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Vulnerability · Published Apr 16, 2025 · Assigned by Linux

CVE-2025-22040ksmbd: fix session use-after-free in multichannel connection

High 8.8

In plain English

A high-severity use-after-free 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 0.7% (higher than 53% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.7%top 46.5% 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: ksmbd: fix session use-after-free in multichannel connection There is a race condition between session setup and ksmbd_sessions_deregister. The session can be freed before the connection is added to channel list of session. This patch check reference count of session before freeing it.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.135-1DEBIAN-CVE-2025-22040
Debian:12linux6.1.135-1DSA-5907-1
Debian:13linux6.12.25-1DEBIAN-CVE-2025-22040
Debian:14linux6.12.25-1DEBIAN-CVE-2025-22040
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux6.8.0-86.87USN-7835-1
Ubuntu:24.04:LTSlinux6.8.0-86.87UBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-aws6.8.0-1041.43UBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-aws6.8.0-1041.43USN-7835-1
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1041.43~22.04.1USN-7835-6
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1041.43~22.04.1UBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-azure6.8.0-1041.47USN-7835-1
Ubuntu:24.04:LTSlinux-azure6.8.0-1041.47UBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-azure-6.116.11.0-1018.18~24.04.1UBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1041.47~22.04.1UBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1041.47~22.04.1USN-7835-1
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2025-22040
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-azure-nvidia6.8.0-1029.32USN-7940-2
Ubuntu:24.04:LTSlinux-azure-nvidia6.8.0-1029.32UBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-gcp6.8.0-1042.45UBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-gcp6.8.0-1042.45USN-7835-1
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-gcp-6.116.11.0-1016.16~24.04.1UBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1042.45~22.04.1USN-7835-3
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1042.45~22.04.1UBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-gke6.8.0-1038.43USN-7835-3
Ubuntu:24.04:LTSlinux-gke6.8.0-1038.43UBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1025.28UBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1025.28USN-7835-1
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-hwe-6.116.11.0-28.28~24.04.1UBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-86.87~22.04.1UBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-86.87~22.04.1USN-7835-4
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-ibm6.8.0-1039.39UBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-ibm6.8.0-1039.39USN-7835-1
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1039.39~22.04.1USN-7835-1
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1039.39~22.04.1UBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-intelno fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-86.87.1UBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-86.87.1USN-7835-1
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.116.11.0-1015.16~24.04.2UBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-86.87.1~22.04.1USN-7835-1
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-86.87.1~22.04.1UBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1041.44UBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1041.44USN-7835-3
Ubuntu:24.04:LTSlinux-nvidia-6.116.11.0-1012.12UBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1041.44~22.04.2USN-7835-3
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1041.44~22.04.2UBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1041.44.1USN-7835-3
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1041.44.1UBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1012.12UBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-oem-6.116.11.0-1024.24UBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-oracle6.8.0-1038.39UBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-oracle6.8.0-1038.39USN-7835-1
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1038.39~22.04.1UBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1038.39~22.04.1USN-7835-5
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-raspi6.8.0-1041.45USN-7887-2
Ubuntu:24.04:LTSlinux-raspi6.8.0-1041.45UBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-riscv-6.86.8.0-86.87~22.04.1UBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2025-22040
Ubuntu:24.04:LTSlinux-xilinx6.8.0-1018.19UBUNTU-CVE-2025-22040
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2025-22040

Affected products (as reported)

VendorProductVersions
Linux Linux 0626e6641f6b467447c81dd7678a69c66f7746cf – before 596407adb9af1ee75fe7c7529607783d31b66e7f0626e6641f6b467447c81dd7678a69c66f7746cf – before 3980770cb1470054e6400fd976686659757267370626e6641f6b467447c81dd7678a69c66f7746cf – before 9069939d762138e232a6f79e3e1462682ed6a17d0626e6641f6b467447c81dd7678a69c66f7746cf – before 94c281721d4ed2d972232414b91d98a6f5bdb16b0626e6641f6b467447c81dd7678a69c66f7746cf – before 7dfbd4c43eed91dd2548a95236908025707a8dfd0626e6641f6b467447c81dd7678a69c66f7746cf – before fa4cdb8cbca7d6cb6aa13e4d8d83d1103f6345db
Linux Linux 5.15

Weakness: CWE-416 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References