CVE-2025-71150Network attack vector

Remote service interruption via session reference leak

Published Jan 23, 2026 · Updated Jan 23, 2026

A reference-count leak in the Linux kernel ksmbd server allows remote attackers to exhaust memory and interrupt SMB service via requests. The ksmbd_session_lookup_all function returns NULL for a session outside SMB2_SESSION_VALID without releasing the reference acquired by lookup. Exposure requires a running, network-reachable ksmbd SMB server; repeated invalid-session requests consume kernel memory until service interruption.

CVSS severity7.5
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A reference-count leak in the Linux kernel ksmbd server allows remote attackers to exhaust memory and interrupt SMB service via requests. The ksmbd_session_lookup_all function returns NULL for a session outside SMB2_SESSION_VALID without releasing the reference acquired by lookup. Exposure requires a running, network-reachable ksmbd SMB server; repeated invalid-session requests consume kernel memory until service interruption.

The record

CVE
CVE-2025-71150
Published
Jan 23, 2026
Updated
Jan 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <02e06785e85b4bd86ef3d23b7c8d87acc76773d5
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0fb87b28cafae71e9c8248432cc3a6a1fd759efc
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8cabcb4dd3dc85dd83a37d26efcc59a66a4074d7
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cafb57f7bdd57abba87725eb4e82bbdca4959644
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e54fb2a4772545701766cba08aab20de5eace8cd

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <02e06785e85b4bd86ef3d23b7c8d87acc76773d5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0fb87b28cafae71e9c8248432cc3a6a1fd759efc; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8cabcb4dd3dc85dd83a37d26efcc59a66a4074d7; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cafb57f7bdd57abba87725eb4e82bbdca4959644; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e54fb2a4772545701766cba08aab20de5eace8cd

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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