CVE-2025-38069

Kernel crash via stale BAR allocation pointer

Published Jun 18, 2025 · Updated May 11, 2026

Double free in the Linux kernel PCI endpoint test function allows local users to crash the kernel during endpoint reinitialization. When pci_epc_set_bar() fails, pci_epf_free_space() frees a BAR allocation without clearing epf_test->reg[bar], so a later allocation attempt frees it again. Triggering the oops requires PCI endpoint mode, exhaustion of an inbound window, and a host reboot that deasserts PERST#.

CVSS severity7.8
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double free in the Linux kernel PCI endpoint test function allows local users to crash the kernel during endpoint reinitialization. When pci_epc_set_bar() fails, pci_epf_free_space() frees a BAR allocation without clearing epf_test->reg[bar], so a later allocation attempt frees it again. Triggering the oops requires PCI endpoint mode, exhaustion of an inbound window, and a host reboot that deasserts PERST#.

The record

CVE
CVE-2025-38069
Published
Jun 18, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-415, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 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

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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=349e7a85b25fa6ee82902d9be2cc5f3bec815120 <8b83893d1f6c6061a7d58169ecdf9d5ee9f306ee
  2. Affected versionversion=349e7a85b25fa6ee82902d9be2cc5f3bec815120 <934e9d137d937706004c325fa1474f9e3f1ba10a
  3. Affected versionversion=349e7a85b25fa6ee82902d9be2cc5f3bec815120 <fe2329eff5bee461ebcafadb6ca1df0cbf5945fd
  4. Affected versionversion=4.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=349e7a85b25fa6ee82902d9be2cc5f3bec815120 <8b83893d1f6c6061a7d58169ecdf9d5ee9f306ee; version=349e7a85b25fa6ee82902d9be2cc5f3bec815120 <934e9d137d937706004c325fa1474f9e3f1ba10a; version=349e7a85b25fa6ee82902d9be2cc5f3bec815120 <fe2329eff5bee461ebcafadb6ca1df0cbf5945fd; version=4.12

Published CVSS scores

7.8NIST NVDCVSS: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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-415Double Free
T1499Endpoint Denial of Service

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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