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In the Linux kernel, the following vulnerability has been resolved:
platform/x86: dell-uart-backlight: fix serdev race
The dell_uart_bl_serdev_probe() function calls devm_serdev_device_open() before setting the client ops via serdev_device_set_client_ops(). This ordering can trigger a NULL pointer dereference in the serdev controller's receive_buf handler, as it assumes serdev->ops is valid when SERPORT_ACTIVE is set.
This is similar to the issue fixed in commit 5e700b384ec1 ("platform/chrome: cros_ec_uart: properly fix race condition") where devm_serdev_device_open() was called before fully initializing the device.
Fix the race by ensuring client ops are set before enabling the port via devm_serdev_device_open().
Note, serdev_device_set_baudrate() and serdev_device_set_flow_control() calls should be after the devm_serdev_device_open() call.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 23, 2026 | Jul 23, 2026 |
| Suse | — | Upgrade kernel-symsUpgrade kernel-obs-qaUpgrade kernel-develUpgrade kernel-defaultUpgrade kernel-devel-azureUpgrade kernel-kvmsmallUpgrade kernel-kvmsmall-develUpgrade kernel-default-extraUpgrade kernel-docsUpgrade kernel-zfcpdumpUpgrade kernel-64kb-develUpgrade kernel-macrosUpgrade kernel-docs-htmlUpgrade kernel-source-azureUpgrade kernel-azure-extraUpgrade kernel-kvmsmall-vdsoUpgrade kernel-azure-develUpgrade kernel-default-livepatchUpgrade kernel-sourceUpgrade kernel-64kb-extraUpgrade kernel-source-vanillaUpgrade kernel-azure-vdsoUpgrade kernel-64kbUpgrade kernel-default-develUpgrade kernel-default-vdsoUpgrade kernel-azure | Dec 5, 2025 | Dec 5, 2025 |
| Ubuntu | — | Upgrade linux-image-6.11.0-1014-oracle-64kUpgrade linux-image-6.11.0-1020-oemUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-gcp-64kUpgrade linux-image-azureUpgrade linux-image-raspiUpgrade linux-image-lowlatency-hwe-24.04Upgrade linux-image-6.11.0-1012-awsUpgrade linux-image-awsUpgrade linux-image-azure-fdeUpgrade linux-image-lowlatencyUpgrade linux-image-6.11.0-1013-azureUpgrade linux-image-6.11.0-1014-oracleUpgrade linux-image-6.11.0-1012-lowlatencyUpgrade linux-image-oracle-64kUpgrade linux-image-lowlatency-64kUpgrade linux-image-gcpUpgrade linux-image-6.11.0-1012-lowlatency-64kUpgrade linux-image-6.11.0-1011-raspiUpgrade linux-image-6.11.0-24-genericUpgrade linux-image-6.11.0-1013-azure-fdeUpgrade linux-image-genericUpgrade linux-image-6.11.0-24-generic-64kUpgrade linux-image-generic-64kUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-oracleUpgrade linux-image-oem-24.04bUpgrade linux-image-realtimeUpgrade linux-image-6.11.0-1013-gcpUpgrade linux-image-lowlatency-64k-hwe-24.04Upgrade linux-image-virtualUpgrade linux-image-6.11.0-1013-gcp-64kUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-6.11.0-1008-realtime | Apr 24, 2025 | Feb 12, 2025 |
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