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Vulnerability · Published May 20, 2025 · Assigned by Linux

CVE-2025-37899ksmbd: fix use-after-free in session logoff

High 8.8

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 0.9% (higher than 59% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.9%top 40.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack tooling1Public PoC

Official description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in session logoff The sess->user object can currently be in use by another thread, for example if another connection has sent a session setup request to bind to the session being free'd. The handler for that connection could be in the smb2_sess_setup function which makes use of sess->user.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.159-1DEBIAN-CVE-2025-37899
Debian:13linux6.12.29-1DEBIAN-CVE-2025-37899
Debian:14linux6.12.29-1DEBIAN-CVE-2025-37899
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux6.8.0-101.101UBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux6.8.0-101.101USN-8059-1
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-aws6.8.0-1047.50UBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-aws6.8.0-1047.50USN-8059-6
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-aws-6.146.14.0-1009.9~24.04.1UBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-aws-6.146.14.0-1009.9~24.04.1USN-7665-2
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1047.50~22.04.1UBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1047.50~22.04.1USN-8059-6
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-azure6.8.0-1051.57USN-8125-1
Ubuntu:24.04:LTSlinux-azure6.8.0-1051.57UBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1051.57~22.04.1UBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-azure-fde6.8.0-1058.65UBUNTU-CVE-2025-37899
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-azure-fde-6.86.8.0-1058.65~22.04.1UBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-gcp6.8.0-1048.51USN-8059-3
Ubuntu:24.04:LTSlinux-gcp6.8.0-1048.51UBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-gcp-6.146.14.0-1011.11~24.04.1UBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1048.51~22.04.1UBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1048.51~22.04.1USN-8059-3
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-gke6.8.0-1044.49UBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-gke6.8.0-1044.49USN-8059-3
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1031.34UBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1031.34USN-8059-1
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-101.101~22.04.1UBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-101.101~22.04.1USN-8059-1
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-ibm6.8.0-1045.45UBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-ibm6.8.0-1045.45USN-8059-6
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1045.45~22.04.1USN-8059-6
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1045.45~22.04.1UBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-intelno fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-101.101.1UBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-101.101.1USN-8059-1
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-101.101.1~22.04.1USN-8059-1
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-101.101.1~22.04.1UBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1047.50USN-8059-8
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1047.50UBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1047.50~22.04.1USN-8059-8
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1047.50~22.04.1UBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1047.50.1USN-8059-8
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1047.50.1UBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1020.20UBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-oem-6.146.14.0-1007.7USN-7650-1
Ubuntu:24.04:LTSlinux-oem-6.146.14.0-1007.7UBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-oracle6.8.0-1044.45USN-8059-1
Ubuntu:24.04:LTSlinux-oracle6.8.0-1044.45UBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-oracle-6.146.14.0-1009.9~24.04.1UBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1044.45~22.04.1UBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1044.45~22.04.1USN-8059-3
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-raspi6.8.0-1048.52USN-8059-1
Ubuntu:24.04:LTSlinux-raspi6.8.0-1048.52UBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-riscv-6.146.14.0-24.24.1~24.04.1UBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-riscv-6.86.8.0-101.101~22.04.1UBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2025-37899
Ubuntu:24.04:LTSlinux-xilinx6.8.0-1024.25USN-8059-6
Ubuntu:24.04:LTSlinux-xilinx6.8.0-1024.25UBUNTU-CVE-2025-37899
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2025-37899

Affected products (as reported)

VendorProductVersions
Linux Linux 0626e6641f6b467447c81dd7678a69c66f7746cf – before 931dc8a3670f71c45c0b1379ea4e92dafbda1aca0626e6641f6b467447c81dd7678a69c66f7746cf – before 70ad6455139e26e85f48f95d0e21f351c19093420626e6641f6b467447c81dd7678a69c66f7746cf – before d5ec1d79509b3ee01de02c236f096bc050221b7f0626e6641f6b467447c81dd7678a69c66f7746cf – before 02d16046cd11a5c037b28c12ffb818c56dd3ef430626e6641f6b467447c81dd7678a69c66f7746cf – before 2fc9feff45d92a92cd5f96487655d5be23fb7e2b
Linux Linux 5.15

References