CVE-2026-23444: wifi: mac80211: always free skb on ieee80211_tx_prepare_skb() failure

Q: What is the severity of CVE-2026-23444?

CVE-2026-23444 has a severity rating of high, with a score of 7.8.

Q: How do I fix CVE-2026-23444?

To fix CVE-2026-23444, you should upgrade to the latest version of the Linux kernel that includes the patches for this vulnerability.

Q: What are the potential impacts of CVE-2026-23444?

CVE-2026-23444 can lead to memory leaks, which may affect system stability and performance.

Q: Which software is affected by CVE-2026-23444?

CVE-2026-23444 affects the Linux kernel, specifically the mac80211 subsystem.

Q: When was CVE-2026-23444 published?

CVE-2026-23444 was published on April 3, 2026.

Published Apr 3, 2026

Updated

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

wifi: mac80211: always free skb on ieee80211txprepareskb() failure

ieee80211txprepareskb() has three error paths, but only two of them free the skb. The first error path (ieee80211txprepare() returning TXDROP) does not free it, while invoketxhandlers() failure and the fragmentation check both do.

Add kfreeskb() to the first error path so all three are consistent, and remove the now-redundant frees in callers (ath9k, mt76, mac80211hwsim) to avoid double-free.

Document the skb ownership guarantee in the function's kdoc.

Affected Software

255 affected componentsFixes available

Linux Foundation Linux kernel (mac80211)

Microsoft azl3 kernel 6.6.134.1-2

Linux Linux kernel>=3.13.1<6.18.20

Linux Linux kernel>=6.19<6.19.10

Linux Linux kernel=3.13

Linux Linux kernel=7.0-rc1

Linux Linux kernel=7.0-rc2

Linux Linux kernel=7.0-rc3

Linux Linux kernel=7.0-rc4

Linux Linux kernel=7.0-rc5

Linux Linux kernel=7.0-rc6

Linux Linux kernel=7.0-rc7

debian/linux

6.1.176-16.1.190-16.12.107-16.12.115-27.2.12-17.2.15-1

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-azure*

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*

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ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

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ubuntu/linux-oem*

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ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

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ubuntu/linux-riscv-5.8*

ubuntu/linux-xilinx-zynqmp*

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

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ubuntu/linux-gcp<5.15.0-1112.122

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ubuntu/linux-gcp-5.19*

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ubuntu/linux-gkeop<5.15.0-1095.103

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ubuntu/linux-ibm<5.15.0-1106.110

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ubuntu/linux-intel-iot-realtime*

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5.15.0-1107.113

ubuntu/linux-kvm<5.15.0-1104.109

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ubuntu/linux-lowlatency<5.15.0-184.194

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ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-lowlatency-hwe-6.8<6.8.0-136.136.2~22.04.1

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ubuntu/linux-nvidia<5.15.0-1107.108

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ubuntu/linux-nvidia-6.2*

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6.8.0-1059.62~22.04.1

ubuntu/linux-nvidia-tegra<5.15.0-1064.66

5.15.0-1064.66

ubuntu/linux-nvidia-tegra-igx<5.15.0-1053.53

5.15.0-1053.53

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle<5.15.0-1109.115

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ubuntu/linux-oracle-6.5*

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6.8.0-1058.61~22.04.1

ubuntu/linux-raspi<5.15.0-1106.109

5.15.0-1106.109

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

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ubuntu/linux-starfive-5.19*

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ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

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ubuntu/linux-aws<6.8.0-1061.64

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ubuntu/linux-aws-6.14*

ubuntu/linux-aws-6.17*

ubuntu/linux-azure<6.8.0-1063.71

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ubuntu/linux-azure-fde<6.8.0-1062.69

