0-211.39.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-core6.12.0-211.39.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel6.12.0-211.39.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched6.12.0-211.39.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules6.12.0-211.39.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-core6.12.0-211.39.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra6.12.0-211.39.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel6.12.0-211.39.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel-matched6.12.0-211.39.1.el10_2 · AlmaLinux:10Package registry (OSV)
debian:linux6.19.14-1 · Debian:14Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:6.12.0-211.39.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel0:6.12.0-211.39.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel-matched0:6.12.0-211.39.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debuginfo0:6.12.0-211.39.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel0:6.12.0-211.39.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel-matched0:6.12.0-211.39.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-debuginfo0:6.12.0-211.39.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel0:6.12.0-211.39.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel-matched0:6.12.0-211.39.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debuginfo0:6.12.0-211.39.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)

+4

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.

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

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
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.

References

Show all references (2 more)

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

All records