CVE-2026-52909: ip6_vti: set netns_immutable on the fallback device.
Noroxi assessment
Priority: Monitor (action score 31/100)
- 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 12acc977838c943636fb01e2f3087d2e4cc3b7cc, 12c65e2c7fef507551bd7b52123598a761662c01, 7f28e3948c59481f8db9c9638e204258d26b4e41; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.144.1-1.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to Linux Linux 12acc977838c943636fb01e2f3087d2e4cc3b7cc, 12c65e2c7fef507551bd7b52123598a761662c01, 7f28e3948c59481f8db9c9638e204258d26b4e41; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.144.1-1 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: ip6_vti: set netns_immutable on the fallback device. john1988 and Noam Rathaus reported that vti6_init_net() does not set the netns_immutable flag on the per-netns fallback tunnel device (ip6_vti0). Other similar tunnel drivers (like ip6_tunnel, sit, ip6_gre, and ip_tunnel) correctly set this flag during their fallback device initialization to prevent them from being moved to another network namespace.
- BDU:2026-13895
- SUSE-SU-2026:22598-1
- SUSE-SU-2026:22672-1
- SUSE-SU-2026:22678-1
- SUSE-SU-2026:22679-1
- SUSE-SU-2026:22684-1
- SUSE-SU-2026:22685-1
- SUSE-SU-2026:22686-1
- SUSE-SU-2026:22687-1
- SUSE-SU-2026:22692-1
- SUSE-SU-2026:22693-1
- SUSE-SU-2026:22694-1
- SUSE-SU-2026:22695-1
- SUSE-SU-2026:22697-1
- SUSE-SU-2026:22698-1
- SUSE-SU-2026:22710-1
- SUSE-SU-2026:22714-1
- SUSE-SU-2026:22715-1
- SUSE-SU-2026:22716-1
- SUSE-SU-2026:22717-1
- Published
- Jun 19, 2026
- Updated
- Oct 19, 2026
- EPSS
- 0.1% · 1th percentile
- CWE
- CWE-863
Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 31 / 40 · 7.8 / 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
- 7.8
- 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.
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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.
We use this product, ask for helpAffected 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.
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel3.15 and later · before 5.10.260
- linux linux kernel5.11 and later · before 5.15.211
- linux linux kernel5.16 and later · before 6.1.177
- linux linux kernel6.2 and later · before 6.6.144
- linux linux kernel6.7 and later · before 6.12.95
- linux linux kernel6.13 and later · before 6.18.36
- linux linux kernel6.19 and later · before 7.0.13
- linux linux kernel7.1
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
- 3.15affected
- 61220ab349485d911083d0b7990ccd3db6c63297 and later · before 12acc977838c943636fb01e2f3087d2e4cc3b7ccaffected · git
- 61220ab349485d911083d0b7990ccd3db6c63297 and later · before 7f28e3948c59481f8db9c9638e204258d26b4e41affected · git
- 61220ab349485d911083d0b7990ccd3db6c63297 and later · before 12c65e2c7fef507551bd7b52123598a761662c01affected · git
- 61220ab349485d911083d0b7990ccd3db6c63297 and later · before f4b6b4af7ef0661ac153c6f7eb1030aa8482c1a3affected · git
- 61220ab349485d911083d0b7990ccd3db6c63297 and later · before c5dbd669db5a426b3025512322e1bf2cdbe14305affected · git
- 61220ab349485d911083d0b7990ccd3db6c63297 and later · before ecf8904067dcba0dad86ece80874841e60317885affected · git
- 61220ab349485d911083d0b7990ccd3db6c63297 and later · before dcdce3bc9f08026ff3739ee7339e1bef526fc5f3affected · git
- 61220ab349485d911083d0b7990ccd3db6c63297 and later · before d289d5307762d1838aaece22c6b6fcad9e8865f9affected · git
- before 3.15not 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 6.1.176-1 | 6.1.176-1 |
| Debian:13 | linux | before 6.12.94-1 | 6.12.94-1 |
| Debian:14 | linux | before 7.0.13-1 | 7.0.13-1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-64kb | before 5.14.21-150400.24.228.1 | 5.14.21-150400.24.228.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-docs | before 5.14.21-150400.24.228.1 | 5.14.21-150400.24.228.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-obs-build | before 5.14.21-150400.24.228.1 | 5.14.21-150400.24.228.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-syms | before 5.14.21-150400.24.228.1 | 5.14.21-150400.24.228.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-64kb | before 5.14.21-150500.55.177.1 | 5.14.21-150500.55.177.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-docs | before 5.14.21-150500.55.177.1 | 5.14.21-150500.55.177.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-obs-build | before 5.14.21-150500.55.177.1 | 5.14.21-150500.55.177.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-syms | before 5.14.21-150500.55.177.1 | 5.14.21-150500.55.177.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_41 | before 21-150400.2.1 | 21-150400.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_43 | before 17-150400.2.1 | 17-150400.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_44 | before 16-150400.2.1 | 16-150400.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_45 | before 14-150400.2.1 | 14-150400.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_46 | before 10-150400.2.1 | 10-150400.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_49 | before 6-150400.2.1 | 6-150400.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_51 | before 5-150400.2.1 | 5-150400.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_52 | before 4-150400.2.1 | 4-150400.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_54 | before 2-150400.2.1 | 2-150400.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_55 | before 2-150400.2.1 | 2-150400.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_56 | before 2-150400.2.1 | 2-150400.2.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_57 | before 1-150400.9.3.1 | 1-150400.9.3.1 |
