CVE-2025-38513: wifi: zd1211rw: Fix potential NULL pointer dereference in zd_mac_tx_to_dev()

Q: What is the severity of CVE-2025-38513?

CVE-2025-38513 has a medium severity level due to potential system crashes from a NULL pointer dereference.

Q: How do I fix CVE-2025-38513?

To fix CVE-2025-38513, update the Linux kernel to the latest patched version that addresses this vulnerability.

Q: Which systems are affected by CVE-2025-38513?

CVE-2025-38513 affects the Linux kernel, particularly systems using the zd1211rw wireless driver.

Q: What impact does CVE-2025-38513 have?

The impact of CVE-2025-38513 can lead to denial-of-service conditions resulting from application crashes.

Q: Is there a workaround for CVE-2025-38513 until I can update?

Currently, there are no recommended workarounds for CVE-2025-38513, so applying the update is the best course of action.

Published Aug 16, 2025

Updated

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

wifi: zd1211rw: Fix potential NULL pointer dereference in zdmactxtodev()

There is a potential NULL pointer dereference in zdmactxtodev(). For example, the following is possible:

T0 T1 zdmactxtodev() / len == skbqueuelen(q) / while (len > ZDMACMAXACKWAITERS) {

filterack() spinlockirqsave(&q->lock, flags); / position == skbqueuelen(q) / for (i=1; i<position; i++) skb = skbdequeue(q)

if (mac->type == NL80211IFTYPEAP) skb = skbdequeue(q); spinunlockirqrestore(&q->lock, flags);

skbdequeue() -> NULL

Since there is a small gap between checking skb queue length and skb being unconditionally dequeued in zdmactxtodev(), skbdequeue() can return NULL. Then the pointer is passed to zdmactxstatus() where it is dereferenced.

In order to avoid potential NULL pointer dereference due to situations like above, check if skb is not NULL before passing it to zdmactxstatus().

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

Affected Software

242 affected componentsFixes available

Linux Linux kernel

Linux Linux kernel>=2.6.25<5.4.296

Linux Linux kernel>=5.5<5.10.240

Linux Linux kernel>=5.11<5.15.189

Linux Linux kernel>=5.16<6.1.146

Linux Linux kernel>=6.2<6.6.99

Linux Linux kernel>=6.7<6.12.39

Linux Linux kernel>=6.13<6.15.7

Linux Linux kernel=6.16-rc1

Linux Linux kernel=6.16-rc2

Linux Linux kernel=6.16-rc3

Linux Linux kernel=6.16-rc4

Linux Linux kernel=6.16-rc5

Debian Debian Linux=11.0

Microsoft cbl2 kernel 5.15.186.1-1

Patch available

Microsoft azl3 kernel 6.6.96.2-2

Patch available

Microsoft azl3 kernel 6.6.96.2-1

ubuntu/linux*

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ubuntu/linux-lts-xenial*

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-aws-hwe*

ubuntu/linux-azure*

ubuntu/linux-gcp*

ubuntu/linux-hwe*

ubuntu/linux-hwe-edge*

ubuntu/linux-kvm*

ubuntu/linux-oracle*

ubuntu/linux-fips*

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-aws-5.4*

ubuntu/linux-azure*

ubuntu/linux-azure-4.15*

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-5.4*

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

ubuntu/linux-gcp-4.15*

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ubuntu/linux-gke-4.15*

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ubuntu/linux-gkeop-5.4*

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ubuntu/linux-hwe-edge*

ubuntu/linux-ibm-5.4*

ubuntu/linux-kvm*

ubuntu/linux-oem*

ubuntu/linux-oracle*

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-oracle-5.4*

ubuntu/linux-raspi-5.4*

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

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ubuntu/linux-gcp-fips*

ubuntu/linux*

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ubuntu/linux-aws-5.15<5.15.0-1092.99~20.04.1

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ubuntu/linux-aws-5.8*

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ubuntu/linux-gcp-5.15<5.15.0-1092.101~20.04.1

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ubuntu/linux-gcp-5.8*

ubuntu/linux-gke*

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ubuntu/linux-hwe-5.8*

ubuntu/linux-ibm*

ubuntu/linux-ibm-5.15<5.15.0-1086.89~20.04.1

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ubuntu/linux-intel-5.13*

ubuntu/linux-intel-iotg-5.15<5.15.0-1087.93~20.04.1

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ubuntu/linux-iot*

ubuntu/linux-kvm*

ubuntu/linux-lowlatency-hwe-5.15<5.15.0-156.166~20.04.1

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ubuntu/linux-nvidia-tegra-5.15<5.15.0-1045.45~20.04.1

