UBUNTU-CVE-2026-90380: Use After Free

Q: Which systems are most likely exposed?

Systems running one of the listed Ubuntu kernel packages and using the affected MediaTek mt76/mt792x Wi-Fi driver are the relevant exposure set. The issue occurs in receive processing after a station has been removed.

Q: Does exploitation require an authenticated local user or user interaction?

The supplied CVSS vector indicates no privileges and no user interaction are required, with adjacent-network attack vector access. Attack conditions are described as a race between station removal and receive processing.

Q: What is the impact if the race is triggered?

The race can cause a use-after-free in mt76_rx_poll_complete, producing invalid memory access during Wi-Fi receive polling. The provided severity vector rates confidentiality, integrity, and availability impact as high.

Q: How can administrators recognize a possible occurrence?

A kernel report may show KASAN invalid-access errors in mt76_rx_poll_complete, with call-trace entries such as mt76_dma_rx_poll, mt792x_poll_rx, and napi_threaded_poll.

Published Sep 17, 2026

Updated

In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt792x: fix use-after-free in mt76rxpollcomplete A use-after-free issue occurs in mt76rxpollcomplete due to a race condition. The STA has already been removed, but the rxstatus still had a pointer to the wcid in the STA. Set the links' wcid pointers to be NULL for a MLD in mt7925staprercuremove() BUG: KASAN: invalid-access in mt76rxpollcomplete+0x280/0x470 Call trace: dumpbacktrace+0xec/0x128 showstack+0x18/0x28 dumpstacklvl+0x40/0xc8 printreport+0x1b8/0x710 kasanreport+0xe0/0x144 dobadarea+0x120/0x260 dotagcheckfault+0x20/0x34 domemabort+0x54/0xa8 el1abort+0x3c/0x5c el1h64synchandler+0x40/0xcc el1h64sync+0x7c/0x80 mt76rxpollcomplete+0x280/0x470 mt76dmarxpoll+0x114/0x51c mt792xpollrx+0x60/0xf8 napithreadedpollloop+0xe0/0x450 napithreadedpoll+0x80/0x9c kthread+0x11c/0x158 retfromfork+0x10/0x20

Affected Software

162 affected componentsFixes available

ubuntu/linux-hwe-edge*

ubuntu/linux-aws-5.0*

ubuntu/linux-aws-5.3*

ubuntu/linux-azure*

ubuntu/linux-azure-5.3*

ubuntu/linux-azure-edge*

ubuntu/linux-gcp*

ubuntu/linux-gcp-5.3*

ubuntu/linux-gke-4.15*

ubuntu/linux-gke-5.4*

ubuntu/linux-gkeop-5.4*

ubuntu/linux-hwe*

ubuntu/linux-hwe-edge*

ubuntu/linux-oem*

ubuntu/linux-oracle-5.0*

ubuntu/linux-oracle-5.3*

ubuntu/linux-aws-5.11*

ubuntu/linux-aws-5.13*

ubuntu/linux-aws-5.8*

ubuntu/linux-azure-5.11*

ubuntu/linux-azure-5.13*

ubuntu/linux-azure-5.8*

ubuntu/linux-azure-fde*

ubuntu/linux-gcp-5.11*

ubuntu/linux-gcp-5.13*

ubuntu/linux-gcp-5.8*

ubuntu/linux-gke*

ubuntu/linux-gke-5.15*

ubuntu/linux-gkeop*

ubuntu/linux-gkeop-5.15*

ubuntu/linux-hwe-5.11*

ubuntu/linux-hwe-5.13*

ubuntu/linux-hwe-5.8*

ubuntu/linux-intel-5.13*

ubuntu/linux-oem-5.10*

ubuntu/linux-oem-5.13*

ubuntu/linux-oem-5.6*

ubuntu/linux-oracle-5.11*

ubuntu/linux-oracle-5.13*

ubuntu/linux-oracle-5.8*

ubuntu/linux-raspi2*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.11*

ubuntu/linux-riscv-5.8*

ubuntu/linux-allwinner-5.19*

ubuntu/linux-aws-5.19*

ubuntu/linux-aws-6.2*

ubuntu/linux-aws-6.5*

ubuntu/linux-aws-6.8*

ubuntu/linux-azure-5.19*

ubuntu/linux-azure-6.2*

ubuntu/linux-azure-6.5*

ubuntu/linux-azure-6.8*

ubuntu/linux-azure-fde-5.19*

ubuntu/linux-azure-fde-6.2*

ubuntu/linux-azure-fde-6.8*

ubuntu/linux-gcp-5.19*

ubuntu/linux-gcp-6.2*

ubuntu/linux-gcp-6.5*

ubuntu/linux-gcp-6.8*

ubuntu/linux-hwe-5.19*

ubuntu/linux-hwe-6.2*

ubuntu/linux-hwe-6.5*

ubuntu/linux-ibm-6.8*

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

ubuntu/linux-lowlatency-hwe-6.8*

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

ubuntu/linux-nvidia-6.8*

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle-6.5*

ubuntu/linux-oracle-6.8*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-5.19*

