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Vulnerability · Published Sep 17, 2025 · Assigned by Linux

CVE-2023-53356usb: gadget: u_serial: Add null pointer check in gserial_suspend

Medium 5.5

In plain English

A medium-severity null pointer dereference 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 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.2%top 91.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: u_serial: Add null pointer check in gserial_suspend Consider a case where gserial_disconnect has already cleared gser->ioport. And if gserial_suspend gets called afterwards, it will lead to accessing of gser->ioport and thus causing null pointer dereference. Avoid this by adding a null pointer check. Added a static spinlock to prevent gser->ioport from becoming null after the newly added null pointer check.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.52-1DEBIAN-CVE-2023-53356
Debian:13linux6.4.4-1DEBIAN-CVE-2023-53356
Debian:14linux6.4.4-1DEBIAN-CVE-2023-53356
Ubuntu:22.04:LTSlinux5.15.0-86.96UBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-aws5.15.0-1047.52UBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-azure5.15.0-1049.56UBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2023-53356
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1049.56.1UBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-gcp5.15.0-1044.52UBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2023-53356
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-gke5.15.0-1044.49UBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1030.35UBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2023-53356
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-ibm5.15.0-1040.43UBUNTU-CVE-2023-53356
Ubuntu:24.04:LTSlinux-intelno fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1043.49UBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-kvm5.15.0-1044.49UBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-86.95UBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2023-53356
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1037.37UBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1018.18UBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1005.5UBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2023-53356
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2023-53356
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-oracle5.15.0-1045.51UBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-raspi5.15.0-1040.43UBUNTU-CVE-2023-53356
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-53356
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2023-53356
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2023-53356
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1025.29UBUNTU-CVE-2023-53356

Affected products (as reported)

VendorProductVersions
Linux Linux aba3a8d01d623a5efef48ab8e78752d58d4c90c3 – before 2788a3553f7497075653210b42e2aeb6ba95e28eaba3a8d01d623a5efef48ab8e78752d58d4c90c3 – before a8ea7ed644cbf6314b5b0136b5398754b549fb8faba3a8d01d623a5efef48ab8e78752d58d4c90c3 – before e60a827ac074ce6bd58305fe5a86afab5fce6a04aba3a8d01d623a5efef48ab8e78752d58d4c90c3 – before 374447e3367767156405bedd230c5d391f4b7962aba3a8d01d623a5efef48ab8e78752d58d4c90c3 – before 2f6ecb89fe8feb2b60a53325b0eeb9866d88909a
Linux Linux 5.8

Weakness: CWE-476 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References