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ubuntu/linux-oem-5.10*

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ubuntu/linux-oracle-5.8*

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ubuntu/linux-riscv-5.8*

ubuntu/linux-xilinx-zynqmp*

ubuntu/linux-aws-fips*

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ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<5.15.0-156.166

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ubuntu/linux-allwinner-5.19*

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ubuntu/linux-aws-5.19*

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ubuntu/linux-aws-6.8<6.8.0-1046.49~22.04.1

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ubuntu/linux-azure<5.15.0-1096.105

5.15.0-1096.105

ubuntu/linux-azure-5.19*

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ubuntu/linux-azure-6.8<6.8.0-1051.57~22.04.1

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ubuntu/linux-azure-fde<5.15.0-1096.105.1

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ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-azure-fde-6.8<6.8.0-1046.53~22.04.1

6.8.0-1046.53~22.04.1

ubuntu/linux-gcp<5.15.0-1092.101

5.15.0-1092.101

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-gcp-6.5*

ubuntu/linux-gcp-6.8<6.8.0-1047.50~22.04.2

6.8.0-1047.50~22.04.2

ubuntu/linux-gke<5.15.0-1089.95

5.15.0-1089.95

ubuntu/linux-gkeop<5.15.0-1075.83

5.15.0-1075.83

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-hwe-6.8<6.8.0-100.100~22.04.1

6.8.0-100.100~22.04.1

ubuntu/linux-ibm<5.15.0-1086.89

5.15.0-1086.89

ubuntu/linux-ibm-6.8<6.8.0-1044.44~22.04.1

6.8.0-1044.44~22.04.1

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-intel-iotg<5.15.0-1087.93

5.15.0-1087.93

ubuntu/linux-kvm<5.15.0-1088.93

5.15.0-1088.93

ubuntu/linux-lowlatency<5.15.0-156.166

5.15.0-156.166

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-lowlatency-hwe-6.8<6.8.0-100.100.1~22.04.1

6.8.0-100.100.1~22.04.1

ubuntu/linux-nvidia<5.15.0-1087.88

5.15.0-1087.88

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-nvidia-6.8<6.8.0-1046.49~22.04.1

6.8.0-1046.49~22.04.1

ubuntu/linux-nvidia-tegra<5.15.0-1045.45

5.15.0-1045.45

ubuntu/linux-nvidia-tegra-igx<5.15.0-1034.34

5.15.0-1034.34

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle<5.15.0-1090.96

5.15.0-1090.96

ubuntu/linux-oracle-6.5*

ubuntu/linux-oracle-6.8<6.8.0-1043.44~22.04.1

6.8.0-1043.44~22.04.1

ubuntu/linux-raspi<5.15.0-1086.89

5.15.0-1086.89

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-riscv-6.5*

ubuntu/linux-riscv-6.8<6.8.0-100.100~22.04.1

6.8.0-100.100~22.04.1

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-xilinx-zynqmp<5.15.0-1056.60

5.15.0-1056.60

ubuntu/linux-bluefield<5.15.0-1076.78

5.15.0-1076.78

ubuntu/linux-intel-iot-realtime<5.15.0-1085.87

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ubuntu/linux-aws-fips<5.15.0-1092.99+fips1

5.15.0-1092.99+fips1

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6.14.0-1017.17~24.04.1

ubuntu/linux-azure<6.8.0-1046.52

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ubuntu/linux-azure-6.11*

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6.14.0-1017.17~24.04.1

ubuntu/linux-azure-fde<6.8.0-1046.53

6.8.0-1046.53

ubuntu/linux-azure-fde-6.14*

ubuntu/linux-azure-nvidia<6.8.0-1039.42

6.8.0-1039.42

ubuntu/linux-azure-nvidia-6.14*

ubuntu/linux-gcp<6.8.0-1047.50

6.8.0-1047.50

ubuntu/linux-gcp-6.11*

ubuntu/linux-gcp-6.14<6.14.0-1020.21~24.04.1

6.14.0-1020.21~24.04.1

ubuntu/linux-gke<6.8.0-1043.48

6.8.0-1043.48

ubuntu/linux-gkeop<6.8.0-1030.33

6.8.0-1030.33

ubuntu/linux-hwe-6.11*

ubuntu/linux-ibm<6.8.0-1044.44

6.8.0-1044.44

ubuntu/linux-intel*

ubuntu/linux-lowlatency<6.8.0-100.100.1

6.8.0-100.100.1

ubuntu/linux-lowlatency-hwe-6.11*

ubuntu/linux-nvidia<6.8.0-1046.49

6.8.0-1046.49

ubuntu/linux-nvidia-6.11*

ubuntu/linux-nvidia-lowlatency<6.8.0-1046.49.1

6.8.0-1046.49.1

ubuntu/linux-nvidia-tegra<6.8.0-1020.20

6.8.0-1020.20

ubuntu/linux-oem-6.11*

ubuntu/linux-oem-6.14<6.14.0-1016.16

6.14.0-1016.16

ubuntu/linux-oem-6.8*

ubuntu/linux-oracle<6.8.0-1043.44

6.8.0-1043.44

ubuntu/linux-oracle-6.14<6.14.0-1017.17~24.04.1

6.14.0-1017.17~24.04.1

ubuntu/linux-raspi<6.8.0-1047.51

6.8.0-1047.51

ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime*

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ubuntu/linux-riscv-6.14<6.14.0-36.36.1~24.04.1

6.14.0-36.36.1~24.04.1

ubuntu/linux-xilinx<6.8.0-1023.24

6.8.0-1023.24

ubuntu/linux-bluefield<6.8.0-1016.20

6.8.0-1016.20

ubuntu/linux-raspi-realtime<6.8.0-2037.38

6.8.0-2037.38

ubuntu/linux-realtime<6.8.1-1041.42

6.8.1-1041.42

ubuntu/linux-realtime-6.14<6.14.0-1016.16~24.04.1

6.14.0-1016.16~24.04.1

ubuntu/linux-aws-fips<6.8.0-1046.49+fips1

6.8.0-1046.49+fips1

ubuntu/linux-azure-fips<6.8.0-1046.52+fips1

6.8.0-1046.52+fips1

ubuntu/linux-fips<6.8.0-100.100+fips1

6.8.0-100.100+fips1

ubuntu/linux-gcp-fips<6.8.0-1047.50+fips1

6.8.0-1047.50+fips1

ubuntu/linux-azure-fde*

ubuntu/linux-vmware*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

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Fixed in 5.15.0-1092.99~20.04.1
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Fixed in 6.14.0-36.36.1~24.04.1
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Upgrade ubuntu/linux-xilinx to a version that resolves this vulnerability.
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
Compensating control
In the Linux kernel zd1211rw driver, update zd_mac_tx_to_dev() to check that skb is not NULL before passing it to zd_mac_tx_status().

Event History

Aug 16, 2025

CVE Published

via MITRE·10:55 AM

Data Sourced

via MITRE·10:55 AM

Description

Data Sourced

via OSV·11:15 AM

DescriptionSeverityAffected Software

Data Sourced

via NVD·11:15 AM

RemedyDescriptionSeverityWeaknessAffected Software

Sep 4, 2025

Data Sourced

via Microsoft·01:21 AM

DescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

What is the severity of CVE-2025-38513?

CVE-2025-38513 has a medium severity level due to potential system crashes from a NULL pointer dereference.

How do I fix CVE-2025-38513?

To fix CVE-2025-38513, update the Linux kernel to the latest patched version that addresses this vulnerability.

Which systems are affected by CVE-2025-38513?

CVE-2025-38513 affects the Linux kernel, particularly systems using the zd1211rw wireless driver.

What impact does CVE-2025-38513 have?

The impact of CVE-2025-38513 can lead to denial-of-service conditions resulting from application crashes.

Is there a workaround for CVE-2025-38513 until I can update?

Currently, there are no recommended workarounds for CVE-2025-38513, so applying the update is the best course of action.

CVE-2025-38513: wifi: zd1211rw: Fix potential NULL pointer dereference in zd_mac_tx_to_dev()

Affected Software

Remediation

Event History

Frequently Asked Questions

What is the severity of CVE-2025-38513?

How do I fix CVE-2025-38513?

Which systems are affected by CVE-2025-38513?

What impact does CVE-2025-38513 have?

Is there a workaround for CVE-2025-38513 until I can update?

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