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NVD / CVE Program· CNA Linux

CVE-2025-37962: ksmbd: fix memory leak in parse_lease_state()

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: 0.19% (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 2148d34371b06dac696c0497a98a6bf905a51650, 6.1.139, 6.12.29.

Low priority for now. Upgrade to Linux Linux 2148d34371b06dac696c0497a98a6bf905a51650, 6.1.139, 6.12.29 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: ksmbd: fix memory leak in parse_lease_state() The previous patch that added bounds check for create lease context introduced a memory leak. When the bounds check fails, the function returns NULL without freeing the previously allocated lease_ctx_info structure. This patch fixes the issue by adding kfree(lreq) before returning NULL in both boundary check cases.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 20, 2025
Updated
Jun 17, 2026
EPSS
0.1% · 8th 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 · 0.1%

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.

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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 kernel6.6.87 and later · before 6.6.91
  • linux linux kernel6.12.23 and later · before 6.12.29
  • linux linux kernel6.1.134 and later · before 6.1.139
  • linux linux kernel6.14.2 and later · before 6.14.7
  • linux linux kernel6.13.11 and later · before 6.14
  • 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

    • a41cd52f00907a040ca22c73d4805bb79b0d0972affected
    • 629dd37acc336ad778979361c351e782053ea284 and later · before facf22c1a394c1e023dab5daf9a494f722771e1caffected · git
    • 60b7207893a8a06c78441934931a08fdad63f18e and later · before af9e2d4732a548db8f6f5a90c2c20a789a3d7240affected · git
    • 800c482c9ef5910f05e3a713943c67cc6c1d4939 and later · before 2148d34371b06dac696c0497a98a6bf905a51650affected · git
    • 9a1b6ea955e6c7b29939a6d98701202f9d9644ec and later · before 829e19ef741d9e9932abdc3bee5466195e0852cfaffected · git
    • bab703ed8472aa9d109c5f8c1863921533363dae and later · before eb4447bcce915b43b691123118893fca4f372a8faffected · git
    • 6.13.11 and later · before 6.14affected · semver
    • 6.1.134 and later · before 6.1.139affected · semver
    • 6.6.87 and later · before 6.6.91affected · semver
    • 6.12.23 and later · before 6.12.29affected · 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-2025-37960May 20, 2025 · memblock: Accept allocated memory before use in memblock_double_array()
    22Monitor
  • ← EarlierCVE-2025-37961May 20, 2025 · ipvs: fix uninit-value for saddr in do_output_route4
    22Monitor
  • Later →CVE-2025-37963May 20, 2025 · arm64: bpf: Only mitigate cBPF programs loaded by unprivileged users
    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 Linux2148d34371b06dac696c0497a98a6bf905a51650Vendor (CNA)
Linux Linux6.1.139Vendor (CNA)
Linux Linux6.12.29Vendor (CNA)
Linux Linux6.14Vendor (CNA)
Linux Linux6.14.7Vendor (CNA)
Linux Linux6.6.91Vendor (CNA)
Linux Linux829e19ef741d9e9932abdc3bee5466195e0852cfVendor (CNA)
Linux Linuxaf9e2d4732a548db8f6f5a90c2c20a789a3d7240Vendor (CNA)
Linux Linuxeb4447bcce915b43b691123118893fca4f372a8fVendor (CNA)
Linux Linuxfacf22c1a394c1e023dab5daf9a494f722771e1cVendor (CNA)
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 (5 more)

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

All records