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NVD / CVE Program· CNA Linux

CVE-2026-74406: vxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive().

Noroxi assessment

Priority: Monitor (action score 39/100)

  • 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: 0.51% (FIRST EPSS).
  • 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.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Linux Linux 022af89207fcc992ec5c712c14e2e018c335eb1e, 08f40c0d23c67c3aa4224c3311e134999c721fb4, 30a45c0bffdd62350261e2f2689fdba426a33578.

Low priority for now. Upgrade to Linux Linux 022af89207fcc992ec5c712c14e2e018c335eb1e, 08f40c0d23c67c3aa4224c3311e134999c721fb4, 30a45c0bffdd62350261e2f2689fdba426a33578 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: Fix potential null-ptr-deref in vxlan_gro_prepare_receive(). udp_tunnel_sock_release() could set sk->sk_user_data to NULL while vxlan_gro_prepare_receive() is running. Let's check if rcu_dereference_sk_user_data() is NULL after skb_gro_remcsum_init().

CriticalCVSS 9.8 · v3.1—No exploit Fix available
Published
Aug 15, 2026
Updated
Oct 30, 2026
EPSS
0.5% · 44th percentile
CWE
—

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
9.8
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-2026-74406

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

    • 4.7affected
    • 5602c48cf87562c2f95b831d690631935e834295 and later · before 022af89207fcc992ec5c712c14e2e018c335eb1eaffected · git
    • 5602c48cf87562c2f95b831d690631935e834295 and later · before a3104cc1fed994519538301efcaab175f9af6008affected · git
    • 5602c48cf87562c2f95b831d690631935e834295 and later · before 9c58c729d32e7cea5772cc44929c6cd61e5a31cdaffected · git
    • 5602c48cf87562c2f95b831d690631935e834295 and later · before f79c80f173fda9545b220c1f094b65fc06c252d0affected · git
    • 5602c48cf87562c2f95b831d690631935e834295 and later · before 08f40c0d23c67c3aa4224c3311e134999c721fb4affected · git
    • 5602c48cf87562c2f95b831d690631935e834295 and later · before 4a8cde6f7281ea2c4c290f9ad9923b3631defcebaffected · git
    • 5602c48cf87562c2f95b831d690631935e834295 and later · before ef44dac2a37f86eeae6b88ed10a6d60b35387dfdaffected · git
    • 5602c48cf87562c2f95b831d690631935e834295 and later · before 30a45c0bffdd62350261e2f2689fdba426a33578affected · git
    • before 4.7not 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-2026-74404Aug 15, 2026 · crypto: ccp - Fix snp_filter_reserved_mem_regions() off-by-one
    31Monitor
  • ← EarlierCVE-2026-74405Aug 15, 2026 · OPP: Fix race between OPP addition and lookup
    31Monitor
  • Later →CVE-2026-74407Aug 15, 2026 · wifi: ath11k: cancel SSR work items during PCI shutdown
    35Monitor

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 Linux022af89207fcc992ec5c712c14e2e018c335eb1eVendor (CNA)
Linux Linux08f40c0d23c67c3aa4224c3311e134999c721fb4Vendor (CNA)
Linux Linux30a45c0bffdd62350261e2f2689fdba426a33578Vendor (CNA)
Linux Linux4a8cde6f7281ea2c4c290f9ad9923b3631defcebVendor (CNA)
Linux Linux9c58c729d32e7cea5772cc44929c6cd61e5a31cdVendor (CNA)
Linux Linuxa3104cc1fed994519538301efcaab175f9af6008Vendor (CNA)
Linux Linuxef44dac2a37f86eeae6b88ed10a6d60b35387dfdVendor (CNA)
Linux Linuxf79c80f173fda9545b220c1f094b65fc06c252d0Vendor (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.

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

  • 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
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/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

  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