Skip to content
Fencer Vulns
high 7.5

CVE-2023-32247 json

Session setup memory exhaustion denial-of-service vulnerability

published 2023-07-24 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-36504

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.9%
EPSS 3.9% chance of exploitation in 30 days, percentile 90%
public exploits
0
none known

Summary

A flaw was found in the Linux kernel's ksmbd, a high-performance in-kernel SMB server. The specific flaw exists within the handling of SMB2_SESSION_SETUP commands. The issue results from the lack of control of resource consumption. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.

Patch / fix

  • linux linux_kernel 5.15.145, 6.1.29, 6.2.16, 6.3.2
  • linux Debian 12 6.1.37-1
  • linux Debian 14, Debian 13 6.3.7-1

debian advisories DEBIAN-CVE-2023-32247

  • linux Ubuntu 22.04 LTS 5.15.0-101.111
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1056.61
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1054.62
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1053.58
  • linux-ibm Ubuntu 22.04 LTS 5.15.0-1049.52
  • linux-kvm Ubuntu 22.04 LTS 5.15.0-1053.58
  • linux-azure Ubuntu 22.04 LTS 5.15.0-1059.67
  • linux-gkeop Ubuntu 22.04 LTS 5.15.0-1039.45

ubuntu advisories UBUNTU-CVE-2023-32247

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • hyperv-daemons CBL-Mariner 2.0 5.15.145.2-1
  • kernel CBL-Mariner 2.0 5.15.126.1-1

azure linux advisories AZL-27643AZL-27765

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-32247 updated cvss 7.5

kernel: ksmbd: session setup memory exhaustion denial-of-service vulnerability

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.87% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • n/a kernel
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Fedora Fedora

Classification

Weakness
  • CWE-401 Missing Release of Memory after Effective Lifetime
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.