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Vulnerability · Published May 20, 2025 · Assigned by Linux

CVE-2025-37924ksmbd: fix use-after-free in kerberos authentication

Critical 9.8

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 24.5% (higher than 98% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)24.5%top 2.1% 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 kerberos authentication Setting sess->user = NULL was introduced to fix the dangling pointer created by ksmbd_free_user. However, it is possible another thread could be operating on the session and make use of sess->user after it has been passed to ksmbd_free_user but before sess->user is set to NULL.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.140-1DSA-5925-1
Debian:12linux6.1.140-1DEBIAN-CVE-2025-37924
Debian:13linux6.12.29-1DEBIAN-CVE-2025-37924
Debian:14linux6.12.29-1DEBIAN-CVE-2025-37924
Ubuntu:22.04:LTSlinux5.15.0-185.195UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux5.15.0-185.195USN-8493-1
Ubuntu:24.04:LTSlinux6.8.0-100.100UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-aws5.15.0-1111.118UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-aws5.15.0-1111.118USN-8493-1
Ubuntu:24.04:LTSlinux-aws6.8.0-1046.49UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2025-37924
Ubuntu:24.04:LTSlinux-aws-6.146.14.0-1009.9~24.04.1USN-7665-2
Ubuntu:24.04:LTSlinux-aws-6.146.14.0-1009.9~24.04.1UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1046.49~22.04.1UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-azure5.15.0-1116.125UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-azure5.15.0-1116.125USN-8493-1
Ubuntu:24.04:LTSlinux-azure6.8.0-1046.52UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2025-37924
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1051.57~22.04.1UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1116.125UBUNTU-CVE-2025-37924
Ubuntu:24.04:LTSlinux-azure-fde6.8.0-1046.53UBUNTU-CVE-2025-37924
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-azure-fde-6.86.8.0-1046.53~22.04.1UBUNTU-CVE-2025-37924
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-gcp5.15.0-1111.121USN-8493-1
Ubuntu:22.04:LTSlinux-gcp5.15.0-1111.121UBUNTU-CVE-2025-37924
Ubuntu:24.04:LTSlinux-gcp6.8.0-1047.50UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2025-37924
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2025-37924
Ubuntu:24.04:LTSlinux-gcp-6.146.14.0-1011.11~24.04.1UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1047.50~22.04.2UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-gke5.15.0-1107.113UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-gke5.15.0-1107.113USN-8493-1
Ubuntu:24.04:LTSlinux-gke6.8.0-1043.48UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1094.102UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1094.102USN-8493-1
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1030.33UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2025-37924
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-100.100~22.04.1UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-ibm5.15.0-1105.109UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-ibm5.15.0-1105.109USN-8493-1
Ubuntu:24.04:LTSlinux-ibm6.8.0-1044.44UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1044.44~22.04.1UBUNTU-CVE-2025-37924
Ubuntu:24.04:LTSlinux-intelno fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1106.112USN-8493-1
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1106.112UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-kvm5.15.0-1103.108USN-8493-1
Ubuntu:22.04:LTSlinux-kvm5.15.0-1103.108UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-183.193UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-183.193USN-8493-1
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-100.100.1UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2025-37924
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-100.100.1~22.04.1UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1106.107UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1106.107USN-8493-1
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1046.49UBUNTU-CVE-2025-37924
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1046.49~22.04.1UBUNTU-CVE-2025-37924
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1046.49.1UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1063.63UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1063.63USN-8493-1
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1020.20UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1052.52UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1052.52USN-8493-1
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2025-37924
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2025-37924
Ubuntu:24.04:LTSlinux-oem-6.146.14.0-1007.7UBUNTU-CVE-2025-37924
Ubuntu:24.04:LTSlinux-oem-6.146.14.0-1007.7USN-7650-1
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2025-37924
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-oracle5.15.0-1108.114UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-oracle5.15.0-1108.114USN-8493-1
Ubuntu:24.04:LTSlinux-oracle6.8.0-1043.44UBUNTU-CVE-2025-37924
Ubuntu:24.04:LTSlinux-oracle-6.146.14.0-1009.9~24.04.1UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1043.44~22.04.1UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-raspi5.15.0-1105.108UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-raspi5.15.0-1105.108USN-8527-1
Ubuntu:24.04:LTSlinux-raspi6.8.0-1047.51UBUNTU-CVE-2025-37924
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-37924
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-37924
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2025-37924
Ubuntu:24.04:LTSlinux-riscv-6.146.14.0-24.24.1~24.04.1UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-riscv-6.86.8.0-100.100~22.04.1UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2025-37924
Ubuntu:24.04:LTSlinux-xilinx6.8.0-1023.24UBUNTU-CVE-2025-37924
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1074.78USN-8528-1
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1074.78UBUNTU-CVE-2025-37924

Affected products (as reported)

VendorProductVersions
Linux Linux 0626e6641f6b467447c81dd7678a69c66f7746cf – before e34a33d5d7e87399af0a138bb32f6a3e95dd83d20626e6641f6b467447c81dd7678a69c66f7746cf – before b447463562238428503cfba1c913261047772f900626e6641f6b467447c81dd7678a69c66f7746cf – before e18c616718018dfc440e4a2d2b94e28fe91b18610626e6641f6b467447c81dd7678a69c66f7746cf – before 28c756738af44a404a91b77830d017bb0c5258900626e6641f6b467447c81dd7678a69c66f7746cf – before e86e9134e1d1c90a960dd57f59ce574d27b9a124
Linux Linux 5.15

References