CVE-2025-38274

Service interruption via unchecked KUnit allocation

Published Jul 10, 2025 · Updated May 11, 2026

NULL pointer dereference in Linux kernel 6.6 and later affected branches allows local users to interrupt FPGA KUnit testing. The fpga_mgr_test_img_load_sgt() helper fails to check whether kunit_kzalloc() returned NULL before passing the pointer through sg_alloc_table() to __sg_alloc_table(), where memset() dereferences it. Reachability requires low-privileged local access, the FPGA KUnit test path, and a failed allocation; the documented consequence is an availability-only interruption.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

NULL pointer dereference in Linux kernel 6.6 and later affected branches allows local users to interrupt FPGA KUnit testing. The fpga_mgr_test_img_load_sgt() helper fails to check whether kunit_kzalloc() returned NULL before passing the pointer through sg_alloc_table() to __sg_alloc_table(), where memset() dereferences it. Reachability requires low-privileged local access, the FPGA KUnit test path, and a failed allocation; the documented consequence is an availability-only interruption.

The record

CVE
CVE-2025-38274
Published
Jul 10, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 10, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=6.6
  2. Affected versionversion=ccbc1c302115d8125d6a96296ba52702c6de0ade <6ebf1982038af12f3588417e4fd0417d2551da28
  3. Affected versionversion=ccbc1c302115d8125d6a96296ba52702c6de0ade <8b2230ac7ff0aeb2441132df638a82ab124f8624
  4. Affected versionversion=ccbc1c302115d8125d6a96296ba52702c6de0ade <e69e2cfd8b38d9463a250e153ef4963a604d61e9
  5. Affected versionversion=ccbc1c302115d8125d6a96296ba52702c6de0ade <eb4c74eaa6e2d15f3bbd32941c9d2a25b29a718d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.6; version=ccbc1c302115d8125d6a96296ba52702c6de0ade <6ebf1982038af12f3588417e4fd0417d2551da28; version=ccbc1c302115d8125d6a96296ba52702c6de0ade <8b2230ac7ff0aeb2441132df638a82ab124f8624; version=ccbc1c302115d8125d6a96296ba52702c6de0ade <e69e2cfd8b38d9463a250e153ef4963a604d61e9; version=ccbc1c302115d8125d6a96296ba52702c6de0ade <eb4c74eaa6e2d15f3bbd32941c9d2a25b29a718d

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo