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In the Linux kernel, the following vulnerability has been resolved:
media: netup_unidvb: fix use-after-free at del_timer()
When Universal DVB card is detaching, netup_unidvb_dma_fini() uses del_timer() to stop dma->timeout timer. But when timer handler netup_unidvb_dma_timeout() is running, del_timer() could not stop it. As a result, the use-after-free bug could happen. The process is shown below:
(cleanup routine) | (timer routine) | mod_timer(&dev->tx_sim_timer, ..) netup_unidvb_finidev() | (wait a time) netup_unidvb_dma_fini() | netup_unidvb_dma_timeout() del_timer(&dma->timeout); | | ndev->pci_dev->dev //USE
Fix by changing del_timer() to del_timer_sync().
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Sep 17, 2025 | Sep 17, 2025 |
| Ubuntu | — | Upgrade linux-oracle-5.15Upgrade linux-gcpUpgrade linux-hwe-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-intel-iotg-5.15Upgrade linux-bluefieldUpgrade linux-raspi-5.4Upgrade linux-aws-fipsUpgrade linux-azure-fdeUpgrade linux-gcp-5.15Upgrade linux-nvidiaUpgrade linux-riscv-5.15Upgrade linux-realtimeUpgrade linux-aws-5.4Upgrade linux-gkeopUpgrade linux-ibmUpgrade linux-intel-iotgUpgrade linux-raspiUpgrade linux-oracleUpgrade linux-xilinx-zynqmpUpgrade linux-azureUpgrade linux-azure-5.15Upgrade linux-hwe-5.4Upgrade linux-fipsUpgrade linux-azure-5.4Upgrade linux-kvmUpgrade linux-gcp-fipsUpgrade linux-oracle-5.4Upgrade linux-nvidia-tegra-5.15Upgrade linux-ibm-5.4Upgrade linux-intel-iot-realtimeUpgrade linuxUpgrade linux-azure-fipsUpgrade linux-nvidia-tegra-igxUpgrade linux-gkeUpgrade linux-awsUpgrade linux-iotUpgrade linux-nvidia-tegraUpgrade linux-lowlatencyUpgrade linux-gcp-5.4Upgrade linux-aws-5.15Upgrade linux-ibm-5.15 | Sep 19, 2025 | Sep 16, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 15, 2025 | Sep 15, 2025 |
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