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Fencer Vulns
high 7.8

CVE-2023-5345 json

Use-after-free in Linux kernel's fs/smb/client component

published 2023-10-03 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-57662

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits
0
none known

Summary

A use-after-free vulnerability in the Linux kernel's fs/smb/client component can be exploited to achieve local privilege escalation.

In case of an error in smb3_fs_context_parse_param, ctx->password was freed but the field was not set to NULL which could lead to double free.

We recommend upgrading past commit e6e43b8aa7cd3c3af686caf0c2e11819a886d705.

Patch / fix

  • Linux Kernel 6.6
  • linux Debian 12 6.1.64-1
  • linux Debian 14, Debian 13 6.5.6-1

debian advisories DEBIAN-CVE-2023-5345

  • linux-azure Ubuntu 22.04 LTS 5.15.0-1054.62
  • linux-raspi Ubuntu 24.04 LTS 6.7.0-1001.1
  • linux-aws-6.2 Ubuntu 22.04 LTS 6.2.0-1016.16~22.04.1
  • linux-aws-6.5 Ubuntu 22.04 LTS 6.5.0-1010.10~22.04.1
  • linux-gcp-6.2 Ubuntu 22.04 LTS 6.2.0-1019.21~22.04.1
  • linux-hwe-6.2 Ubuntu 22.04 LTS 6.2.0-37.38~22.04.1
  • linux-oem-6.1 Ubuntu 22.04 LTS 6.1.0-1025.25
  • linux-oem-6.5 Ubuntu 22.04 LTS 6.5.0-1008.8

ubuntu advisories UBUNTU-CVE-2023-5345

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 RHEL 9 5.14.0-362.13.1.el9_3
  • rv RHEL 9 5.14.0-362.13.1.el9_3
  • perf RHEL 9 5.14.0-362.13.1.el9_3
  • rtla RHEL 9 5.14.0-362.13.1.el9_3
  • bpftool RHEL 9 7.2.0-362.13.1.el9_3
  • libperf RHEL 9 5.14.0-362.13.1.el9_3
  • kernel-rt RHEL 9 5.14.0-362.13.1.el9_3
  • kernel-64k RHEL 9 5.14.0-362.13.1.el9_3

red hat advisories RHSA-2023:7749RHSA-2023:7734

  • dtb-aarch64 openSUSE Leap 15.5 5.14.21-150500.55.31.1
  • kernel-64kb SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.31.1
  • kernel-syms SLE Module for Development Tools 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.31.1
  • kernel-obs-qa openSUSE Leap 15.5 5.14.21-150500.55.31.1
  • kernel-source SLE Module for Development Tools 15 SP5, SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.31.1
  • kernel-default SLE Workstation Extension 15 SP5, SLE Module for Legacy 15 SP5, SLE Module for Basesystem 15 SP5 +4 more 5.14.21-150500.55.31.1
  • kernel-kvmsmall openSUSE Leap 15.5 5.14.21-150500.55.31.1
  • kernel-zfcpdump SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.31.1

suse advisories SUSE-SU-2023:4872-1SUSE-SU-2023:4863-1SUSE-SU-2023:4848-1SUSE-SU-2023:4841-1SUSE-SU-2023:4822-1SUSE-SU-2023:4805-1

  • kernel-source openSUSE Tumbleweed 6.5.6-1.1
  • kernel-source openSUSE Tumbleweed 6.6.17-1.1

opensuse advisories openSUSE-SU-2024:13305-1openSUSE-SU-2024:13704-1

  • kernel Rocky Linux 9 5.14.0-362.13.1.el9_3.cloud.0.3

rocky linux advisories RXSA-2023:7749

  • kernel CBL-Mariner 2.0 5.15.135.1-2
  • hyperv-daemons CBL-Mariner 2.0 5.15.135.1-1

azure linux advisories AZL-31149AZL-31730

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-2023-5345 updated cvss 7.8

kernel: use-after-free vulnerability in the smb client component

  • Red Hat CodeReady Linux Builder (v. 9) libperf 5.14.0-362.13.1.el9_3, kernel-debuginfo-common-s390x 5.14.0-362.13.1.el9_3, kernel-debuginfo-common-x86_64 5.14.0-362.13.1.el9_3, kernel-debuginfo-common-aarch64 5.14.0-362.13.1.el9_3, kernel-debuginfo-common-ppc64le 5.14.0-362.13.1.el9_3 Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-362.13.1.el9_3, perf 5.14.0-362.13.1.el9_3, rtla 5.14.0-362.13.1.el9_3, kernel-devel-matched 5.14.0-362.13.1.el9_3, kernel-64k-devel-matched 5.14.0-362.13.1.el9_3, kernel-debug-devel-matched 5.14.0-362.13.1.el9_3, +6 more Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.2.0-362.13.1.el9_3, kernel 5.14.0-362.13.1.el9_3, kernel-64k 5.14.0-362.13.1.el9_3, kernel-core 5.14.0-362.13.1.el9_3, kernel-tools 5.14.0-362.13.1.el9_3, python3-perf 5.14.0-362.13.1.el9_3, +29 more Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-362.13.1.el9_3, kernel-rt-core 5.14.0-362.13.1.el9_3, kernel-rt-modules 5.14.0-362.13.1.el9_3, kernel-rt-debug-core 5.14.0-362.13.1.el9_3, kernel-rt-modules-core 5.14.0-362.13.1.el9_3, kernel-rt-debug-modules 5.14.0-362.13.1.el9_3, +4 more Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-362.13.1.el9_3, kernel-rt-kvm 5.14.0-362.13.1.el9_3, kernel-rt-core 5.14.0-362.13.1.el9_3, kernel-rt-modules 5.14.0-362.13.1.el9_3, kernel-rt-debug-kvm 5.14.0-362.13.1.el9_3, kernel-rt-debug-core 5.14.0-362.13.1.el9_3, +6 more
    fixed: vendor fix RHSA-2023:7749
  • 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 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
20 mo ago

Exploit prediction

0.48% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Kernel

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.