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CVE-2026-72061· NVD / CVE Program· CNA Linux

net: sit: 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: 0.15% (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 27ccb68e7cccead5d8c611665a45d23032d468b3, 3118e97dae533fb45964b87bbed1801afcff7c65, 388ccffbd2e7e5e4271f291085a7451865705305.

Low priority for now. Upgrade to Linux Linux 27ccb68e7cccead5d8c611665a45d23032d468b3, 3118e97dae533fb45964b87bbed1801afcff7c65, 388ccffbd2e7e5e4271f291085a7451865705305 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: net: sit: require CAP_NET_ADMIN in the device netns for changelink ipip6_changelink() operates on at most two netns, dev_net(dev) and the tunnel link netns t->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 t->net can rewrite a tunnel that lives in t->net. Gate ipip6_changelink() on rtnl_dev_link_net_capable() at its top, before any attribute is parsed. sit was the one tunnel type not covered by the recent series that added this check to the other changelink() handlers.

HighCVSS 8.8 · v3.1—No exploit Fix available
Published
Aug 15, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 4th 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.

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-2026-72061

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.

—

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

    • 3.11affected
    • 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 and later · before cb41b308e9d867725d965b291dd085028e36a480affected · git
    • 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 and later · before c5a0ae895432596b2f464172da8218e2d84e2932affected · git
    • 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 and later · before 7d139dec96691cde96cb40ed293e2d13d994fb4faffected · git
    • 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 and later · before 388ccffbd2e7e5e4271f291085a7451865705305affected · git
    • 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 and later · before c0ea1aedb37bb979e864ed7787975434bbd9db73affected · git
    • 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 and later · before 3118e97dae533fb45964b87bbed1801afcff7c65affected · git
    • 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 and later · before 99ae3248b33df94201915d9c32e7470cdf08cfcdaffected · git
    • 5e6700b3bf98fe98d630bf9c939ad4c85ce95592 and later · before 27ccb68e7cccead5d8c611665a45d23032d468b3affected · git
    • before 3.11not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.180-16.1.180-1
Debian:13linuxbefore 6.12.100-16.12.100-1
Debian:14linuxbefore 7.1.5-17.1.5-1

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-2026-72055Aug 15, 2026 · net: ip6_vti: require CAP_NET_ADMIN in the device netns for changelink
    35Monitor
  • ← EarlierCVE-2026-72057Aug 15, 2026 · net/sched: act_ct: preserve tc_skb_cb across defragmentation
    32Monitor
  • Later →CVE-2026-72064Aug 15, 2026 · net: mana: Sync page pool RX frags for CPU
    39Monitor

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 Linux27ccb68e7cccead5d8c611665a45d23032d468b3Vendor (CNA)
Linux Linux3118e97dae533fb45964b87bbed1801afcff7c65Vendor (CNA)
Linux Linux388ccffbd2e7e5e4271f291085a7451865705305Vendor (CNA)
Linux Linux7d139dec96691cde96cb40ed293e2d13d994fb4fVendor (CNA)
Linux Linux99ae3248b33df94201915d9c32e7470cdf08cfcdVendor (CNA)
Linux Linuxc0ea1aedb37bb979e864ed7787975434bbd9db73Vendor (CNA)
Linux Linuxc5a0ae895432596b2f464172da8218e2d84e2932Vendor (CNA)
Linux Linuxcb41b308e9d867725d965b291dd085028e36a480Vendor (CNA)
debian:linux6.1.180-1 · 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.

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-2026-720450 days apartocteontx2-af: cn10k: restrict VF LMTLINE sharing to its own PF
    35Monitor
  • CVE-2026-720510 days apartnet: ip6_tunnel: require CAP_NET_ADMIN in the device netns for changelink
    35Monitor
  • CVE-2026-720520 days apartnet: ip6_gre: require CAP_NET_ADMIN in the device netns for changelink
    35Monitor
  • CVE-2026-720530 days apartnet: ipip: require CAP_NET_ADMIN in the device netns for changelink
    35Monitor
  • CVE-2026-720540 days apartnet: ip_vti: require CAP_NET_ADMIN in the device netns for changelink
    35Monitor
  • CVE-2026-720550 days apartnet: ip6_vti: require CAP_NET_ADMIN in the device netns for changelink
    35Monitor

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-862 · Missing 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.

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