CVE-2026-45924Network attack vector

SMB service deadlock via unbalanced error-path cleanup

Published May 27, 2026 · Updated May 27, 2026

Improper locking in Linux Kernel ksmbd allows remote authenticated users to interrupt SMB service through file-operation error paths. Two returns in fs/smb/server/smb2pdu.c omit ksmbd_vfs_kern_path_end_removing() after a successful start call, retaining inode locks and references. Reachability requires an enabled ksmbd SMB server and operations that enter those error branches; the resulting lock leak can hang ksmbd work and concurrent filesystem operations.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in Linux Kernel ksmbd allows remote authenticated users to interrupt SMB service through file-operation error paths. Two returns in fs/smb/server/smb2pdu.c omit ksmbd_vfs_kern_path_end_removing() after a successful start call, retaining inode locks and references. Reachability requires an enabled ksmbd SMB server and operations that enter those error branches; the resulting lock leak can hang ksmbd work and concurrent filesystem operations.

The record

CVE
CVE-2026-45924
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-667, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 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=1e858a7a51c7b8b009d8f246de7ceb7743b44a71 <cf29329a13df79c198b45dfc92577638d30b56fa
  2. Affected versionversion=5.15.190 <5.15.203
  3. Affected versionversion=6.1.149 <6.1.167
  4. Affected versionversion=6.12.43 <6.12.78
  5. Affected versionversion=6.15.11 <6.16
  6. Affected versionversion=6.16.2 <6.17
  7. Affected versionversion=6.17
  8. Affected versionversion=6.6.103 <6.6.130
  9. Affected versionversion=814cfdb6358d9b84fcbec9918c8f938cc096a43a <34d6691933682f0516259a31b39d2cebcedec0a5
  10. Affected versionversion=9d5012ffe14120f978ee34aef4df3d6cb026b7c4 <8e3a3192ef78d8302916408d62813b1fddfc8972
  11. Affected versionversion=a726fef6d7d4cfc365d3434e3916dbfe78991a33
  12. Affected versionversion=a7dddd62578c2eb6cb28b8835556a121b5157323
  13. Affected versionversion=ac98d54630d5b52e3f684d872f0d82c06c418ea9 <f221baa80e5959a0c08a7e34abbf2a4d3cf0e1c2
  14. Affected versionversion=d5fc1400a34b4ea5e8f2ce296ea12bf8c8421694 <0c578e8065c4b08d5635a4cbc0f6321df9d20f79
  15. Affected versionversion=d5fc1400a34b4ea5e8f2ce296ea12bf8c8421694 <4c38600feb81c670edb82e49d201d3d2d00cd4c3
  16. Affected versionversion=d5fc1400a34b4ea5e8f2ce296ea12bf8c8421694 <a09dc10d1353f0e92c21eae2a79af1c2b1ddcde8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1e858a7a51c7b8b009d8f246de7ceb7743b44a71 <cf29329a13df79c198b45dfc92577638d30b56fa; version=5.15.190 <5.15.203; version=6.1.149 <6.1.167; version=6.12.43 <6.12.78; version=6.15.11 <6.16; version=6.16.2 <6.17; version=6.17; version=6.6.103 <6.6.130; version=814cfdb6358d9b84fcbec9918c8f938cc096a43a <34d6691933682f0516259a31b39d2cebcedec0a5; version=9d5012ffe14120f978ee34aef4df3d6cb026b7c4 <8e3a3192ef78d8302916408d62813b1fddfc8972; version=a726fef6d7d4cfc365d3434e3916dbfe78991a33; version=a7dddd62578c2eb6cb28b8835556a121b5157323; version=ac98d54630d5b52e3f684d872f0d82c06c418ea9 <f221baa80e5959a0c08a7e34abbf2a4d3cf0e1c2; version=d5fc1400a34b4ea5e8f2ce296ea12bf8c8421694 <0c578e8065c4b08d5635a4cbc0f6321df9d20f79; version=d5fc1400a34b4ea5e8f2ce296ea12bf8c8421694 <4c38600feb81c670edb82e49d201d3d2d00cd4c3; version=d5fc1400a34b4ea5e8f2ce296ea12bf8c8421694 <a09dc10d1353f0e92c21eae2a79af1c2b1ddcde8

Published CVSS scores

6.5Amazon LinuxCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
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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