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ubuntu/linux-azure-fde-6.14*

ubuntu/linux-azure-nvidia*

ubuntu/linux-azure-nvidia-6.14*

ubuntu/linux-gcp<6.8.0-1064.72

6.8.0-1064.72

ubuntu/linux-gcp-6.11*

ubuntu/linux-gcp-6.14*

ubuntu/linux-gke<6.8.0-1059.67

6.8.0-1059.67

ubuntu/linux-gkeop<6.8.0-1046.50

6.8.0-1046.50

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ubuntu/linux-hwe-6.14*

ubuntu/linux-hwe-6.17*

ubuntu/linux-ibm<6.8.0-1061.62

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ubuntu/linux-lowlatency<6.8.0-136.136.2

6.8.0-136.136.2

ubuntu/linux-lowlatency-hwe-6.11*

ubuntu/linux-nvidia<6.8.0-1059.62

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ubuntu/linux-nvidia-6.11*

ubuntu/linux-nvidia-6.17*

ubuntu/linux-nvidia-lowlatency<6.8.0-1059.62.1

6.8.0-1059.62.1

ubuntu/linux-nvidia-tegra<6.8.0-1030.31

6.8.0-1030.31

ubuntu/linux-oem-6.11*

ubuntu/linux-oem-6.14*

ubuntu/linux-oem-6.17*

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ubuntu/linux-oracle<6.8.0-1058.61

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ubuntu/linux-oracle-6.14*

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ubuntu/linux-raspi<6.8.0-1061.65

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ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime*

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ubuntu/linux-riscv-6.14*

ubuntu/linux-riscv-6.17*

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ubuntu/linux-xilinx<6.8.0-1033.34

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ubuntu/linux-bluefield<6.8.0-1028.33

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ubuntu/linux-raspi-realtime<6.8.0-2050.52

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ubuntu/linux-realtime<6.8.1-1056.57

