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Vulnerability · Published Aug 16, 2025 · Assigned by Linux

CVE-2023-32249ksmbd: not allow guest user on multichannel

Critical 9.1

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 31% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)9.1Critical
Exploit odds (30 days)0.4%top 68.6% 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: not allow guest user on multichannel This patch return STATUS_NOT_SUPPORTED if binding session is guest.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12linux6.1.37-1DEBIAN-CVE-2023-32249
Debian:13linux6.3.7-1DEBIAN-CVE-2023-32249
Debian:14linux6.3.7-1DEBIAN-CVE-2023-32249
Ubuntu:22.04:LTSlinux5.15.0-83.92UBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-aws5.15.0-1044.49UBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-azure5.15.0-1046.53UBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2023-32249
Ubuntu:24.04:LTSlinux-azure-6.11no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1046.53.1UBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-gcp5.15.0-1041.49UBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2023-32249
Ubuntu:24.04:LTSlinux-gcp-6.11no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-gke5.15.0-1041.46UBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1027.32UBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2023-32249
Ubuntu:24.04:LTSlinux-hwe-6.11no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-ibm5.15.0-1037.40UBUNTU-CVE-2023-32249
Ubuntu:24.04:LTSlinux-intelno fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1039.45UBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-kvm5.15.0-1041.46UBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-83.92UBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2023-32249
Ubuntu:24.04:LTSlinux-lowlatency-hwe-6.11no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1032.32UBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-nvidia-6.5no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1017.17UBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1004.4UBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2023-32249
Ubuntu:24.04:LTSlinux-oem-6.8no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-oracle5.15.0-1042.48UBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-raspi5.15.0-1037.40UBUNTU-CVE-2023-32249
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-32249
Ubuntu:24.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2023-32249
Ubuntu:24.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2023-32249
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1025.29UBUNTU-CVE-2023-32249

Affected products (as reported)

VendorProductVersions
Linux Linux f5a544e3bab78142207e0242d22442db85ba1eff – before ed76d3a8910be06cd4e4ba63bf6075bf903945a1f5a544e3bab78142207e0242d22442db85ba1eff – before 1f0490586544455e5be698be2e6c30077b4ec461f5a544e3bab78142207e0242d22442db85ba1eff – before 4a98e859c4673013385a54084e0cd865695ca072f5a544e3bab78142207e0242d22442db85ba1eff – before 088131b7b01099720a528a72005ff17868705d40f5a544e3bab78142207e0242d22442db85ba1eff – before 3353ab2df5f68dab7da8d5ebb427a2d265a1f2b2
Linux Linux 5.15

References