VulnerabilityPublished 3 Jul 2025Updated 5 Nov 2026

CVE-2025-38134: Linux kernel · usb: acpi: Prevent null pointer dereference in usb_acpi_add_usb4_devlink()

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in e3d530173b70514d4390a94f9f979acad689b70a : update Linux kernel when convenient.

Data as of 5 Nov 2026, 21:19 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-05.

Patch

Available – fixed in e3d530173b70514d4390a94f9f979acad689b70a, 73fb0ec9436ae87bcae067ce35d6cdd72bade86c, 8fa544bff8466062e42949c93f3e528f4be5624b

Exploitation evidence

Disclosed: evidence found.
CVE published 3 Jul 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Linux kernel to e3d530173b70514d4390a94f9f979acad689b70a, 73fb0ec9436ae87bcae067ce35d6cdd72bade86c or 8fa544bff8466062e42949c93f3e528f4be5624b.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ f1bfb4a6fed64de1771b43a76631942279851744, < e3d530173b70514d4390a94f9f979acad689b70a	Fixed in e3d530173b70514d4390a94f9f979acad689b70a
LinuxLinux	Affected ≥ f1bfb4a6fed64de1771b43a76631942279851744, < 73fb0ec9436ae87bcae067ce35d6cdd72bade86c	Fixed in 73fb0ec9436ae87bcae067ce35d6cdd72bade86c
LinuxLinux	Affected ≥ f1bfb4a6fed64de1771b43a76631942279851744, < 8fa544bff8466062e42949c93f3e528f4be5624b	Fixed in 8fa544bff8466062e42949c93f3e528f4be5624b
LinuxLinux	Affected =6.12	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: usb: acpi: Prevent null pointer dereference in usb_acpi_add_usb4_devlink() As demonstrated by the fix for update_port_device_state, commit 12783c0b9e2c ("usb: core: Prevent null pointer dereference in update_port_device_state"), usb_hub_to_struct_hub() can return NULL in certain scenarios, such as during hub driver unbind or teardown race conditions, even if the underlying usb_device structure exists. Plus, all other places that call usb_hub_to_struct_hub() in the same file do check for NULL return values. If usb_hub_to_struct_hub() returns NULL, the subsequent access to hub->ports[udev->portnum - 1] will cause a null pointer dereference.

References

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