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Vulnerability · Published Jul 25, 2025 · Assigned by Linux

CVE-2025-38448usb: gadget: u_serial: Fix race condition in TTY wakeup

Medium 4.7

In plain English

A medium-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)4.7Medium
Exploit odds (30 days)0.1%top 96.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: u_serial: Fix race condition in TTY wakeup A race condition occurs when gs_start_io() calls either gs_start_rx() or gs_start_tx(), as those functions briefly drop the port_lock for usb_ep_queue(). This allows gs_close() and gserial_disconnect() to clear port.tty and port_usb, respectively. Use the null-safe TTY Port helper function to wake up TTY. Example CPU1: CPU2: gserial_connect() // lock gs_close() // await lock gs_start_rx() // unlock usb_ep_queue() gs_close() // lock, reset port.tty and unlock gs_start_rx() // lock tty_wakeup() // NPE

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.147-1DEBIAN-CVE-2025-38448
Debian:13linux6.12.41-1DSA-5975-1
Debian:13linux6.12.41-1DEBIAN-CVE-2025-38448
Debian:14linux6.16.3-1DEBIAN-CVE-2025-38448
Ubuntu:22.04:LTSlinux5.15.0-156.166UBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux6.8.0-100.100UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-aws5.15.0-1092.99UBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-aws6.8.0-1046.49UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-aws-6.146.14.0-1017.17~24.04.1USN-7879-3
Ubuntu:24.04:LTSlinux-aws-6.146.14.0-1017.17~24.04.1UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1046.49~22.04.1UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-azure5.15.0-1096.105UBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-azure6.8.0-1046.52UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-azure-6.146.14.0-1017.17~24.04.1USN-7934-1
Ubuntu:24.04:LTSlinux-azure-6.146.14.0-1017.17~24.04.1UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1051.57~22.04.1UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1096.105.1UBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-azure-fde6.8.0-1046.53UBUNTU-CVE-2025-38448
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-azure-fde-6.86.8.0-1046.53~22.04.1UBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-gcp5.15.0-1092.101UBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-gcp6.8.0-1047.50UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-gcp-6.146.14.0-1020.21~24.04.1USN-7879-4
Ubuntu:24.04:LTSlinux-gcp-6.146.14.0-1020.21~24.04.1UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1047.50~22.04.2UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-gke5.15.0-1089.95UBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-gke6.8.0-1043.48UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1075.83UBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1030.33UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-hwe-6.146.14.0-36.36~24.04.1USN-7879-1
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-100.100~22.04.1UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-ibm5.15.0-1086.89UBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-ibm6.8.0-1044.44UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1044.44~22.04.1UBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-intelno fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1087.93UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-kvm5.15.0-1088.93UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-156.166UBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-100.100.1UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-100.100.1~22.04.1UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1087.88UBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1046.49UBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1046.49~22.04.1UBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1046.49.1UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1045.45UBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1013.13UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1034.34UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-oem-6.146.14.0-1016.16UBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-oem-6.146.14.0-1016.16USN-7880-1
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-oracle5.15.0-1090.96UBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-oracle6.8.0-1043.44UBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-oracle-6.146.14.0-1017.17~24.04.1USN-7879-3
Ubuntu:24.04:LTSlinux-oracle-6.146.14.0-1017.17~24.04.1UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1043.44~22.04.1UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-raspi5.15.0-1086.89UBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-raspi6.8.0-1047.51UBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-riscv-6.146.14.0-36.36.1~24.04.1UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-riscv-6.86.8.0-100.100~22.04.1UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2025-38448
Ubuntu:24.04:LTSlinux-xilinx6.8.0-1023.24UBUNTU-CVE-2025-38448
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1056.60UBUNTU-CVE-2025-38448

Affected products (as reported)

VendorProductVersions
Linux Linux 35f95fd7f234d2b58803bab6f6ebd6bb988050a2 – before 18d58a467ccf011078352d91b4d6a0108c7318e835f95fd7f234d2b58803bab6f6ebd6bb988050a2 – before d43657b59f36e88289a6066f15bc9a80df5014eb35f95fd7f234d2b58803bab6f6ebd6bb988050a2 – before a5012673d49788f16bb4e375b002d7743eb642d935f95fd7f234d2b58803bab6f6ebd6bb988050a2 – before ee8d688e2ba558f3bb8ac225113740be5f33541735f95fd7f234d2b58803bab6f6ebd6bb988050a2 – before c6eb4a05af3d0ba3bc4e8159287722fb9abc635935f95fd7f234d2b58803bab6f6ebd6bb988050a2 – before abf3620cba68e0e51e5c21054ce4f925f75b366135f95fd7f234d2b58803bab6f6ebd6bb988050a2 – before c8c80a3a35c2e3488409de2d5376ef7e662a2bf535f95fd7f234d2b58803bab6f6ebd6bb988050a2 – before c529c3730bd09115684644e26bf01ecbd7e2c2c9
Linux Linux 3.5

References