6.8.1-1056.57

ubuntu/linux-realtime-6.14*

ubuntu/linux-realtime-6.17*

ubuntu/linux-aws-fips<6.8.0-1061.64+fips1

6.8.0-1061.64+fips1

ubuntu/linux-azure-fips<6.8.0-1063.71+fips2

6.8.0-1063.71+fips2

ubuntu/linux-fips<6.8.0-136.136+fips2

6.8.0-136.136+fips2

ubuntu/linux-gcp-fips<6.8.0-1064.72+fips1

6.8.0-1064.72+fips1

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-azure*

ubuntu/linux-azure-fde*

ubuntu/linux-gcp*

ubuntu/linux-oracle*

ubuntu/linux-raspi*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade debian/linux to a version that resolves this vulnerability.
Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.115-2Fixed in 7.2.12-1Fixed in 7.2.15-1
Upgrade
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Fixed in 5.15.0-1112.119~20.04.1
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Fixed in 5.15.0-1117.126~20.04.1
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Fixed in 5.15.0-1117.126~20.04.2
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Fixed in 5.15.0-1112.122~20.04.1
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Fixed in 5.15.0-186.196~20.04.1
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Fixed in 5.15.0-1106.110~20.04.1
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Fixed in 5.15.0-1107.113~20.04.1
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Fixed in 5.15.0-184.194~20.04.1
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Fixed in 5.15.0-1064.66~20.04.1
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Fixed in 5.15.0-1109.115~20.04.1
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Fixed in 5.15.0-1106.110~20.04.1
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Fixed in 5.15.0-186.196
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Fixed in 5.15.0-1112.119
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Fixed in 6.8.0-1061.64~22.04.1
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Fixed in 5.15.0-1117.126
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Fixed in 6.8.0-1063.71~22.04.1
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Fixed in 5.15.0-1117.126
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Fixed in 6.8.0-1062.69~22.04.1
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Fixed in 5.15.0-1112.122
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Fixed in 6.8.0-1064.72~22.04.1
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Fixed in 5.15.0-1108.114
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Fixed in 5.15.0-1095.103
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Fixed in 6.8.0-136.136~22.04.1
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Fixed in 5.15.0-1106.110
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Fixed in 6.8.0-1061.62~22.04.1
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Fixed in 5.15.0-1107.113
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Fixed in 5.15.0-1104.109
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Fixed in 5.15.0-184.194
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Fixed in 6.8.0-136.136.2~22.04.1
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Fixed in 5.15.0-1107.108
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Fixed in 6.8.0-1059.62~22.04.1
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Fixed in 5.15.0-1064.66
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Fixed in 5.15.0-1053.53
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Fixed in 5.15.0-1109.115
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Fixed in 6.8.0-1058.61~22.04.1
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Fixed in 5.15.0-1106.109
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Fixed in 6.8.0-136.136~22.04.3
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Fixed in 5.15.0-1075.79
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Fixed in 5.15.0-1096.98
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Fixed in 5.15.0-1104.106
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Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.
Fixed in 5.15.0-1111.120
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Upgrade ubuntu/linux-realtime-6.8 to a version that resolves this vulnerability.
Fixed in 6.8.1-1056.57~22.04.2
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Fixed in 5.15.0-1112.119+fips1
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Fixed in 5.15.0-1117.126+fips1
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Fixed in 5.15.0-186.196+fips1
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Fixed in 5.15.0-1112.122+fips1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 6.8.0-136.136
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Fixed in 6.8.0-1061.64
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Fixed in 6.8.0-1063.71
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Fixed in 6.8.0-1062.69
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Fixed in 6.8.0-1064.72
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Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.
Fixed in 6.8.0-1059.67
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Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.
Fixed in 6.8.0-1046.50
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Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 6.8.0-1061.62
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Fixed in 6.8.0-136.136.2
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Fixed in 6.8.0-1059.62
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Fixed in 6.8.0-1059.62.1
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Fixed in 6.8.0-1030.31
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Fixed in 6.8.0-1058.61
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Fixed in 6.8.0-1061.65
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Fixed in 6.8.0-1008.8
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Fixed in 6.8.0-1033.34
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Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.
Fixed in 6.8.0-1028.33
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Fixed in 6.8.0-2050.52
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Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.
Fixed in 6.8.1-1056.57
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Fixed in 6.8.0-1061.64+fips1
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Upgrade ubuntu/linux-azure-fips to a version that resolves this vulnerability.
Fixed in 6.8.0-1063.71+fips2
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Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.
Fixed in 6.8.0-136.136+fips2
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Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.
Fixed in 6.8.0-1064.72+fips1
Compensating control
Update ieee80211_tx_prepare_skb() so the TX_DROP error path calls kfree_skb(), document the function's skb ownership guarantee in its kdoc, and remove the now-redundant frees in the ath9k, mt76, and mac80211_hwsim callers to prevent double-free.

Event History

Apr 3, 2026

CVE Published

via MITRE·03:15 PM

Data Sourced

via MITRE·03:15 PM

DescriptionSeverity

Data Sourced

via NVD·04:16 PM

RemedyDescriptionSeverityWeaknessAffected Software

Apr 5, 2026

Data Sourced

via Microsoft·08:02 AM

DescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

DSA-6238

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

What is the severity of CVE-2026-23444?

CVE-2026-23444 has a severity rating of high, with a score of 7.8.

How do I fix CVE-2026-23444?

To fix CVE-2026-23444, you should upgrade to the latest version of the Linux kernel that includes the patches for this vulnerability.

What are the potential impacts of CVE-2026-23444?

CVE-2026-23444 can lead to memory leaks, which may affect system stability and performance.

Which software is affected by CVE-2026-23444?

CVE-2026-23444 affects the Linux kernel, specifically the mac80211 subsystem.

When was CVE-2026-23444 published?

CVE-2026-23444 was published on April 3, 2026.

CVE-2026-23444: wifi: mac80211: always free skb on ieee80211_tx_prepare_skb() failure

Affected Software

Remediation

Event History

Parent advisories

Peer vulnerabilities

Frequently Asked Questions

What is the severity of CVE-2026-23444?

How do I fix CVE-2026-23444?

What are the potential impacts of CVE-2026-23444?

Which software is affected by CVE-2026-23444?

When was CVE-2026-23444 published?

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