| SUSE:Linux Enterprise Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_40 | before 2-150500.2.2 | 2-150500.2.2 |
+67
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV90Now
- 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 KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
Published before and after this one in the same product
- ← EarlierCVE-2026-46331Jun 16, 2026 · net/sched: fix pedit partial COW leading to page cache corruption31Monitor
- ← EarlierCVE-2026-52908Jun 19, 2026 · RDMA: During rereg_mr ensure that REREG_ACCESS is compatible31Monitor
- Later →CVE-2026-52910Jun 19, 2026 · bpf: Free reuseport cBPF prog after RCU grace period.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 / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 12acc977838c943636fb01e2f3087d2e4cc3b7cc | Vendor (CNA) |
| Linux Linux | 12c65e2c7fef507551bd7b52123598a761662c01 | Vendor (CNA) |
| Linux Linux | 7f28e3948c59481f8db9c9638e204258d26b4e41 | Vendor (CNA) |
| Linux Linux | c5dbd669db5a426b3025512322e1bf2cdbe14305 | Vendor (CNA) |
| Linux Linux | d289d5307762d1838aaece22c6b6fcad9e8865f9 | Vendor (CNA) |
| Linux Linux | dcdce3bc9f08026ff3739ee7339e1bef526fc5f3 | Vendor (CNA) |
| Linux Linux | ecf8904067dcba0dad86ece80874841e60317885 | Vendor (CNA) |
| Linux Linux | f4b6b4af7ef0661ac153c6f7eb1030aa8482c1a3 | Vendor (CNA) |
| azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 | 6.6.144.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| debian:linux | 6.1.176-1 · Debian:12 | Package registry (OSV) |
| suse:kernel-livepatch-MICRO-6-0_Update_18 | 6-1.1 · SUSE:Linux Micro 6.1 | Package registry (OSV) |
| suse:kernel-livepatch-MICRO-6-0_Update_19 | 4-1.1 · SUSE:Linux Micro 6.1 | Package registry (OSV) |
| suse:kernel-livepatch-MICRO-6-0_Update_20 | 3-1.1 · SUSE:Linux Micro 6.1 | Package registry (OSV) |
| suse:kernel-livepatch-MICRO-6-0_Update_21 | 3-1.1 · SUSE:Linux Micro 6.1 | Package registry (OSV) |
| suse:kernel-livepatch-MICRO-6-0_Update_22 | 3-1.1 · SUSE:Linux Micro 6.1 | Package registry (OSV) |
| suse:kernel-livepatch-MICRO-6-0_Update_23 | 3-1.1 · SUSE:Linux Micro 6.1 | Package registry (OSV) |
| suse:kernel-livepatch-MICRO-6-0_Update_24 | 2-1.1 · SUSE:Linux Micro 6.1 | Package registry (OSV) |
| suse:kernel-livepatch-MICRO-6-0-RT_Update_19 | 6-1.1 · SUSE:Linux Micro 6.1 | Package registry (OSV) |
| suse:kernel-livepatch-MICRO-6-0-RT_Update_20 | 4-1.1 · SUSE:Linux Micro 6.1 | Package registry (OSV) |
| suse:kernel-livepatch-MICRO-6-0-RT_Update_21 | 3-1.1 · SUSE:Linux Micro 6.1 | Package registry (OSV) |
| suse:kernel-livepatch-MICRO-6-0-RT_Update_22 | 3-1.2 · SUSE:Linux Micro 6.1 | Package registry (OSV) |
| suse:kernel-livepatch-SLE16-RT_Update_9 | 4-160000.1.1 · SUSE:Linux Micro 6.2 | 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.
No history yet (it accumulates with the daily EPSS job).
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.
- CVE-2026-6383030 days apartnet: skmsg: preserve sg.copy across SG transforms37Monitor
- CVE-2026-530755 days apartppp: require CAP_NET_ADMIN in target netns for unattached ioctls35Monitor
- CVE-2026-4333442 days apartBluetooth: SMP: force responder MITM requirements before building the pairing response35Monitor
- CVE-2026-4607623 days apartKVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L131Monitor
- CVE-2026-4615022 days apartfanotify: fix false positive on permission events28Monitor
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).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-26-0423 · Jun 22, 2026(Linux Kernel Güvenlik Bildirimi)
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
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-863 · Incorrect AuthorizationCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/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
- SSVC exploitation— → none
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (8 more)Show less
- git.kernel.org/stable/c/12c65e2c7fef507551bd7b52123598a761662c01
- git.kernel.org/stable/c/7f28e3948c59481f8db9c9638e204258d26b4e41
- git.kernel.org/stable/c/c5dbd669db5a426b3025512322e1bf2cdbe14305
- git.kernel.org/stable/c/d289d5307762d1838aaece22c6b6fcad9e8865f9
- git.kernel.org/stable/c/dcdce3bc9f08026ff3739ee7339e1bef526fc5f3
- git.kernel.org/stable/c/ecf8904067dcba0dad86ece80874841e60317885
- git.kernel.org/stable/c/f4b6b4af7ef0661ac153c6f7eb1030aa8482c1a3
- cert-portal.siemens.com/productcert/html/ssa-784472.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.