ubuntu/linux-riscv-6.5*

ubuntu/linux-riscv-6.8*

ubuntu/linux-starfive-5.19*

ubuntu/linux-starfive-6.2*

ubuntu/linux-starfive-6.5*

ubuntu/linux-realtime-6.8*

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-aws-6.14*

ubuntu/linux-aws-6.17*

ubuntu/linux-aws-7.0*

ubuntu/linux-azure*

ubuntu/linux-azure-6.11*

ubuntu/linux-azure-6.14*

ubuntu/linux-azure-6.17*

ubuntu/linux-azure-7.0*

ubuntu/linux-azure-fde*

ubuntu/linux-azure-fde-6.14*

ubuntu/linux-azure-fde-6.17*

ubuntu/linux-azure-fde-7.0*

ubuntu/linux-azure-nvidia*

ubuntu/linux-azure-nvidia-6.14*

ubuntu/linux-gcp*

ubuntu/linux-gcp-6.11*

ubuntu/linux-gcp-6.14*

ubuntu/linux-gcp-7.0*

ubuntu/linux-gke*

ubuntu/linux-gkeop*

ubuntu/linux-hwe-6.11*

ubuntu/linux-hwe-6.14*

ubuntu/linux-hwe-6.17*

ubuntu/linux-hwe-7.0<7.0.0-42.42~24.04.1

7.0.0-42.42~24.04.1

ubuntu/linux-ibm*

ubuntu/linux-lowlatency*

ubuntu/linux-lowlatency-hwe-6.11*

ubuntu/linux-nvidia*

ubuntu/linux-nvidia-6.11*

ubuntu/linux-nvidia-6.17*

ubuntu/linux-nvidia-7.0*

ubuntu/linux-nvidia-lowlatency*

ubuntu/linux-nvidia-tegra*

ubuntu/linux-oem-6.11*

ubuntu/linux-oem-6.14*

ubuntu/linux-oem-6.17*

ubuntu/linux-oem-6.8*

ubuntu/linux-oracle*

ubuntu/linux-oracle-6.14*

ubuntu/linux-oracle-6.17*

ubuntu/linux-oracle-7.0*

ubuntu/linux-raspi*

ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-6.14*

ubuntu/linux-riscv-6.17*

ubuntu/linux-riscv-7.0<7.0.0-42.42.1~24.04.1

7.0.0-42.42.1~24.04.1

ubuntu/linux-vmware*

ubuntu/linux-xilinx*

ubuntu/linux-bluefield*

ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime*

ubuntu/linux-realtime-6.14*

ubuntu/linux-realtime-6.17*

ubuntu/linux-aws-fips*

ubuntu/linux-azure-fips*

ubuntu/linux-fips*

ubuntu/linux-gcp-fips*

ubuntu/linux<7.0.0-42.42

7.0.0-42.42

ubuntu/linux-aws<7.0.0-1016.17

7.0.0-1016.17

ubuntu/linux-azure*

ubuntu/linux-azure-fde*

ubuntu/linux-gcp<7.0.0-1016.18

7.0.0-1016.18

ubuntu/linux-gke*

ubuntu/linux-ibm<7.0.0-1017.17

7.0.0-1017.17

ubuntu/linux-nvidia*

ubuntu/linux-nvidia-bos*

ubuntu/linux-oem-7.0<7.0.0-1017.17

7.0.0-1017.17

ubuntu/linux-oracle<7.0.0-1015.16

7.0.0-1015.16

ubuntu/linux-raspi*

ubuntu/linux-realtime*

ubuntu/linux-riscv<7.0.0-42.42.1

7.0.0-42.42.1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade ubuntu/linux-hwe-7.0 to a version that resolves this vulnerability.
Fixed in 7.0.0-42.42~24.04.1
Upgrade
Upgrade ubuntu/linux-riscv-7.0 to a version that resolves this vulnerability.
Fixed in 7.0.0-42.42.1~24.04.1
Upgrade
Upgrade ubuntu/linux to a version that resolves this vulnerability.
Fixed in 7.0.0-42.42
Upgrade
Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.
Fixed in 7.0.0-1016.17
Upgrade
Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.
Fixed in 7.0.0-1016.18
Upgrade
Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.
Fixed in 7.0.0-1017.17
Upgrade
Upgrade ubuntu/linux-oem-7.0 to a version that resolves this vulnerability.
Fixed in 7.0.0-1017.17
Upgrade
Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.
Fixed in 7.0.0-1015.16
Upgrade
Upgrade ubuntu/linux-riscv to a version that resolves this vulnerability.
Fixed in 7.0.0-42.42.1
Configuration
Set the links' wcid pointers to NULL for an MLD in mt7925_sta_pre_rcu_remove() to prevent mt76_rx_poll_complete from accessing a removed STA.
Linux kernel mt76 mt792x links' wcid pointers for an MLD = NULL

Event History

Sep 17, 2026

CVE Published

via OSV·05:17 PM

Data Sourced

via OSV·05:17 PM

DescriptionSeverityAffected Software

Frequently Asked Questions

Which systems are most likely exposed?

Systems running one of the listed Ubuntu kernel packages and using the affected MediaTek mt76/mt792x Wi-Fi driver are the relevant exposure set. The issue occurs in receive processing after a station has been removed.

Does exploitation require an authenticated local user or user interaction?

The supplied CVSS vector indicates no privileges and no user interaction are required, with adjacent-network attack vector access. Attack conditions are described as a race between station removal and receive processing.

What is the impact if the race is triggered?

The race can cause a use-after-free in mt76_rx_poll_complete, producing invalid memory access during Wi-Fi receive polling. The provided severity vector rates confidentiality, integrity, and availability impact as high.

How can administrators recognize a possible occurrence?

A kernel report may show KASAN invalid-access errors in mt76_rx_poll_complete, with call-trace entries such as mt76_dma_rx_poll, mt792x_poll_rx, and napi_threaded_poll.

UBUNTU-CVE-2026-90380: Use After Free

Affected Software

Remediation

Event History

Frequently Asked Questions

Which systems are most likely exposed?

Does exploitation require an authenticated local user or user interaction?

What is the impact if the race is triggered?

How can administrators recognize a possible occurrence?

Company

Resources

Contact

Frequently Asked Questions

Which systems are most likely exposed?

Does exploitation require an authenticated local user or user interaction?

What is the impact if the race is triggered?

How can administrators recognize a possible occurrence?