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NVD / CVE Program· CNA Linux

CVE-2025-40347: net: enetc: fix the deadlock of enetc_mdio_lock

Noroxi assessment

Priority: Monitor (action score 30/100)

  • 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: 0.52% (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.
  • Fixed version: Linux Linux 1f92f5bd057a4fad9dab6af17963cdd21e5da6ed, 2781ca82ce8cad263d80b617addb727e6a84c9e5, 2e55a49dc3b2a6b23329e4fbbd8a5feb20e220aa.

Low priority for now. Upgrade to Linux Linux 1f92f5bd057a4fad9dab6af17963cdd21e5da6ed, 2781ca82ce8cad263d80b617addb727e6a84c9e5, 2e55a49dc3b2a6b23329e4fbbd8a5feb20e220aa 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: net: enetc: fix the deadlock of enetc_mdio_lock After applying the workaround for err050089, the LS1028A platform experiences RCU stalls on RT kernel. This issue is caused by the recursive acquisition of the read lock enetc_mdio_lock. Here list some of the call stacks identified under the enetc_poll path that may lead to a deadlock: enetc_poll -> enetc_lock_mdio -> enetc_clean_rx_ring OR napi_complete_done -> napi_gro_receive -> enetc_start_xmit -> enetc_lock_mdio -> enetc_map_tx_buffs -> enetc_unlock_mdio -> enetc_unlock_mdio After enetc_poll acquires the read lock, a higher-priority writer attempts to acquire the lock, causing preemption. The writer detects that a read lock is already held and is scheduled out. However, readers under enetc_poll cannot acquire the read lock again because a writer is already waiting, leading to a thread hang. Currently, the deadlock is avoided by adjusting enetc_lock_mdio to prevent recursive lock acquisition.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Dec 16, 2025
Updated
Oct 14, 2026
EPSS
0.5% · 44th percentile
CWE
—

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CNA vs NVD score

NVD
—
CNA · Linux
7.5
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.

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  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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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.

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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

    • bf9c564716a13dde6a990d3b02c27cd6e39608bf, ff966263f5f9fdf9740f03fed0762ce73c230a6a, 5.12affected
    • 6d36ecdbc4410e61a0e02adc5d3abeee22a8ffd3 and later · before a649161526736f48bcc592e3a412e5bcd7dd9e24affected · git
    • 6d36ecdbc4410e61a0e02adc5d3abeee22a8ffd3 and later · before 2781ca82ce8cad263d80b617addb727e6a84c9e5affected · git
    • 6d36ecdbc4410e61a0e02adc5d3abeee22a8ffd3 and later · before 1f92f5bd057a4fad9dab6af17963cdd21e5da6edaffected · git
    • 6d36ecdbc4410e61a0e02adc5d3abeee22a8ffd3 and later · before 2e55a49dc3b2a6b23329e4fbbd8a5feb20e220aaaffected · git
    • 6d36ecdbc4410e61a0e02adc5d3abeee22a8ffd3 and later · before 50bd33f6b3922a6b760aa30d409cae891cec8fb5affected · git
    • 5.10.24 and later · before 5.11affected · semver
    • 5.11.7 and later · before 5.12affected · semver
    • before 5.12not affected · semver
    • 6.1.175 and later · up to and including 6.1.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
Debian:13linuxbefore 6.12.57-16.12.57-1
Debian:14linuxbefore 6.17.6-16.17.6-1

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-2025-68310Dec 16, 2025 · s390/pci: Avoid deadlock between PCI error recovery and mlx5 crdump
    0Monitor
  • ← EarlierCVE-2025-40346Dec 16, 2025 · arch_topology: Fix incorrect error check in topology_parse_cpu_capacity()
    0Monitor
  • Later →CVE-2025-40348Dec 16, 2025 · slab: Avoid race on slab->obj_exts in alloc_slab_obj_exts
    0Monitor

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 Linux1f92f5bd057a4fad9dab6af17963cdd21e5da6edVendor (CNA)
Linux Linux2781ca82ce8cad263d80b617addb727e6a84c9e5Vendor (CNA)
Linux Linux2e55a49dc3b2a6b23329e4fbbd8a5feb20e220aaVendor (CNA)
Linux Linux5.11Vendor (CNA)
Linux Linux5.12Vendor (CNA)
Linux Linux50bd33f6b3922a6b760aa30d409cae891cec8fb5Vendor (CNA)
Linux Linuxa649161526736f48bcc592e3a412e5bcd7dd9e24Vendor (CNA)
debian:linux6.1.176-1 · 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.

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

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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. Fix✗ → ✓

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References

Show all references (4 more)

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

All records