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Vulnerability · Published Dec 4, 2025 · Assigned by Linux

CVE-2025-40266KVM: arm64: Check the untrusted offset in FF-A memory share

High 8.2

In plain English

A high-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 5% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.2High
Exploit odds (30 days)0.2%top 94.9% 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: KVM: arm64: Check the untrusted offset in FF-A memory share Verify the offset to prevent OOB access in the hypervisor FF-A buffer in case an untrusted large enough value [U32_MAX - sizeof(struct ffa_composite_mem_region) + 1, U32_MAX] is set from the host kernel.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linuxno fix listedDEBIAN-CVE-2025-40266
Debian:13linux6.12.63-1DEBIAN-CVE-2025-40266
Debian:14linux6.17.10-1DEBIAN-CVE-2025-40266
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux6.8.0-106.106UBUNTU-CVE-2025-40266
Ubuntu:25.10linux6.17.0-19.19USN-8094-1
Ubuntu:25.10linux6.17.0-19.19UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-aws6.8.0-1050.53UBUNTU-CVE-2025-40266
Ubuntu:25.10linux-aws6.17.0-1009.9USN-8094-1
Ubuntu:25.10linux-aws6.17.0-1009.9UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-aws-6.176.17.0-1009.9~24.04.2UBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-aws-6.176.17.0-1009.9~24.04.2USN-8094-1
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1050.53~22.04.1UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-azure6.8.0-1051.57UBUNTU-CVE-2025-40266
Ubuntu:25.10linux-azure6.17.0-1010.10USN-8094-4
Ubuntu:25.10linux-azure6.17.0-1010.10UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-azure-6.176.17.0-1010.10~24.04.1USN-8094-4
Ubuntu:24.04:LTSlinux-azure-6.176.17.0-1010.10~24.04.1UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1051.57~22.04.1UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-azure-fde6.8.0-1058.65UBUNTU-CVE-2025-40266
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-azure-fde-6.86.8.0-1058.65~22.04.1UBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-gcp6.8.0-1052.55UBUNTU-CVE-2025-40266
Ubuntu:25.10linux-gcp6.17.0-1009.9USN-8094-1
Ubuntu:25.10linux-gcp6.17.0-1009.9UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-gcp-6.176.17.0-1009.9~24.04.3UBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-gcp-6.176.17.0-1009.9~24.04.3USN-8094-2
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1052.55~22.04.1UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-gke6.8.0-1048.53UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1035.38UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-hwe-6.176.17.0-19.19~24.04.2USN-8094-1
Ubuntu:24.04:LTSlinux-hwe-6.176.17.0-19.19~24.04.2UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-106.106~22.04.1UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-ibm6.8.0-1049.49UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1049.49~22.04.1UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-106.106.1UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-106.106.1~22.04.1UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1049.52UBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-nvidia-6.176.17.0-1018.18UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1049.52~22.04.1UBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1049.52.1UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1020.20UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-oem-6.176.17.0-1017.17UBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-oem-6.176.17.0-1017.17USN-8152-1
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-oracle6.8.0-1047.48UBUNTU-CVE-2025-40266
Ubuntu:25.10linux-oracle6.17.0-1009.9USN-8094-1
Ubuntu:25.10linux-oracle6.17.0-1009.9UBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-oracle-6.176.17.0-1009.9~24.04.1UBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-oracle-6.176.17.0-1009.9~24.04.1USN-8094-1
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1047.48~22.04.1UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-raspi6.8.0-1050.54UBUNTU-CVE-2025-40266
Ubuntu:25.10linux-raspi6.17.0-1010.10USN-8094-5
Ubuntu:25.10linux-raspi6.17.0-1010.10UBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-40266
Ubuntu:25.10linux-realtime6.17.0-1008.9USN-8094-2
Ubuntu:25.10linux-realtime6.17.0-1008.9UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-40266
Ubuntu:25.10linux-riscv6.17.0-19.19.1UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-riscv-6.176.17.0-19.19.1~24.04.1UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-riscv-6.86.8.0-106.106~22.04.1UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2025-40266
Ubuntu:24.04:LTSlinux-xilinx6.8.0-1028.29UBUNTU-CVE-2025-40266
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2025-40266

Affected products (as reported)

VendorProductVersions
Linux Linux 6211753fdfd05af9e08f54c8d0ba3ee516034878 – before fc3139d9f4c1fe1c7d5f25f99676bd8e9c6a10416211753fdfd05af9e08f54c8d0ba3ee516034878 – before bc1909ef38788f2ee3d8011d70bf0299484330516211753fdfd05af9e08f54c8d0ba3ee516034878 – before f9f1aed6c8a3427900da3121e1868124854569c36211753fdfd05af9e08f54c8d0ba3ee516034878 – before 103e17aac09cdd358133f9e00998b75d6c1f1518
Linux Linux 3.11

References