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Vulnerability · Published Apr 2, 2025 · Assigned by Linux

CVE-2025-21994ksmbd: fix incorrect validation for num_aces field of smb_acl

High 7.6

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 0.3% (higher than 24% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.6High
Exploit odds (30 days)0.3%top 76.2% 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: ksmbd: fix incorrect validation for num_aces field of smb_acl parse_dcal() validate num_aces to allocate posix_ace_state_array. if (num_aces > ULONG_MAX / sizeof(struct smb_ace *)) It is an incorrect validation that we can create an array of size ULONG_MAX. smb_acl has ->size field to calculate actual number of aces in request buffer size. Use this to check invalid num_aces.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.133-1DEBIAN-CVE-2025-21994
Debian:13linux6.12.21-1DEBIAN-CVE-2025-21994
Debian:14linux6.12.21-1DEBIAN-CVE-2025-21994
Ubuntu:22.04:LTSlinux5.15.0-142.152UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux5.15.0-142.152USN-7591-1
Ubuntu:24.04:LTSlinux6.8.0-84.84UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-aws5.15.0-1086.93USN-7591-4
Ubuntu:22.04:LTSlinux-aws5.15.0-1086.93UBUNTU-CVE-2025-21994
Ubuntu:24.04:LTSlinux-aws6.8.0-1039.41UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1039.41~22.04.1UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-azure5.15.0-1091.100USN-7597-1
Ubuntu:22.04:LTSlinux-azure5.15.0-1091.100UBUNTU-CVE-2025-21994
Ubuntu:24.04:LTSlinux-azure6.8.0-1038.44UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2025-21994
Ubuntu:24.04:LTSlinux-azure-6.116.11.0-1018.18~24.04.1UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1036.42~22.04.1UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1091.100.1UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2025-21994
Ubuntu:24.04:LTSlinux-azure-nvidia6.8.0-1025.27UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-gcp5.15.0-1085.94UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-gcp5.15.0-1085.94USN-7591-1
Ubuntu:24.04:LTSlinux-gcp6.8.0-1040.42UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2025-21994
Ubuntu:24.04:LTSlinux-gcp-6.116.11.0-1016.16~24.04.1UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1040.42~22.04.1UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-gke5.15.0-1083.89USN-7591-1
Ubuntu:22.04:LTSlinux-gke5.15.0-1083.89UBUNTU-CVE-2025-21994
Ubuntu:24.04:LTSlinux-gke6.8.0-1036.40UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1068.76UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1068.76USN-7591-1
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1023.25UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2025-21994
Ubuntu:24.04:LTSlinux-hwe-6.116.11.0-28.28~24.04.1UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-85.85~22.04.1UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-ibm5.15.0-1078.81USN-7591-1
Ubuntu:22.04:LTSlinux-ibm5.15.0-1078.81UBUNTU-CVE-2025-21994
Ubuntu:24.04:LTSlinux-ibm6.8.0-1037.37UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1037.37~22.04.1UBUNTU-CVE-2025-21994
Ubuntu:24.04:LTSlinux-intelno fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1081.87USN-7591-5
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1081.87UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-kvm5.15.0-1082.87USN-7591-1
Ubuntu:22.04:LTSlinux-kvm5.15.0-1082.87UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-142.152USN-7591-1
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-142.152UBUNTU-CVE-2025-21994
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-84.84.1UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2025-21994
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.116.11.0-1015.16~24.04.2UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-84.84.1~22.04.1UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1080.81USN-7591-1
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1080.81UBUNTU-CVE-2025-21994
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1039.42UBUNTU-CVE-2025-21994
Ubuntu:24.04:LTSlinux-nvidia-6.116.11.0-1012.12UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1039.42~22.04.1UBUNTU-CVE-2025-21994
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1039.42.1UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1039.39USN-7591-1
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1039.39UBUNTU-CVE-2025-21994
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1010.10UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1028.28UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1028.28USN-7591-1
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2025-21994
Ubuntu:24.04:LTSlinux-oem-6.116.11.0-1024.24UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2025-21994
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-oracle5.15.0-1083.89USN-7591-1
Ubuntu:22.04:LTSlinux-oracle5.15.0-1083.89UBUNTU-CVE-2025-21994
Ubuntu:24.04:LTSlinux-oracle6.8.0-1037.38UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1037.38~22.04.1UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-raspi5.15.0-1080.83USN-7591-6
Ubuntu:22.04:LTSlinux-raspi5.15.0-1080.83UBUNTU-CVE-2025-21994
Ubuntu:24.04:LTSlinux-raspi6.8.0-1039.43UBUNTU-CVE-2025-21994
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-21994
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-21994
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-riscv-6.86.8.0-84.84~22.04.1UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2025-21994
Ubuntu:24.04:LTSlinux-xilinx6.8.0-1018.19UBUNTU-CVE-2025-21994
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1050.54UBUNTU-CVE-2025-21994

Affected products (as reported)

VendorProductVersions
Linux Linux 0626e6641f6b467447c81dd7678a69c66f7746cf – before c3a3484d9d31b27a3db0fab91fcf191132d652360626e6641f6b467447c81dd7678a69c66f7746cf – before 9c4e202abff45f8eac17989e549fc7a75095f6750626e6641f6b467447c81dd7678a69c66f7746cf – before d0f87370622a853b57e851f7d5a5452b72300f190626e6641f6b467447c81dd7678a69c66f7746cf – before a4cb17797a5d241f1e509cb5b46ed95a80c2f5fd0626e6641f6b467447c81dd7678a69c66f7746cf – before f6a6721802ac2f12f4c1bbe839a4c229b61866f20626e6641f6b467447c81dd7678a69c66f7746cf – before 1b8b67f3c5e5169535e26efedd3e422172e2db64
Linux Linux 5.15

References