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NVD / CVE Program· CNA Linux

CVE-2025-37909: net: lan743x: Fix memleak issue when GSO enabled

Noroxi assessment

Priority: Monitor (action score 22/100)

  • 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: 0.23% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 093855ce90177488eac772de4eefbb909033ce5f, 189b05f189cac9fd233ef04d31cb5078c4d09c39, 2d52e2e38b85c8b7bc00dca55c2499f46f8c8198; azl3 kernel 6.6.85.1-4 on Azure Linux 3.0 6.6.92.2-1; azl3 kernel 6.6.92.2-1 on Azure Linux 3.0 6.6.92.2-1.

Low priority for now. Upgrade to Linux Linux 093855ce90177488eac772de4eefbb909033ce5f, 189b05f189cac9fd233ef04d31cb5078c4d09c39, 2d52e2e38b85c8b7bc00dca55c2499f46f8c8198; azl3 kernel 6.6.85.1-4 on Azure Linux 3.0 6.6.92.2-1; azl3 kernel 6.6.92.2-1 on Azure Linux 3.0 6.6.92.2-1 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: lan743x: Fix memleak issue when GSO enabled Always map the `skb` to the LS descriptor. Previously skb was mapped to EXT descriptor when the number of fragments is zero with GSO enabled. Mapping the skb to EXT descriptor prevents it from being freed, leading to a memory leak

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 20, 2025
Updated
Oct 15, 2026
EPSS
0.2% · 13th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2025-37909

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.

VendorProduct
linuxlinux kernel
debiandebian linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux11.0
  • linux linux kernel5.5 and later · before 5.10.238
  • linux linux kernel5.11 and later · before 5.15.182
  • linux linux kernel5.16 and later · before 6.1.138
  • linux linux kernel4.17 and later · before 5.4.294
  • linux linux kernel6.7 and later · before 6.12.28
  • linux linux kernel6.13 and later · before 6.14.6
  • linux linux kernel6.2 and later · before 6.6.90
  • linux linux kernel6.15

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

    • 4.17affected
    • 23f0703c125be490f70501b6b24ed5645775c56a and later · before 093855ce90177488eac772de4eefbb909033ce5faffected · git
    • 23f0703c125be490f70501b6b24ed5645775c56a and later · before 6c65ee5ad632eb8dcd3a91cf5dc99b22535f44d9affected · git
    • 23f0703c125be490f70501b6b24ed5645775c56a and later · before df993daa4c968b4b23078eacc248f6502ede8664affected · git
    • 23f0703c125be490f70501b6b24ed5645775c56a and later · before a0e0efbabbbe6a1859bc31bf65237ce91e124b9baffected · git
    • 23f0703c125be490f70501b6b24ed5645775c56a and later · before dae1ce27ceaea7e1522025b15252e3cc52802622affected · git
    • 23f0703c125be490f70501b6b24ed5645775c56a and later · before 189b05f189cac9fd233ef04d31cb5078c4d09c39affected · git
    • 23f0703c125be490f70501b6b24ed5645775c56a and later · before f42c18e2f14c1b1fdd2a5250069a84bc854c398caffected · git
    • 23f0703c125be490f70501b6b24ed5645775c56a and later · before 2d52e2e38b85c8b7bc00dca55c2499f46f8c8198affected · git
    • before 4.17not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.140-16.1.140-1
Debian:13linuxbefore 6.12.29-16.12.29-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2025-37906May 20, 2025 · ublk: fix race between io_uring_cmd_complete_in_task and ublk_cancel_cmd
    18Monitor
  • ← EarlierCVE-2025-37907May 20, 2025 · accel/ivpu: Fix locking order in ivpu_job_submit
    22Monitor
  • Later →CVE-2025-37911May 20, 2025 · bnxt_en: Fix out-of-bound memcpy() during ethtool -w
    22Monitor

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 Linux093855ce90177488eac772de4eefbb909033ce5fVendor (CNA)
Linux Linux189b05f189cac9fd233ef04d31cb5078c4d09c39Vendor (CNA)
Linux Linux2d52e2e38b85c8b7bc00dca55c2499f46f8c8198Vendor (CNA)
Linux Linux6c65ee5ad632eb8dcd3a91cf5dc99b22535f44d9Vendor (CNA)
Linux Linuxa0e0efbabbbe6a1859bc31bf65237ce91e124b9bVendor (CNA)
Linux Linuxdae1ce27ceaea7e1522025b15252e3cc52802622Vendor (CNA)
Linux Linuxdf993daa4c968b4b23078eacc248f6502ede8664Vendor (CNA)
Linux Linuxf42c18e2f14c1b1fdd2a5250069a84bc854c398cVendor (CNA)
azl3 kernel 6.6.85.1-4 on Azure Linux 3.06.6.92.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 kernel 6.6.92.2-1 on Azure Linux 3.06.6.92.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.140-1 · 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

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • 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
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-401 · Missing Release of Memory after Effective Lifetime

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

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✗ → ✓

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

References

Show all references (11 more)

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

All records