CVE-2025-37962

Service interruption via leaked lease contexts

Published May 20, 2025 · Updated May 23, 2026

Memory leak in the Linux kernel ksmbd parser allows local users to consume kernel memory through malformed SMB lease contexts. In parse_lease_state(), either failed boundary check returns NULL without freeing the previously allocated lease_ctx_info structure. Low-privilege local access and an affected kernel with ksmbd lease processing are required; repeated failures can deplete memory and interrupt service.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in the Linux kernel ksmbd parser allows local users to consume kernel memory through malformed SMB lease contexts. In parse_lease_state(), either failed boundary check returns NULL without freeing the previously allocated lease_ctx_info structure. Low-privilege local access and an affected kernel with ksmbd lease processing are required; repeated failures can deplete memory and interrupt service.

The record

CVE
CVE-2025-37962
Published
May 20, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 20, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=60b7207893a8a06c78441934931a08fdad63f18e <af9e2d4732a548db8f6f5a90c2c20a789a3d7240
  2. Affected versionversion=6.1.134 <6.1.139
  3. Affected versionversion=6.12.23 <6.12.29
  4. Affected versionversion=6.13.11 <6.14
  5. Affected versionversion=6.14.2 <6.14.7
  6. Affected versionversion=629dd37acc336ad778979361c351e782053ea284 <facf22c1a394c1e023dab5daf9a494f722771e1c
  7. Affected versionversion=6.6.87 <6.6.91
  8. Affected versionversion=800c482c9ef5910f05e3a713943c67cc6c1d4939 <2148d34371b06dac696c0497a98a6bf905a51650
  9. Affected versionversion=9a1b6ea955e6c7b29939a6d98701202f9d9644ec <829e19ef741d9e9932abdc3bee5466195e0852cf
  10. Affected versionversion=a41cd52f00907a040ca22c73d4805bb79b0d0972
  11. Affected versionversion=bab703ed8472aa9d109c5f8c1863921533363dae <eb4447bcce915b43b691123118893fca4f372a8f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=60b7207893a8a06c78441934931a08fdad63f18e <af9e2d4732a548db8f6f5a90c2c20a789a3d7240; version=6.1.134 <6.1.139; version=6.12.23 <6.12.29; version=6.13.11 <6.14; version=6.14.2 <6.14.7; version=629dd37acc336ad778979361c351e782053ea284 <facf22c1a394c1e023dab5daf9a494f722771e1c; version=6.6.87 <6.6.91; version=800c482c9ef5910f05e3a713943c67cc6c1d4939 <2148d34371b06dac696c0497a98a6bf905a51650; version=9a1b6ea955e6c7b29939a6d98701202f9d9644ec <829e19ef741d9e9932abdc3bee5466195e0852cf; version=a41cd52f00907a040ca22c73d4805bb79b0d0972; version=bab703ed8472aa9d109c5f8c1863921533363dae <eb4447bcce915b43b691123118893fca4f372a8f

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499.001OS Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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