CVE-2025-21689 — USB: serial: quatech2: fix null-ptr-deref in qt2_process_read_urb()

Affected: Linux

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

USB: serial: quatech2: fix null-ptr-deref in qt2_process_read_urb()

This patch addresses a null-ptr-deref in qt2_process_read_urb() due to an incorrect bounds check in the following:

if (newport > serial->num_ports) { dev_err(&port->dev, "%s - port change to invalid port: %i\n", __func__, newport); break; }

The condition doesn't account for the valid range of the serial->port buffer, which is from 0 to serial->num_ports - 1. When newport is equal to serial->num_ports, the assignment of "port" in the following code is out-of-bounds and NULL:

serial_priv->current_port = newport; port = serial->port[serial_priv->current_port];

The fix checks if newport is greater than or equal to serial->num_ports indicating it is out-of-bounds.

USN-7387-1 — linux, linux-aws, linux-azure, linux-gcp, linux-gke, linux-gkeop, linux-ibm, linux-intel-iotg, linux-lowlatency, linux-…

Affected: Ubuntu:20.04:LTS: linux-lowlatency-hwe-5.15, Ubuntu:20.04:LTS: linux-oracle-5.15, Ubuntu:22.04:LTS: linux, Ubuntu:22.04:LTS: linux-aws, Ubuntu:22.04:LTS: linux-azure, Ubuntu:22.04:LTS: linux-gcp, Ubuntu:22.04:LTS: linux-gke, Ubuntu:22.04:LTS: linux-gkeop, Ubuntu:22.04:LTS: linux-ibm, Ubuntu:22.04:LTS: linux-intel-iotg and 4 more

Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - ARM64 architecture; - MIPS architecture; - PowerPC architecture; - RISC-V architecture; - S390 architecture; - SuperH RISC architecture; - User-Mode Linux (UML); - x86 architecture; - Block layer subsystem; - Cryptographic API; - ACPI drivers; - Drivers core; - RAM backed block device driver; - Virtio block driver; - Data acquisition framework and drivers; - Hardware crypto device drivers; - DMA engine subsystem; - EDAC drivers; - ARM SCPI message protocol; - GPIO subsystem; - GPU drivers; - HID subsystem; - Microsoft Hyper-V drivers; - I3C subsystem; - IIO ADC drivers; - IIO subsystem; - InfiniBand drivers; - IOMMU subsystem; - LED subsystem; - Multiple devices driver; - Media drivers; - Multifunction device drivers; - MMC subsystem; - MTD block device drivers; - Network drivers; - Mellanox network drivers; - Microsoft Azure Network Adapter (MANA) driver; - NVME drivers; - PCI subsystem; - Pin controllers subsystem; - x86 platform drivers; - Power supply drivers; - Real Time Clock drivers; - SCSI subsystem; - SuperH / SH-Mobile drivers; - i.MX SoC drivers; - QCOM SoC drivers; - SPI subsystem; - Media staging drivers; - UFS subsystem; - DesignWare USB3 driver; - USB Gadget drivers; - USB Seri…

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CVE-2025-21689 — USB: serial: quatech2: fix null-ptr-deref in qt2_process_read_urb()

USN-7387-1 — linux, linux-aws, linux-azure, linux-gcp, linux-gke, linux-gkeop, linux-ibm, linux-intel-iotg, linux-lowlatency, linux-…