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Vulnerability · Published Jan 13, 2026 · Assigned by Linux

CVE-2025-68817ksmbd: fix use-after-free in ksmbd_tree_connect_put under concurrency

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 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.4%top 60.9% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in ksmbd_tree_connect_put under concurrency Under high concurrency, A tree-connection object (tcon) is freed on a disconnect path while another path still holds a reference and later executes *_put()/write on it.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.162-1DEBIAN-CVE-2025-68817
Debian:13linux6.12.69-1DEBIAN-CVE-2025-68817
Debian:14linux6.18.3-1DEBIAN-CVE-2025-68817
Ubuntu:22.04:LTSlinux5.15.0-176.186USN-8180-1
Ubuntu:22.04:LTSlinux5.15.0-176.186UBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux6.8.0-110.110UBUNTU-CVE-2025-68817
Ubuntu:25.10linux6.17.0-22.22UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-aws5.15.0-1105.112UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-aws5.15.0-1105.112USN-8180-1
Ubuntu:24.04:LTSlinux-aws6.8.0-1052.55UBUNTU-CVE-2025-68817
Ubuntu:25.10linux-aws6.17.0-1012.12UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-aws-6.14no fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-aws-6.176.17.0-1012.12~24.04.1UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-aws-6.86.8.0-1052.55~22.04.1UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-azure5.15.0-1110.119USN-8180-3
Ubuntu:22.04:LTSlinux-azure5.15.0-1110.119UBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-azure6.8.0-1054.60UBUNTU-CVE-2025-68817
Ubuntu:25.10linux-azure6.17.0-1013.13UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-azure-6.14no fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-azure-6.176.17.0-1013.13~24.04.1UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-azure-6.86.8.0-1059.65~22.04.1UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1114.123UBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-azure-fde6.8.0-1058.65UBUNTU-CVE-2025-68817
Ubuntu:25.10linux-azure-fdeno fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-azure-fde-6.14no fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-azure-fde-6.86.8.0-1058.65~22.04.1UBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-azure-nvidiano fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-azure-nvidia-6.14no fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-gcp5.15.0-1105.114UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-gcp5.15.0-1105.114USN-8180-1
Ubuntu:24.04:LTSlinux-gcp6.8.0-1054.57UBUNTU-CVE-2025-68817
Ubuntu:25.10linux-gcp6.17.0-1012.12UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-gcp-6.14no fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-gcp-6.176.17.0-1012.12~24.04.1UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-gcp-6.86.8.0-1054.57~22.04.1UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-gke5.15.0-1101.107UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-gke5.15.0-1101.107USN-8180-1
Ubuntu:24.04:LTSlinux-gke6.8.0-1050.56UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1088.96UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1088.96USN-8180-1
Ubuntu:24.04:LTSlinux-gkeop6.8.0-1037.40UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-hwe-6.14no fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-hwe-6.176.17.0-22.22~24.04.1UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-hwe-6.86.8.0-110.110~22.04.1UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-ibm5.15.0-1099.102USN-8180-5
Ubuntu:22.04:LTSlinux-ibm5.15.0-1099.102UBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-ibm6.8.0-1051.51UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-ibm-6.86.8.0-1051.51~22.04.1UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1100.106UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1100.106USN-8180-3
Ubuntu:22.04:LTSlinux-kvm5.15.0-1097.102UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-kvm5.15.0-1097.102USN-8180-3
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-175.185UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-175.185USN-8180-1
Ubuntu:24.04:LTSlinux-lowlatency6.8.0-110.110.1UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.86.8.0-110.110.1~22.04.1UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1100.101UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1100.101USN-8180-1
Ubuntu:24.04:LTSlinux-nvidia6.8.0-1051.54UBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-nvidia-6.11no fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-nvidia-6.176.17.0-1018.18UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-nvidia-6.86.8.0-1051.54~22.04.1UBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-nvidia-lowlatency6.8.0-1051.54.1UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1057.57UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1057.57USN-8187-1
Ubuntu:24.04:LTSlinux-nvidia-tegra6.8.0-1022.22UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1046.46USN-8187-1
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1046.46UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-oem-6.11no fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-oem-6.14no fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-oem-6.176.17.0-1020.20UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-oracle5.15.0-1102.108USN-8180-1
Ubuntu:22.04:LTSlinux-oracle5.15.0-1102.108UBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-oracle6.8.0-1049.50UBUNTU-CVE-2025-68817
Ubuntu:25.10linux-oracle6.17.0-1011.11UBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-oracle-6.14no fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-oracle-6.176.17.0-1011.11~24.04.1UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-oracle-6.86.8.0-1049.50~22.04.1UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-raspi5.15.0-1099.102UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-raspi5.15.0-1099.102USN-8180-6
Ubuntu:24.04:LTSlinux-raspi6.8.0-1052.56UBUNTU-CVE-2025-68817
Ubuntu:25.10linux-raspi6.17.0-1013.13UBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2025-68817
Ubuntu:25.10linux-realtime6.17.0-1010.11UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2025-68817
Ubuntu:25.10linux-riscv6.17.0-22.22.1UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-riscv-6.14no fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-riscv-6.176.17.0-22.22.1~24.04.1UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-riscv-6.86.8.0-110.110~22.04.1UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2025-68817
Ubuntu:24.04:LTSlinux-xilinx6.8.0-1028.29UBUNTU-CVE-2025-68817
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1070.74USN-8275-1
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1070.74UBUNTU-CVE-2025-68817

Affected products (as reported)

VendorProductVersions
Linux Linux dd45db4d9bbc8f122a9b4db5ce94ae29fcf03d3c – before 446beed646b2e426dd53d27358365f8678e1dd017b58ee8d0b91359554cf219cd4f33872ea2afd66 – before d092de8a26c952379ded8e6b0bda31d89befac1a33b235a6e6ebe0f05f3586a71e8d281d00f71e2e – before d64977495e44855f2b28d8ce56107c963a7a50e433b235a6e6ebe0f05f3586a71e8d281d00f71e2e – before 21a3d01fc6db5129f81edb0ab7cb94fd758bcbea33b235a6e6ebe0f05f3586a71e8d281d00f71e2e – before 063cbbc6f595ea36ad146e1b7d2af820894beb2133b235a6e6ebe0f05f3586a71e8d281d00f71e2e – before b39a1833cc4a2755b02603eec3a71a85e9dff9265.15.145 – before 5.15.1996.1.71 – before 6.1.160
Linux Linux 6.6

References