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Vulnerability · Published Aug 2, 2025 · Assigned by redhat

CVE-2023-32255Kernel: memory leak via ksmbd session setup request with unknown ntlmssp message type

Medium 5.3

In plain English

A medium-severity security flaw in linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 46% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.6%top 53.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A flaw was found in the Linux kernel's ksmbd component. A memory leak can occur if a client sends a session setup request with an unknown NTLMSSP message type, potentially leading to resource exhaustion.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.37-1DEBIAN-CVE-2023-32255
Debian:13linux6.3.7-1DEBIAN-CVE-2023-32255
Debian:14linux6.3.7-1DEBIAN-CVE-2023-32255
Ubuntu:22.04:LTSlinux5.15.0-79.86UBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-aws5.15.0-1042.47UBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-azure5.15.0-1045.52UBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2023-32255
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1045.52.1UBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-gcp5.15.0-1039.47UBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2023-32255
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-gke5.15.0-1039.44UBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1025.30UBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2023-32255
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-ibm5.15.0-1035.38UBUNTU-CVE-2023-32255
Ubuntu:24.04:LTSlinux-intelno fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1037.42UBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-kvm5.15.0-1039.44UBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-79.88UBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2023-32255
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1030.30UBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1016.16UBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1002.2UBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-oracle5.15.0-1040.46UBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-raspi5.15.0-1035.38UBUNTU-CVE-2023-32255
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-32255
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2023-32255
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2023-32255
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1025.29UBUNTU-CVE-2023-32255

Affected products (as reported)

VendorProductVersions
linux 0 – before 5.15.1116.0.0 – before 6.0.*6.1.0 – before 6.1.286.2.0 – before 6.2.156.3.0 – before 6.3.2
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat Enterprise Linux 9 see references

Weakness: CWE-772 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References