CVE-2025-37974

System crash via unchecked error-pointer dereference

Published May 20, 2025 · Updated May 23, 2026

NULL pointer dereference in the Linux kernel allows a kernel-internal allocation failure to crash affected s390 systems during PCI discovery. In __clp_add(), an unchecked error pointer returned by zpci_create_device() is treated as a struct zpci_dev pointer and dereferenced while adding it to scan_list. Reachability requires an s390 PCI hotplug event and an internal allocation failure, prerequisites that Ubuntu reports attackers cannot invoke or influence.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the Linux kernel allows a kernel-internal allocation failure to crash affected s390 systems during PCI discovery. In __clp_add(), an unchecked error pointer returned by zpci_create_device() is treated as a struct zpci_dev pointer and dereferenced while adding it to scan_list. Reachability requires an s390 PCI hotplug event and an internal allocation failure, prerequisites that Ubuntu reports attackers cannot invoke or influence.

The record

CVE
CVE-2025-37974
Published
May 20, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. May 20, 2025CVE publishedPublication date reported by the CVE source.
  2. May 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=0467cdde8c4320bbfdb31a8cff1277b202f677fc <2769b718e164df983c20c314b263a71a699be6cd
  2. Affected versionversion=0467cdde8c4320bbfdb31a8cff1277b202f677fc <42420c50c68f3e95e90de2479464f420602229fc
  3. Affected versionversion=1f3b309108fd0660ea8614a72328ba866ccd3378 <be54b750c333a9db7c3b3686846bb06b07b011fe
  4. Affected versionversion=6.12.5 <6.12.29
  5. Affected versionversion=6.13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=0467cdde8c4320bbfdb31a8cff1277b202f677fc <2769b718e164df983c20c314b263a71a699be6cd; version=0467cdde8c4320bbfdb31a8cff1277b202f677fc <42420c50c68f3e95e90de2479464f420602229fc; version=1f3b309108fd0660ea8614a72328ba866ccd3378 <be54b750c333a9db7c3b3686846bb06b07b011fe; version=6.12.5 <6.12.29; version=6.13

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.4OracleCVSS:3.1/AV:L/AC:H/PR:H/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)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference

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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