CVE-2025-38075

Kernel crash via restarted NOPIN response timer

Published Jun 18, 2025 · Updated Aug 5, 2026

A NULL pointer dereference in the Linux iSCSI target allows local users to crash affected hosts through a NOPIN timer race. The NOPIN timer can restart the response timer while a connection is being deleted, causing timeout handling to read a null I_T Nexus pointer. Exploitation requires low-privileged local access to a host running the iSCSI target and timing connection deletion against NOPIN expiry; the bounded impact is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A NULL pointer dereference in the Linux iSCSI target allows local users to crash affected hosts through a NOPIN timer race. The NOPIN timer can restart the response timer while a connection is being deleted, causing timeout handling to read a null I_T Nexus pointer. Exploitation requires low-privileged local access to a host running the iSCSI target and timing connection deletion against NOPIN expiry; the bounded impact is a kernel crash.

The record

CVE
CVE-2025-38075
Published
Jun 18, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 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=3.1
  2. Affected versionversion=e48354ce078c079996f89d715dfa44814b4eba01 <019ca2804f3fb49a7f8e56ea6aeaa1ff32724c27
  3. Affected versionversion=e48354ce078c079996f89d715dfa44814b4eba01 <2c5081439c7ab8da08427befe427f0d732ebc9f9
  4. Affected versionversion=e48354ce078c079996f89d715dfa44814b4eba01 <3e6429e3707943078240a2c0c0b3ee99ea9b0d9c
  5. Affected versionversion=e48354ce078c079996f89d715dfa44814b4eba01 <571ce6b6f5cbaf7d24af03cad592fc0e2a54de35
  6. Affected versionversion=e48354ce078c079996f89d715dfa44814b4eba01 <6815846e0c3a62116a7da9740e3a7c10edc5c7e9
  7. Affected versionversion=e48354ce078c079996f89d715dfa44814b4eba01 <7f533cc5ee4c4436cee51dc58e81dfd9c3384418
  8. Affected versionversion=e48354ce078c079996f89d715dfa44814b4eba01 <87389bff743c55b6b85282de91109391f43e0814
  9. Affected versionversion=e48354ce078c079996f89d715dfa44814b4eba01 <fe8421e853ef289e1324fcda004751c89dd9c18a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.1; version=e48354ce078c079996f89d715dfa44814b4eba01 <019ca2804f3fb49a7f8e56ea6aeaa1ff32724c27; version=e48354ce078c079996f89d715dfa44814b4eba01 <2c5081439c7ab8da08427befe427f0d732ebc9f9; version=e48354ce078c079996f89d715dfa44814b4eba01 <3e6429e3707943078240a2c0c0b3ee99ea9b0d9c; version=e48354ce078c079996f89d715dfa44814b4eba01 <571ce6b6f5cbaf7d24af03cad592fc0e2a54de35; version=e48354ce078c079996f89d715dfa44814b4eba01 <6815846e0c3a62116a7da9740e3a7c10edc5c7e9; version=e48354ce078c079996f89d715dfa44814b4eba01 <7f533cc5ee4c4436cee51dc58e81dfd9c3384418; version=e48354ce078c079996f89d715dfa44814b4eba01 <87389bff743c55b6b85282de91109391f43e0814; version=e48354ce078c079996f89d715dfa44814b4eba01 <fe8421e853ef289e1324fcda004751c89dd9c18a

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-476NULL Pointer Dereference
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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