CVE-2025-38604: wifi: rtl818x: Kill URBs before clearing tx status queue

Q: What is the severity of CVE-2025-38604?

CVE-2025-38604 has been classified with a medium severity level due to potential risks in memory handling.

Q: How do I fix CVE-2025-38604?

To fix CVE-2025-38604, update your Linux kernel to a version that includes the security patch addressing this vulnerability.

Q: What systems are affected by CVE-2025-38604?

CVE-2025-38604 affects various versions of the Linux kernel that utilize the rtl8187 wireless driver.

Q: What are the potential impacts of CVE-2025-38604?

The impacts of CVE-2025-38604 may include memory corruption or crashes when handling USB requests in the affected wireless driver.

Q: Who is responsible for patching CVE-2025-38604?

Linux distribution maintainers are responsible for applying the patch for CVE-2025-38604 in their kernel updates.

Published Aug 19, 2025

Updated

In the Linux kernel, the following vulnerability has been resolved:

wifi: rtl818x: Kill URBs before clearing tx status queue

In rtl8187stop() move the call of usbkillanchoredurbs() before clearing btxstatus.queue. This change prevents callbacks from using already freed skb due to anchor was not killed before freeing such skb.

BUG: kernel NULL pointer dereference, address: 0000000000000080 #PF: supervisor read access in kernel mode #PF: errorcode(0x0000) - not-present page PGD 0 P4D 0 Oops: Oops: 0000 [#1] SMP NOPTI CPU: 7 UID: 0 PID: 0 Comm: swapper/7 Not tainted 6.15.0 #8 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015 RIP: 0010:ieee80211txstatusirqsafe+0x21/0xc0 [mac80211] Call Trace: <IRQ> rtl8187txcb+0x116/0x150 [rtl8187] usbhcdgivebackurb+0x9d/0x120 usbgivebackurbbh+0xbb/0x140 processonework+0x19b/0x3c0 bhworker+0x1a7/0x210 taskletaction+0x10/0x30 handlesoftirqs+0xf0/0x340 irqexitrcu+0xcd/0xf0 commoninterrupt+0x85/0xa0 </IRQ>

Tested on RTL8187BvE device.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Affected Software

237 affected componentsFixes available

Linux Kernel

Microsoft azl3 kernel 6.6.96.2-1

Microsoft cbl2 kernel 5.15.186.1-1

Patch available

Microsoft azl3 kernel 6.6.96.2-2

Patch available

Linux Linux kernel>=2.6.29<5.4.297

Linux Linux kernel>=5.5<5.10.241

Linux Linux kernel>=5.11<5.15.190

Linux Linux kernel>=5.16<6.1.148

Linux Linux kernel>=6.2<6.6.102

Linux Linux kernel>=6.7<6.12.42

Linux Linux kernel>=6.13<6.15.10

Linux Linux kernel>=6.16<6.16.1

Debian Debian Linux=11.0

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5.15.0-163.173

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6.8.0-1047.50+fips1

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Remediation

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Fixed in 6.8.0-1023.24
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Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 6.8.0-1016.20
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Upgrade ubuntu/linux-raspi-realtime to a version that resolves this vulnerability.
Fixed in 6.8.0-2037.38
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Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.
Fixed in 6.8.1-1041.42
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Upgrade ubuntu/linux-realtime-6.14 to a version that resolves this vulnerability.
Fixed in 6.14.0-1016.16~24.04.1
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Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.
Fixed in 6.8.0-1046.49+fips1
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Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 6.8.0-1046.52+fips1
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Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 6.8.0-100.100+fips1
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Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 6.8.0-1047.50+fips1

Event History

Aug 19, 2025

CVE Published

via MITRE·05:03 PM

Data Sourced

via MITRE·05:03 PM

DescriptionSeverity

Data Sourced

via OSV·05:15 PM

DescriptionSeverityAffected Software

Event

via OSV·05:15 PM

Data Sourced

via NVD·05:15 PM

RemedyDescriptionSeverityWeaknessAffected Software

Sep 4, 2025

Data Sourced

via Microsoft·02:44 AM

DescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

What is the severity of CVE-2025-38604?

CVE-2025-38604 has been classified with a medium severity level due to potential risks in memory handling.

How do I fix CVE-2025-38604?

To fix CVE-2025-38604, update your Linux kernel to a version that includes the security patch addressing this vulnerability.

What systems are affected by CVE-2025-38604?

CVE-2025-38604 affects various versions of the Linux kernel that utilize the rtl8187 wireless driver.

What are the potential impacts of CVE-2025-38604?

The impacts of CVE-2025-38604 may include memory corruption or crashes when handling USB requests in the affected wireless driver.

Who is responsible for patching CVE-2025-38604?

Linux distribution maintainers are responsible for applying the patch for CVE-2025-38604 in their kernel updates.

CVE-2025-38604: wifi: rtl818x: Kill URBs before clearing tx status queue

Affected Software

Remediation

Event History

Frequently Asked Questions

What is the severity of CVE-2025-38604?

How do I fix CVE-2025-38604?

What systems are affected by CVE-2025-38604?

What are the potential impacts of CVE-2025-38604?

Who is responsible for patching CVE-2025-38604?

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