Log in Start free

Vulnerability · Published Jul 28, 2025 · Assigned by Linux

CVE-2025-38481comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large

Medium 5.5

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 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.2%top 91.3% 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: comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large The handling of the `COMEDI_INSNLIST` ioctl allocates a kernel buffer to hold the array of `struct comedi_insn`, getting the length from the `n_insns` member of the `struct comedi_insnlist` supplied by the user. The allocation will fail with a WARNING and a stack dump if it is too large. Avoid that by failing with an `-EINVAL` error if the supplied `n_insns` value is unreasonable. Define the limit on the `n_insns` value in the `MAX_INSNS` macro. Set this to the same value as `MAX_SAMPLES` (65536), which is the maximum allowed sum of the values of the member `n` in the array of `struct comedi_insn`, and sensible comedi instructions will have an `n` of at least 1.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.147-1DEBIAN-CVE-2025-38481
Debian:13linux6.12.41-1DSA-5975-1
Debian:13linux6.12.41-1DEBIAN-CVE-2025-38481
Debian:14linux6.16.3-1DEBIAN-CVE-2025-38481
Ubuntu:22.04:LTSlinux5.15.0-163.173UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux5.15.0-163.173USN-7909-1
Ubuntu:24.04:LTSlinux6.8.0-100.100UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-aws5.15.0-1097.104USN-7909-1
Ubuntu:22.04:LTSlinux-aws5.15.0-1097.104UBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-aws6.8.0-1046.49UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2025-38481
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-2025-38481
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1046.49~22.04.1UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-azure5.15.0-1101.110UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-azure5.15.0-1101.110USN-7910-2
Ubuntu:24.04:LTSlinux-azure6.8.0-1046.52UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2025-38481
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-2025-38481
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1051.57~22.04.1UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1102.111.1UBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-azure-fde6.8.0-1046.53UBUNTU-CVE-2025-38481
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-azure-fde-6.86.8.0-1046.53~22.04.1UBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-gcp5.15.0-1097.106USN-7909-4
Ubuntu:22.04:LTSlinux-gcp5.15.0-1097.106UBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-gcp6.8.0-1047.50UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-gcp-6.146.14.0-1020.21~24.04.1UBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-gcp-6.146.14.0-1020.21~24.04.1USN-7879-4
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1047.50~22.04.2UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-gke5.15.0-1093.99USN-7909-4
Ubuntu:22.04:LTSlinux-gke5.15.0-1093.99UBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-gke6.8.0-1043.48UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1080.88UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1080.88USN-7909-4
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1030.33UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2025-38481
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-2025-38481
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-100.100~22.04.1UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-ibm5.15.0-1091.94USN-7909-1
Ubuntu:22.04:LTSlinux-ibm5.15.0-1091.94UBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-ibm6.8.0-1044.44UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1044.44~22.04.1UBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-intelno fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1092.98UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1092.98USN-7909-1
Ubuntu:22.04:LTSlinux-kvm5.15.0-1089.94UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-kvm5.15.0-1089.94USN-7933-1
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-163.173UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-163.173USN-7909-1
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-100.100.1UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-100.100.1~22.04.1UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1092.93USN-7909-1
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1092.93UBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1046.49UBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1046.49~22.04.1UBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1046.49.1UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1049.49USN-7909-1
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1049.49UBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1020.20UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1038.38UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1038.38USN-7909-1
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-oem-6.146.14.0-1016.16UBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-oem-6.146.14.0-1016.16USN-7880-1
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-oracle5.15.0-1094.100USN-7909-1
Ubuntu:22.04:LTSlinux-oracle5.15.0-1094.100UBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-oracle6.8.0-1043.44UBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-oracle-6.146.14.0-1017.17~24.04.1UBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-oracle-6.146.14.0-1017.17~24.04.1USN-7879-3
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1043.44~22.04.1UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-raspi5.15.0-1091.94USN-7909-5
Ubuntu:22.04:LTSlinux-raspi5.15.0-1091.94UBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-raspi6.8.0-1047.51UBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-riscv-6.146.14.0-36.36.1~24.04.1UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-riscv-6.86.8.0-100.100~22.04.1UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2025-38481
Ubuntu:24.04:LTSlinux-xilinx6.8.0-1023.24UBUNTU-CVE-2025-38481
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1061.65USN-7909-1
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1061.65UBUNTU-CVE-2025-38481

Affected products (as reported)

VendorProductVersions
Linux Linux ed9eccbe8970f6eedc1b978c157caf1251a896d4 – before 454d732dfd0aef7d7aa950c409215ca06d717e93ed9eccbe8970f6eedc1b978c157caf1251a896d4 – before c68257588e87f45530235701a42496b7e9e56adbed9eccbe8970f6eedc1b978c157caf1251a896d4 – before 69dc06b9514522de532e997a21d035cd29b0db44ed9eccbe8970f6eedc1b978c157caf1251a896d4 – before d4c73ce13f5b5a0fe0319f1f352ff602f0ace8e3ed9eccbe8970f6eedc1b978c157caf1251a896d4 – before c9d3d9667443caafa804cd07940aeaef8e53aa90ed9eccbe8970f6eedc1b978c157caf1251a896d4 – before 992d600f284e719242a434166e86c1999649b71ced9eccbe8970f6eedc1b978c157caf1251a896d4 – before e3b8322cc8081d142ee4c1a43e1d702bdba1ed76ed9eccbe8970f6eedc1b978c157caf1251a896d4 – before 08ae4b20f5e82101d77326ecab9089e110f224cc
Linux Linux 2.6.29

References