CVE-2025-37750Network attack vector

Kernel memory corruption via shared AEAD transform

Published May 1, 2025 · Updated Aug 5, 2026

Use-after-free in affected Linux kernel SMB clients allows remote attackers to corrupt kernel memory via encrypted SMB3 multichannel responses. Concurrent cifsd threads reuse the primary channel's AEAD transform and race while setting keys during synchronous decryption, leaving GHASH state freed while another thread reads it. Reachability requires an encrypted SMB 3.1.1 multichannel mount; a malicious SMB server can time responses across channels to trigger kernel memory corruption and a system crash.

CVSS severity9.8
Critical
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in affected Linux kernel SMB clients allows remote attackers to corrupt kernel memory via encrypted SMB3 multichannel responses. Concurrent cifsd threads reuse the primary channel's AEAD transform and race while setting keys during synchronous decryption, leaving GHASH state freed while another thread reads it. Reachability requires an encrypted SMB 3.1.1 multichannel mount; a malicious SMB server can time responses across channels to trigger kernel memory corruption and a system crash.

The record

CVE
CVE-2025-37750
Published
May 1, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 1, 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

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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=0809fb86ad13b29e1d6d491364fc7ea4fb545995
  2. Affected versionversion=5.10.237 <5.11
  3. Affected versionversion=5.15.181 <5.16
  4. Affected versionversion=538c26d9bf70c90edc460d18c81008a4e555925a
  5. Affected versionversion=6.1.128 <6.2
  6. Affected versionversion=6.11.4 <6.12
  7. Affected versionversion=6.12
  8. Affected versionversion=6.6.57 <6.7
  9. Affected versionversion=8f14a476abba13144df5434871a7225fd29af633
  10. Affected versionversion=b0abcd65ec545701b8793e12bc27dc98042b151a <9502dd5c7029902f4a425bf959917a5a9e7c0e50
  11. Affected versionversion=b0abcd65ec545701b8793e12bc27dc98042b151a <950557922c1298464749c216d8763e97faf5d0a6
  12. Affected versionversion=b0abcd65ec545701b8793e12bc27dc98042b151a <aa5a1e4b882964eb79d5b5d1d1e8a1a5efbb1d15
  13. Affected versionversion=b0abcd65ec545701b8793e12bc27dc98042b151a <e859b216d94668bc66330e61be201234f4413d1a
  14. Affected versionversion=bce966530fd5542bbb422cb45ecb775f7a1a6bc3
  15. Affected versionversion=ef51c0d544b1518b35364480317ab6d3468f205d

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0809fb86ad13b29e1d6d491364fc7ea4fb545995; version=5.10.237 <5.11; version=5.15.181 <5.16; version=538c26d9bf70c90edc460d18c81008a4e555925a; version=6.1.128 <6.2; version=6.11.4 <6.12; version=6.12; version=6.6.57 <6.7; version=8f14a476abba13144df5434871a7225fd29af633; version=b0abcd65ec545701b8793e12bc27dc98042b151a <9502dd5c7029902f4a425bf959917a5a9e7c0e50; version=b0abcd65ec545701b8793e12bc27dc98042b151a <950557922c1298464749c216d8763e97faf5d0a6; version=b0abcd65ec545701b8793e12bc27dc98042b151a <aa5a1e4b882964eb79d5b5d1d1e8a1a5efbb1d15; version=b0abcd65ec545701b8793e12bc27dc98042b151a <e859b216d94668bc66330e61be201234f4413d1a; version=bce966530fd5542bbb422cb45ecb775f7a1a6bc3; version=ef51c0d544b1518b35364480317ab6d3468f205d

Published CVSS scores

9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/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

CWE-416Use After Free
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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