vxlan: use neigh_ha_snapshot() in route_shortcircuit()
In the Linux kernel, the following vulnerability has been resolved: vxlan: use neigh_ha_snapshot() in route_shortcircuit() The neighbour hardware address n->ha can be updated asynchronously by the neighbour subsystem, protected by n->ha_lock seqlock. Reading n->ha without holding the seqlock loop can lead to torn reads or reading a partially updated MAC address. Use neigh_ha_snapshot() in route_shortcircuit() to safely copy n->ha under read_seqbegin()/read_seqretry() lock protection before using it. Note that arp_reduce() and neigh_reduce() seem to have the same issue left for future patches.
- Published
- Aug 15, 2026
- Updated
- Aug 19, 2026
- EPSS
- 0.5% · 37th percentile
- CWE
- —
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Report tools
Action score
40
Plan
Add it to your regular patch cycle.
- CVSS
- 40 / 40 · 10.0 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.5%
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 10.0
- 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.
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 helpAffected 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
- 3.8affected
- e4f67addf158f98f8197e08974966b18480dc751 and later · before 32a9590a8d30426e3db63e6b20893e47e02576c0affected · git
- e4f67addf158f98f8197e08974966b18480dc751 and later · before d0993fc053f29e15cc7c9fe2029df3882a2ab5abaffected · git
- e4f67addf158f98f8197e08974966b18480dc751 and later · before 87210054bad82bbae6f483a742dc45722fb47a6baffected · git
- e4f67addf158f98f8197e08974966b18480dc751 and later · before d08e8ac13f2e228cc7fc3c70b5ebe71557b624a0affected · git
- e4f67addf158f98f8197e08974966b18480dc751 and later · before ec341bb76d77b4c2948764375ee6bfeef4bb41c3affected · git
- e4f67addf158f98f8197e08974966b18480dc751 and later · before ff89415d34c3ab9f5312316423122e664ed3524faffected · git
- e4f67addf158f98f8197e08974966b18480dc751 and later · before 05f2987f73daa05333fd713d05546142f9f7c5f0affected · git
- e4f67addf158f98f8197e08974966b18480dc751 and later · before 8eca411347e1d38964f9ed2c8d3b6ab0e7e4473daffected · git
- before 3.8not 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 6.1.187-1 | 6.1.187-1 |
| Debian:12 | linux-6.12 | before 6.12.107-1~deb12u1 | 6.12.107-1~deb12u1 |
| Debian:13 | linux | before 6.12.105-1 | 6.12.105-1 |
| Debian:14 | linux | before 7.1.8-1 | 7.1.8-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
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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 | 05f2987f73daa05333fd713d05546142f9f7c5f0 | Vendor (CNA) |
| Linux Linux | 32a9590a8d30426e3db63e6b20893e47e02576c0 | Vendor (CNA) |
| Linux Linux | 87210054bad82bbae6f483a742dc45722fb47a6b | Vendor (CNA) |
| Linux Linux | 8eca411347e1d38964f9ed2c8d3b6ab0e7e4473d | Vendor (CNA) |
| Linux Linux | d08e8ac13f2e228cc7fc3c70b5ebe71557b624a0 | Vendor (CNA) |
| Linux Linux | d0993fc053f29e15cc7c9fe2029df3882a2ab5ab | Vendor (CNA) |
| Linux Linux | ec341bb76d77b4c2948764375ee6bfeef4bb41c3 | Vendor (CNA) |
| Linux Linux | ff89415d34c3ab9f5312316423122e664ed3524f | Vendor (CNA) |
| azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 | 6.6.152.1-1 · Release Notes | Microsoft (MSRC) |
| debian:linux | 6.1.187-1 · Debian:12 | Package registry (OSV) |
| debian:linux-6.12 | 6.12.107-1~deb12u1 · 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).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-26-0854 · Aug 19, 2026(Linux Kernel Güvenlik Bildirimi)
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- 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
- low · the service can be disrupted
Impact can extend beyond the vulnerable component (scope changes).
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- Low
Weakness class (CWE)
—
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L
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/05f2987f73daa05333fd713d05546142f9f7c5f0
- git.kernel.org/stable/c/32a9590a8d30426e3db63e6b20893e47e02576c0
- git.kernel.org/stable/c/87210054bad82bbae6f483a742dc45722fb47a6b
- git.kernel.org/stable/c/8eca411347e1d38964f9ed2c8d3b6ab0e7e4473d
- git.kernel.org/stable/c/d08e8ac13f2e228cc7fc3c70b5ebe71557b624a0
- git.kernel.org/stable/c/d0993fc053f29e15cc7c9fe2029df3882a2ab5ab
- git.kernel.org/stable/c/ec341bb76d77b4c2948764375ee6bfeef4bb41c3
- git.kernel.org/stable/c/ff89415d34c3ab9f5312316423122e664ed3524f
Vendor advisories and official records. Exploit/PoC links are deliberately left out.