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NVD / CVE Program· CNA Linux

CVE-2026-68432: vxlan: require CAP_NET_ADMIN in the device netns for changelink

Noroxi assessment

Priority: Monitor (action score 35/100)

  • 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: 0.14% (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 0aa580a8bbbed2507b4582a1f0ef581d480d06ed, 32d10c46bfde3e9b274e9e1bd6399d0ebea8f60f, 3a61bd9637f3d929aa846e4eb3d98b48c26fcb0e; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1.

Low priority for now. Upgrade to Linux Linux 0aa580a8bbbed2507b4582a1f0ef581d480d06ed, 32d10c46bfde3e9b274e9e1bd6399d0ebea8f60f, 3a61bd9637f3d929aa846e4eb3d98b48c26fcb0e; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1 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: vxlan: require CAP_NET_ADMIN in the device netns for changelink A tunnel changelink() operates on at most two netns, dev_net(dev) and the sticky underlay netns vxlan->net. They differ once the device is created in or moved to a netns other than the one the request runs in. The rtnl changelink path checks CAP_NET_ADMIN only against dev_net(dev), so a caller privileged there but not in vxlan->net can rewrite a vxlan device whose underlay lives in vxlan->net. vxlan_changelink() validates and applies the new configuration against vxlan->net (vxlan_config_validate(vxlan->net, ...)) and can reopen the underlay socket in that netns, so the same reasoning as the tunnel changelink series applies here. Gate vxlan_changelink() with rtnl_dev_link_net_capable(), at the top of the op before any attribute is parsed, matching ipgre_changelink() and the rest of the "require CAP_NET_ADMIN in the device netns for changelink" series. Found by 0sec automated security-research tooling (https://0sec.ai).

HighCVSS 8.8 · v3.1—No exploit Fix available
Published
Aug 12, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 3th percentile

Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
8.8
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.

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  • 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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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.

—

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

    • 4.11affected
    • 8bcdc4f3a20be949df54b67e5ae2734daabb5792 and later · before b95a8743e58f7efed5ddc4cb73829b66f17feab0affected · git
    • 8bcdc4f3a20be949df54b67e5ae2734daabb5792 and later · before 7465ade989ba84adc2bfa58bad3ca25d249f0f7aaffected · git
    • 8bcdc4f3a20be949df54b67e5ae2734daabb5792 and later · before 0aa580a8bbbed2507b4582a1f0ef581d480d06edaffected · git
    • 8bcdc4f3a20be949df54b67e5ae2734daabb5792 and later · before b3793d7dccb192ffff29894d11824db6251acdd5affected · git
    • 8bcdc4f3a20be949df54b67e5ae2734daabb5792 and later · before 32d10c46bfde3e9b274e9e1bd6399d0ebea8f60faffected · git
    • 8bcdc4f3a20be949df54b67e5ae2734daabb5792 and later · before 730c7e5fea7f06e0cdf21c547222ec93234fd1d6affected · git
    • 8bcdc4f3a20be949df54b67e5ae2734daabb5792 and later · before e8ad0d311e225939a9a6c745d6cc384c7364ec87affected · git
    • 8bcdc4f3a20be949df54b67e5ae2734daabb5792 and later · before 3a61bd9637f3d929aa846e4eb3d98b48c26fcb0eaffected · git
    • before 4.11not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.63.1.el10_26.12.0-211.63.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.63.1.el10_26.12.0-211.63.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.63.1.el10_26.12.0-211.63.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.63.1.el10_26.12.0-211.63.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.63.1.el10_26.12.0-211.63.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.63.1.el10_26.12.0-211.63.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.63.1.el10_26.12.0-211.63.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.63.1.el10_26.12.0-211.63.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.63.1.el10_26.12.0-211.63.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.63.1.el10_26.12.0-211.63.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.63.1.el10_26.12.0-211.63.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.63.1.el10_26.12.0-211.63.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.63.1.el10_26.12.0-211.63.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.63.1.el10_26.12.0-211.63.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.63.1.el10_26.12.0-211.63.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.63.1.el10_26.12.0-211.63.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.63.1.el10_26.12.0-211.63.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.63.1.el10_26.12.0-211.63.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.63.1.el10_26.12.0-211.63.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.63.1.el10_26.12.0-211.63.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.63.1.el10_26.12.0-211.63.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.63.1.el10_26.12.0-211.63.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.63.1.el10_26.12.0-211.63.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.63.1.el10_26.12.0-211.63.1.el10_2

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-68449Aug 11, 2026 · ata: sata_dwc_460ex: fix infinite loop in NCQ tag completion bit-scanning
    0Monitor
  • ← EarlierCVE-2026-68450Aug 11, 2026 · btrfs: free mapping node on duplicate reloc root insert
    0Monitor
  • Later →CVE-2026-68433Aug 12, 2026 · libceph: bound get_version reply decode to front len
    34Monitor

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 Linux0aa580a8bbbed2507b4582a1f0ef581d480d06edVendor (CNA)
Linux Linux32d10c46bfde3e9b274e9e1bd6399d0ebea8f60fVendor (CNA)
Linux Linux3a61bd9637f3d929aa846e4eb3d98b48c26fcb0eVendor (CNA)
Linux Linux730c7e5fea7f06e0cdf21c547222ec93234fd1d6Vendor (CNA)
Linux Linux7465ade989ba84adc2bfa58bad3ca25d249f0f7aVendor (CNA)
Linux Linuxb3793d7dccb192ffff29894d11824db6251acdd5Vendor (CNA)
Linux Linuxb95a8743e58f7efed5ddc4cb73829b66f17feab0Vendor (CNA)
Linux Linuxe8ad0d311e225939a9a6c745d6cc384c7364ec87Vendor (CNA)
azl3 kernel 6.6.143.1-1 on Azure Linux 3.06.6.150.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:bpftool4.18.0-553.171.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel4.18.0-553.171.1.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt4.18.0-553.171.1.rt7.512.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-core4.18.0-553.171.1.rt7.512.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug4.18.0-553.171.1.rt7.512.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-core4.18.0-553.171.1.rt7.512.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-devel4.18.0-553.171.1.rt7.512.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules4.18.0-553.171.1.rt7.512.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-debug-modules-extra4.18.0-553.171.1.rt7.512.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-devel4.18.0-553.171.1.rt7.512.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules4.18.0-553.171.1.rt7.512.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:kernel-rt-modules-extra4.18.0-553.171.1.rt7.512.el8_10 · AlmaLinux:8Package registry (OSV)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.101-1~deb12u1 · Debian:12Package registry (OSV)
red hat:kernel-rt0:4.18.0-553.171.1.rt7.512.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-core0:4.18.0-553.171.1.rt7.512.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug0:4.18.0-553.171.1.rt7.512.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-core0:4.18.0-553.171.1.rt7.512.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-debuginfo0:4.18.0-553.171.1.rt7.512.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-devel0:4.18.0-553.171.1.rt7.512.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)
red hat:kernel-rt-debug-kvm0:4.18.0-553.171.1.rt7.512.el8_10 · Red Hat:enterprise_linux:8::nfvPackage registry (OSV)

+7

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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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.

  • CVE-2025-68803211 days apartNFSD: NFSv4 file creation neglects setting ACL
    32Monitor

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
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Changed
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-863 · Incorrect Authorization

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/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 (7 more)

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

All records