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Vulnerability · Published Apr 1, 2025 · Assigned by Linux

CVE-2025-21945ksmbd: fix use-after-free in smb2_lock

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 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.5%top 55.3% 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 use-after-free in smb2_lock If smb_lock->zero_len has value, ->llist of smb_lock is not delete and flock is old one. It will cause use-after-free on error handling routine.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.133-1DEBIAN-CVE-2025-21945
Debian:13linux6.12.19-1DEBIAN-CVE-2025-21945
Debian:14linux6.12.19-1DEBIAN-CVE-2025-21945
Ubuntu:22.04:LTSlinuxno fix listedUBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux6.8.0-84.84USN-7764-1
Ubuntu:24.04:LTSlinux6.8.0-84.84UBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-awsno fix listedUBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-aws6.8.0-1039.41USN-7764-1
Ubuntu:24.04:LTSlinux-aws6.8.0-1039.41UBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1039.41~22.04.1UBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1039.41~22.04.1USN-7766-1
Ubuntu:22.04:LTSlinux-azureno fix listedUBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-azure6.8.0-1038.44UBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-azure-6.116.11.0-1018.18~24.04.1USN-7628-1
Ubuntu:24.04:LTSlinux-azure-6.116.11.0-1018.18~24.04.1UBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1036.42~22.04.1UBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-azure-fdeno fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-azure-nvidia6.8.0-1025.27UBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-gcpno fix listedUBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-gcp6.8.0-1040.42UBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-gcp6.8.0-1040.42USN-7764-1
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-gcp-6.116.11.0-1016.16~24.04.1UBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-gcp-6.116.11.0-1016.16~24.04.1USN-7605-1
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1040.42~22.04.1USN-7766-1
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1040.42~22.04.1UBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-gkeno fix listedUBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-gke6.8.0-1036.40UBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-gke6.8.0-1036.40USN-7764-1
Ubuntu:22.04:LTSlinux-gkeopno fix listedUBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1023.25USN-7764-1
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1023.25UBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-hwe-6.116.11.0-28.28~24.04.1USN-7605-1
Ubuntu:24.04:LTSlinux-hwe-6.116.11.0-28.28~24.04.1UBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-85.85~22.04.1USN-7801-1
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-84.84~22.04.1USN-7764-2
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-85.85~22.04.1UBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-ibmno fix listedUBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-ibm6.8.0-1037.37UBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1037.37~22.04.1UBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-intelno fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-intel-iotgno fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-kvmno fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-lowlatencyno fix listedUBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-84.84.1UBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-84.84.1USN-7764-1
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.116.11.0-1015.16~24.04.2USN-7605-2
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.116.11.0-1015.16~24.04.2UBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-84.84.1~22.04.1UBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-84.84.1~22.04.1USN-7764-1
Ubuntu:22.04:LTSlinux-nvidiano fix listedUBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1039.42UBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1039.42USN-7765-1
Ubuntu:24.04:LTSlinux-nvidia-6.116.11.0-1012.12UBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1039.42~22.04.1UBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1039.42~22.04.1USN-7765-1
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1039.42.1USN-7765-1
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1039.42.1UBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-nvidia-tegrano fix listedUBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1010.10UBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-nvidia-tegra-igxno fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-oem-6.116.11.0-1024.24UBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-oem-6.116.11.0-1024.24USN-7606-1
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-oracleno fix listedUBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-oracle6.8.0-1037.38UBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-oracle6.8.0-1037.38USN-7801-2
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1037.38~22.04.1UBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1037.38~22.04.1USN-7801-3
Ubuntu:22.04:LTSlinux-raspino fix listedUBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-raspi6.8.0-1039.43USN-7790-1
Ubuntu:24.04:LTSlinux-raspi6.8.0-1039.43UBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-riscv-6.86.8.0-84.84~22.04.1UBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2025-21945
Ubuntu:24.04:LTSlinux-xilinx6.8.0-1018.19UBUNTU-CVE-2025-21945
Ubuntu:22.04:LTSlinux-xilinx-zynqmpno fix listedUBUNTU-CVE-2025-21945

Affected products (as reported)

VendorProductVersions
Linux Linux 0626e6641f6b467447c81dd7678a69c66f7746cf – before 410ce35a2ed6d0e114132bba29af49b69880c8c70626e6641f6b467447c81dd7678a69c66f7746cf – before 8573571060ca466cbef2c6f03306b2cc7b8835060626e6641f6b467447c81dd7678a69c66f7746cf – before a0609097fd10d618aed4864038393dd75131289e0626e6641f6b467447c81dd7678a69c66f7746cf – before 636e021646cf9b52ddfea7c809b018e91f2188cb0626e6641f6b467447c81dd7678a69c66f7746cf – before 84d2d1641b71dec326e8736a749b7ee76a9599fc
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