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Fencer Vulns
critical 9.1

CVE-2023-3867 in the critical feed json

ksmbd: fix out of bounds read in smb2_sess_setup

published 2025-08-16 14 mo ago modified 2026-08-15 2 mo ago also EUVD-2023-44495

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
6.3%
EPSS 6.3% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

ksmbd: fix out of bounds read in smb2_sess_setup

ksmbd does not consider the case of that smb2 session setup is in compound request. If this is the second payload of the compound, OOB read issue occurs while processing the first payload in the smb2_sess_setup().

Patch / fix

  • Linux Linux 5.15.145, 6.1.40, 6.4.5, 6.5
  • linux Debian 12 6.1.52-1
  • linux Debian 14, Debian 13 6.4.11-1

debian advisories DEBIAN-CVE-2023-3867

  • linux Ubuntu 22.04 LTS 5.15.0-102.112
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1057.63
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1055.63
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1054.59
  • linux-ibm Ubuntu 22.04 LTS 5.15.0-1050.53
  • linux-kvm Ubuntu 22.04 LTS 5.15.0-1054.59
  • linux-azure Ubuntu 22.04 LTS 5.15.0-1060.69
  • linux-gkeop Ubuntu 22.04 LTS 5.15.0-1040.46

ubuntu advisories UBUNTU-CVE-2023-3867

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

  • kernel-azure SLE Module for Public Cloud 15 SP6, openSUSE Leap 15.6 6.4.0-150600.8.52.1
  • kernel-syms-azure SLE Module for Public Cloud 15 SP6, openSUSE Leap 15.6 6.4.0-150600.8.52.1
  • kernel-source-azure SLE Module for Public Cloud 15 SP6, openSUSE Leap 15.6 6.4.0-150600.8.52.1
  • kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.20.15.2
  • kernel-syms-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.20.15.1
  • kernel-source-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.20.15.2
  • kernel-coco SLE Module for Confidential Computing Technical Preview 15 SP6 6.4.0-15061.32.coco15sp6.1
  • kernel-syms-coco SLE Module for Confidential Computing Technical Preview 15 SP6 6.4.0-15061.32.coco15sp6.1

suse advisories SUSE-SU-2025:03634-1SUSE-SU-2025:03633-1SUSE-SU-2025:03602-1SUSE-SU-2025:03382-1SUSE-SU-2025:20739-1SUSE-SU-2025:20756-1

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-2023-3867 updated cvss 7.2

kernel: Out of bounds read in smb2_sess_setup

  • 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 Red Hat Enterprise Linux 10 kernel
    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

6.27% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
NVD 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected products

  • Linux Linux

Classification

Weakness
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.