CVE-2025-38325Network attack vector

Kernel crash via cross-transport cleanup confusion

Published Jul 10, 2025 · Updated Aug 5, 2026

Type confusion in affected Linux ksmbd kernels allows remote attackers to crash the kernel via SMB Direct connection teardown. ksmbd_free_transport routes an SMB Direct connection through TCP free_transport handling, treating the RDMA transport object as a socket and causing invalid cleanup. The unauthenticated path is reachable only when ksmbd serves SMB Direct over RDMA; disconnecting can trigger a kernel oops and interrupt the host.

CVSS severity9.8
Critical
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in affected Linux ksmbd kernels allows remote attackers to crash the kernel via SMB Direct connection teardown. ksmbd_free_transport routes an SMB Direct connection through TCP free_transport handling, treating the RDMA transport object as a socket and causing invalid cleanup. The unauthenticated path is reachable only when ksmbd serves SMB Direct over RDMA; disconnecting can trigger a kernel oops and interrupt the host.

The record

CVE
CVE-2025-38325
Published
Jul 10, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 10, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=1aec4d14cf81b7b3e7b69eb1cfa94144eed7138e <3890da762a66191c440b0bd6e3ee45501edbb0c1
  2. Affected versionversion=1da8bd9a10ecd718692732294d15fd801c0eabb5 <52f5a52dc17a4a7b4363ac03fe2c4ef26f020dc6
  3. Affected versionversion=21a4e47578d44c6b37c4fc4aba8ed7cc8dbb13de <3f3aae77280aad9f5acc6709c596148966f765c7
  4. Affected versionversion=21a4e47578d44c6b37c4fc4aba8ed7cc8dbb13de <a89f5fae998bdc4d0505306f93844c9ae059d50c
  5. Affected versionversion=6.12.26 <6.12.35
  6. Affected versionversion=6.14.4 <6.15
  7. Affected versionversion=6.15
  8. Affected versionversion=e59796fc80603bcd8569d4d2e10b213c1918edb4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1aec4d14cf81b7b3e7b69eb1cfa94144eed7138e <3890da762a66191c440b0bd6e3ee45501edbb0c1; version=1da8bd9a10ecd718692732294d15fd801c0eabb5 <52f5a52dc17a4a7b4363ac03fe2c4ef26f020dc6; version=21a4e47578d44c6b37c4fc4aba8ed7cc8dbb13de <3f3aae77280aad9f5acc6709c596148966f765c7; version=21a4e47578d44c6b37c4fc4aba8ed7cc8dbb13de <a89f5fae998bdc4d0505306f93844c9ae059d50c; version=6.12.26 <6.12.35; version=6.14.4 <6.15; version=6.15; version=e59796fc80603bcd8569d4d2e10b213c1918edb4

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
9.8LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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