net: sit: require CAP_NET_ADMIN in the device netns for changelink
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.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for help- Published
- Aug 15, 2026
- Updated
- Aug 17, 2026
- EPSS
- 0.2% · 6th percentile
- CWE
- —
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Report tools
Action score
35
Monitor
Low priority for now.
- CVSS
- 35 / 40 · 8.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
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.
Affected systems
—
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.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.1.180-1 | 6.1.180-1 |
| Debian:13 | linux | before 6.12.100-1 | 6.12.100-1 |
| Debian:14 | linux | before 7.1.5-1 | 7.1.5-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation40Plan
- CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment40Plan
- CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()40Plan
- CVE-2026-74309vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler40Plan
- CVE-2026-74280crypto: marvell/octeontx - fix DMA cleanup using wrong loop index40Plan
- CVE-2026-74279crypto: cavium/cpt - fix DMA cleanup using wrong loop index40Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 27ccb68e7cccead5d8c611665a45d23032d468b3 | Vendor (CNA) |
| Linux Linux | 3118e97dae533fb45964b87bbed1801afcff7c65 | Vendor (CNA) |
| Linux Linux | 388ccffbd2e7e5e4271f291085a7451865705305 | Vendor (CNA) |
| Linux Linux | 7d139dec96691cde96cb40ed293e2d13d994fb4f | Vendor (CNA) |
| Linux Linux | 99ae3248b33df94201915d9c32e7470cdf08cfcd | Vendor (CNA) |
| Linux Linux | c0ea1aedb37bb979e864ed7787975434bbd9db73 | Vendor (CNA) |
| Linux Linux | c5a0ae895432596b2f464172da8218e2d84e2932 | Vendor (CNA) |
| Linux Linux | cb41b308e9d867725d965b291dd085028e36a480 | Vendor (CNA) |
| debian:linux | 6.1.180-1 · Debian:12 | Package 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.
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 researchersFinders, 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
- 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)
—
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
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/27ccb68e7cccead5d8c611665a45d23032d468b3
- git.kernel.org/stable/c/3118e97dae533fb45964b87bbed1801afcff7c65
- git.kernel.org/stable/c/388ccffbd2e7e5e4271f291085a7451865705305
- git.kernel.org/stable/c/7d139dec96691cde96cb40ed293e2d13d994fb4f
- git.kernel.org/stable/c/99ae3248b33df94201915d9c32e7470cdf08cfcd
- git.kernel.org/stable/c/c0ea1aedb37bb979e864ed7787975434bbd9db73
- git.kernel.org/stable/c/c5a0ae895432596b2f464172da8218e2d84e2932
- git.kernel.org/stable/c/cb41b308e9d867725d965b291dd085028e36a480
Vendor advisories and official records. Exploit/PoC links are deliberately left out.