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NVD / CVE Program· CNA Linux

CVE-2025-40053: net: dlink: handle copy_thresh allocation failure

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: 0.62% (FIRST EPSS); higher than 50.3% of all records.
  • 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 5aa9b885602811a026a3f45c92ea2b4b04c54f09, 7ed5010fef0930f4322d620052edc854ef3ec41f, 8169a6011c5fecc6cb1c3654c541c567d3318de8; azl3 kernel 6.6.104.2-4 on Azure Linux 3.0 6.6.112.1-2.

Low priority for now. Upgrade to Linux Linux 5aa9b885602811a026a3f45c92ea2b4b04c54f09, 7ed5010fef0930f4322d620052edc854ef3ec41f, 8169a6011c5fecc6cb1c3654c541c567d3318de8; azl3 kernel 6.6.104.2-4 on Azure Linux 3.0 6.6.112.1-2 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: dlink: handle copy_thresh allocation failure The driver did not handle failure of `netdev_alloc_skb_ip_align()`. If the allocation failed, dereferencing `skb->protocol` could lead to a NULL pointer dereference. This patch tries to allocate `skb`. If the allocation fails, it falls back to the normal path. Tested-on: D-Link DGE-550T Rev-A3

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Oct 28, 2025
Updated
Oct 19, 2026
EPSS
0.6% · 50th 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 · 0.6%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

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.

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-2025-40053

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

    • 2.6.12affected
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 84fd710a704f3d53d4120e452e86cea558cf73a8affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 5aa9b885602811a026a3f45c92ea2b4b04c54f09affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 9d49e4b14609e1a20d931e718962c4b6b5485174affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before ea87151df398d407a632c7bf63013290f01c5009affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 7ed5010fef0930f4322d620052edc854ef3ec41faffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before fd7b6b2c920d7fd370a612be416a904d6e1ebe55affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 8169a6011c5fecc6cb1c3654c541c567d3318de8affected · git
    • before 2.6.12not affected · semver
    • 5.10.246 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 6.1.158-16.1.158-1
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-2025-40051Oct 28, 2025 · vhost: vringh: Modify the return value check
    31Monitor
  • ← EarlierCVE-2025-40052Oct 28, 2025 · smb: client: fix crypto buffers in non-linear memory
    0Monitor
  • Later →CVE-2025-40054Oct 28, 2025 · f2fs: fix UAF issue in f2fs_merge_page_bio()
    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 / packageFixed versionSource
Linux Linux5aa9b885602811a026a3f45c92ea2b4b04c54f09Vendor (CNA)
Linux Linux7ed5010fef0930f4322d620052edc854ef3ec41fVendor (CNA)
Linux Linux8169a6011c5fecc6cb1c3654c541c567d3318de8Vendor (CNA)
Linux Linux84fd710a704f3d53d4120e452e86cea558cf73a8Vendor (CNA)
Linux Linux9d49e4b14609e1a20d931e718962c4b6b5485174Vendor (CNA)
Linux Linuxea87151df398d407a632c7bf63013290f01c5009Vendor (CNA)
Linux Linuxfd7b6b2c920d7fd370a612be416a904d6e1ebe55Vendor (CNA)
azl3 kernel 6.6.104.2-4 on Azure Linux 3.06.6.112.1-2 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.158-1 · 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.

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 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
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. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (6 more)

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

All records