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NVD / CVE Program· CNA Linux

CVE-2025-68191: udp_tunnel: use netdev_warn() instead of netdev_WARN()

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.20% (FIRST EPSS).
  • Fixed version: Linux Linux 087f1ed450dc6e7e49ffbbbe5b78be1218c6d5e0, 3c3b148bf8384c8a787753cf20abde1c5731f97f, 45e4e4a8772fa1c5f6f38e82b732b3a9d8137af4.

Low priority for now. Upgrade to Linux Linux 087f1ed450dc6e7e49ffbbbe5b78be1218c6d5e0, 3c3b148bf8384c8a787753cf20abde1c5731f97f, 45e4e4a8772fa1c5f6f38e82b732b3a9d8137af4 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: udp_tunnel: use netdev_warn() instead of netdev_WARN() netdev_WARN() uses WARN/WARN_ON to print a backtrace along with file and line information. In this case, udp_tunnel_nic_register() returning an error is just a failed operation, not a kernel bug. udp_tunnel_nic_register() can fail due to a memory allocation failure (kzalloc() or udp_tunnel_nic_alloc()). This is a normal runtime error and not a kernel bug. Replace netdev_WARN() with netdev_warn() accordingly.

—No exploit Fix available
Published
Dec 16, 2025
Updated
Oct 14, 2026
EPSS
0.2% · 10th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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

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  • when exploit code appears or is weaponized
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  • 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

    • 5.9affected
    • cc4e3835eff474aa274d6e1d18f69d9d296d3b76 and later · before 087f1ed450dc6e7e49ffbbbe5b78be1218c6d5e0affected · git
    • cc4e3835eff474aa274d6e1d18f69d9d296d3b76 and later · before 45e4e4a8772fa1c5f6f38e82b732b3a9d8137af4affected · git
    • cc4e3835eff474aa274d6e1d18f69d9d296d3b76 and later · before 7758ec35ff3e9a31558eda4f0f9eb0ddfa78a8baaffected · git
    • cc4e3835eff474aa274d6e1d18f69d9d296d3b76 and later · before c018a87942bf1607aeebf8dba5a210ca9a09a0fdaffected · git
    • cc4e3835eff474aa274d6e1d18f69d9d296d3b76 and later · before 51b3033088f0420b19027e3d54cd989b6ebd987eaffected · git
    • cc4e3835eff474aa274d6e1d18f69d9d296d3b76 and later · before 3c3b148bf8384c8a787753cf20abde1c5731f97faffected · git
    • cc4e3835eff474aa274d6e1d18f69d9d296d3b76 and later · before dc2f650f7e6857bf384069c1a56b2937a1ee370daffected · git
    • before 5.9not affected · semver
    • 5.10.247 and later · up to and including 5.10.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.159-16.1.159-1
Debian:13linuxbefore 6.12.63-16.12.63-1
Debian:14linuxbefore 6.17.8-16.17.8-1

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-2025-68189Dec 16, 2025 · drm/msm: Fix GEM free for imported dma-bufs
    31Monitor
  • ← EarlierCVE-2025-68190Dec 16, 2025 · drm/amdgpu/atom: Check kcalloc() for WS buffer in amdgpu_atom_execute_table_locked()
    0Monitor
  • Later →CVE-2025-68192Dec 16, 2025 · net: usb: qmi_wwan: initialize MAC header offset in qmimux_rx_fixup
    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 Linux087f1ed450dc6e7e49ffbbbe5b78be1218c6d5e0Vendor (CNA)
Linux Linux3c3b148bf8384c8a787753cf20abde1c5731f97fVendor (CNA)
Linux Linux45e4e4a8772fa1c5f6f38e82b732b3a9d8137af4Vendor (CNA)
Linux Linux51b3033088f0420b19027e3d54cd989b6ebd987eVendor (CNA)
Linux Linux7758ec35ff3e9a31558eda4f0f9eb0ddfa78a8baVendor (CNA)
Linux Linuxc018a87942bf1607aeebf8dba5a210ca9a09a0fdVendor (CNA)
Linux Linuxdc2f650f7e6857bf384069c1a56b2937a1ee370dVendor (CNA)
debian:linux6.1.159-1 · 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

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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. Fix✗ → ✓

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References

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records