Vulnerability · Published Oct 4, 2025 · Assigned by Linux

CVE-2025-39933smb: client: let recv_done verify data_offset, data_length and remaining_data_length

Critical 9.4

In plain English

A critical-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 28% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.4Critical
Exploit odds (30 days)0.3%top 71.5% 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: smb: client: let recv_done verify data_offset, data_length and remaining_data_length This is inspired by the related server fixes.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8bpftool4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:8kernel4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:9kernel5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-64k5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-64k-core5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-64k-debug5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-64k-debug-core5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-64k-debug-devel5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-64k-debug-devel-matched5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-64k-debug-modules5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-64k-debug-modules-core5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-64k-debug-modules-extra5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-64k-devel5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-64k-devel-matched5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-64k-modules5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-64k-modules-core5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-64k-modules-extra5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:10kernel-abi-stablelists6.12.0-124.35.1.el10_1ALSA-2026:2282
AlmaLinux:8kernel-abi-stablelists4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:9kernel-abi-stablelists5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-core4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:9kernel-core5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-cross-headers4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:9kernel-cross-headers5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-debug4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:9kernel-debug5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-debug-core4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:9kernel-debug-core5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-debug-devel4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:9kernel-debug-devel5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-debug-devel-matched5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-debug-modules4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:9kernel-debug-modules5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-debug-modules-core5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-debug-modules-extra4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:9kernel-debug-modules-extra5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-debug-uki-virt5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-devel4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:9kernel-devel5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-devel-matched5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:10kernel-doc6.12.0-124.35.1.el10_1ALSA-2026:2282
AlmaLinux:8kernel-doc4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:9kernel-doc5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-headers4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:9kernel-headers5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-modules4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:9kernel-modules5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-modules-core5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-modules-extra4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:9kernel-modules-extra5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-rt4.18.0-553.94.1.rt7.435.el8_10ALSA-2026:0760
AlmaLinux:9kernel-rt5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-rt-64k5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-rt-64k-core5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-rt-64k-debug5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-rt-64k-debug-core5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-rt-64k-debug-devel5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-rt-64k-debug-modules5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-rt-64k-debug-modules-core5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-rt-64k-debug-modules-extra5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-rt-64k-devel5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-rt-64k-modules5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-rt-64k-modules-core5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-rt-64k-modules-extra5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-rt-core4.18.0-553.94.1.rt7.435.el8_10ALSA-2026:0760
AlmaLinux:9kernel-rt-core5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-rt-debug4.18.0-553.94.1.rt7.435.el8_10ALSA-2026:0760
AlmaLinux:9kernel-rt-debug5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-rt-debug-core4.18.0-553.94.1.rt7.435.el8_10ALSA-2026:0760
AlmaLinux:9kernel-rt-debug-core5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-rt-debug-devel4.18.0-553.94.1.rt7.435.el8_10ALSA-2026:0760
AlmaLinux:9kernel-rt-debug-devel5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-rt-debug-modules4.18.0-553.94.1.rt7.435.el8_10ALSA-2026:0760
AlmaLinux:9kernel-rt-debug-modules5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-rt-debug-modules-core5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-rt-debug-modules-extra4.18.0-553.94.1.rt7.435.el8_10ALSA-2026:0760
AlmaLinux:9kernel-rt-debug-modules-extra5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-rt-devel4.18.0-553.94.1.rt7.435.el8_10ALSA-2026:0760
AlmaLinux:9kernel-rt-devel5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-rt-modules4.18.0-553.94.1.rt7.435.el8_10ALSA-2026:0760
AlmaLinux:9kernel-rt-modules5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-rt-modules-core5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-rt-modules-extra4.18.0-553.94.1.rt7.435.el8_10ALSA-2026:0760
AlmaLinux:9kernel-rt-modules-extra5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-tools4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:9kernel-tools5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-tools-libs4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:9kernel-tools-libs5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-tools-libs-devel4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:9kernel-tools-libs-devel5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-uki-virt5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-uki-virt-addons5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-zfcpdump4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:9kernel-zfcpdump5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-zfcpdump-core4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:9kernel-zfcpdump-core5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-zfcpdump-devel4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:9kernel-zfcpdump-devel5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-zfcpdump-devel-matched5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-zfcpdump-modules4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:9kernel-zfcpdump-modules5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9kernel-zfcpdump-modules-core5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8kernel-zfcpdump-modules-extra4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:9kernel-zfcpdump-modules-extra5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9libperf5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8perf4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:9perf5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:8python3-perf4.18.0-553.94.1.el8_10ALSA-2026:0759
AlmaLinux:9python3-perf5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9rtla5.14.0-611.24.1.el9_7ALSA-2026:0793
AlmaLinux:9rv5.14.0-611.24.1.el9_7ALSA-2026:0793
Debian:12linuxno fix listedDEBIAN-CVE-2025-39933
Debian:13linux6.12.115-2DEBIAN-CVE-2025-39933
Debian:14linux6.16.9-1DEBIAN-CVE-2025-39933
Rocky Linux:10kernel0:6.12.0-124.35.1.el10_1RLSA-2026:2282
Rocky Linux:8kernel0:4.18.0-553.94.1.el8_10RLSA-2026:0759
Rocky Linux:9kernel0:5.14.0-611.24.1.el9_7RLSA-2026:0793
Rocky Linux:8kernel-rt0:4.18.0-553.94.1.rt7.435.el8_10RLSA-2026:0760
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinuxno fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-awsno fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-aws-6.8no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-azureno fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-azure-6.8no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2025-39933
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-azure-fde-6.17no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-azure-fde-6.8no fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-gcp-6.8no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-hwe-6.8no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-ibm-6.8no fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-intelno fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.8no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-nvidia-6.8no fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-nvidia-lowlatencyno fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1035.38USN-8781-1
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1035.38UBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2025-39933
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2025-39933
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2025-39933

Affected products (as reported)

VendorProductVersions
Linux Linux f198186aa9bbd60fae7a2061f4feec614d880299 – before fdc23a47be015fba915c4f9dfd43c65ad4829a35f198186aa9bbd60fae7a2061f4feec614d880299 – before f23d5c6b7540ec9b1e73a8ea3b2ae9045248d728f198186aa9bbd60fae7a2061f4feec614d880299 – before 241e58de23e7c1bbb9bee526c17d9a0f2a90fbadf198186aa9bbd60fae7a2061f4feec614d880299 – before 581fb78e0388b78911b0c920e4073737090c8b5ff198186aa9bbd60fae7a2061f4feec614d880299 – before f57e53ea252363234f86674db475839e5b87102e
Linux Linux 4.16

References