CVE-2025-38265

Kernel crash via unset JSM device pointer

Published Jul 10, 2025 · Updated May 11, 2026

NULL pointer dereference in the Linux JSM serial driver from 6.5 allows local users to crash the kernel during PCI device probing. jsm_uart_port_init leaves uart_port.dev unset before serial_core_register_port passes the port to serial_base_ctrl_add, which dereferences the missing device pointer. Triggering requires local access and a supported Digi Neo PCIe serial card; the documented consequence is a kernel oops and service interruption.

CVSS severity6.8
Medium
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

NULL pointer dereference in the Linux JSM serial driver from 6.5 allows local users to crash the kernel during PCI device probing. jsm_uart_port_init leaves uart_port.dev unset before serial_core_register_port passes the port to serial_base_ctrl_add, which dereferences the missing device pointer. Triggering requires local access and a supported Digi Neo PCIe serial card; the documented consequence is a kernel oops and service interruption.

The record

CVE
CVE-2025-38265
Published
Jul 10, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
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

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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=6.5
  2. Affected versionversion=84a9582fd203063cd4d301204971ff2cd8327f1a <3258d7ff8ebfa451426662b23e8f2b51b129afe1
  3. Affected versionversion=84a9582fd203063cd4d301204971ff2cd8327f1a <985961dd2688a527a4847300d41beaad475ab7af
  4. Affected versionversion=84a9582fd203063cd4d301204971ff2cd8327f1a <a14c0d2eb3f0b1836fdec22908b87ecffd2ac844
  5. Affected versionversion=84a9582fd203063cd4d301204971ff2cd8327f1a <abaecb2a4ad021c2f2426e9b2a9c020aef57aca9
  6. Affected versionversion=84a9582fd203063cd4d301204971ff2cd8327f1a <e3975aa899c0a3bbc10d035e699b142cd1373a71

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.5; version=84a9582fd203063cd4d301204971ff2cd8327f1a <3258d7ff8ebfa451426662b23e8f2b51b129afe1; version=84a9582fd203063cd4d301204971ff2cd8327f1a <985961dd2688a527a4847300d41beaad475ab7af; version=84a9582fd203063cd4d301204971ff2cd8327f1a <a14c0d2eb3f0b1836fdec22908b87ecffd2ac844; version=84a9582fd203063cd4d301204971ff2cd8327f1a <abaecb2a4ad021c2f2426e9b2a9c020aef57aca9; version=84a9582fd203063cd4d301204971ff2cd8327f1a <e3975aa899c0a3bbc10d035e699b142cd1373a71

Published CVSS scores

6.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
5.5SUSECVSS: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

T1499Endpoint Denial of Service

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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