Skip to content
Fencer Vulns
high 7.1

CVE-2023-6606 json

Kernel: out-of-bounds read vulnerability in smbcalcsize

published 2023-12-08 2 y ago modified 2026-11-05 4 d ago also EUVD-2023-58829

cvss
7.1
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 44%
public exploits
0
none known

Summary

An out-of-bounds read vulnerability was found in smbCalcSize in fs/smb/client/netmisc.c in the Linux Kernel. This issue could allow a local attacker to crash the system or leak internal kernel information.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 8 0:4.18.0-513.18.1.el8_9, 0:4.18.0-513.18.1.rt7.320.el8_9
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support 0:4.18.0-372.95.1.el8_6
  • Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support 0:4.18.0-477.51.1.el8_8
  • Red Hat Red Hat Enterprise Linux 9 0:5.14.0-362.24.1.el9_3
  • Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support 0:5.14.0-284.52.1.el9_2, 0:5.14.0-284.52.1.rt14.337.el9_2
  • Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 0:4.18.0-372.95.1.el8_6
  • Red Hat RHOL-5.8-RHEL-9 v0.1.0-224, v0.1.0-525, v0.4.0-247, v0.28.1-56, v1.0.0-479, v1.1.0-227, v2.9.6-14, v5.8.1-470, v5.8.6-2, v5.8.6-5, v5.8.6-7, v5.8.6-10, v5.8.6-11, v5.8.6-19, v5.8.6-22, v5.8.6-24, v6.8.1-407
  • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem V1.1
  • linux Debian 12 6.1.76-1
  • linux Debian 14, Debian 13 6.6.9-1

debian advisories DEBIAN-CVE-2023-6606

  • linux Ubuntu 20.04 LTS 5.4.0-170.188
  • linux Ubuntu 22.04 LTS 5.15.0-92.102
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1117.127
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1052.57
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1121.130
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1049.57
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1049.54
  • linux-ibm Ubuntu 20.04 LTS 5.4.0-1064.69

ubuntu advisories UBUNTU-CVE-2023-6606

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

  • perf rhev hypervisor 4.4, RHEL 8.6 EUS 4.18.0-372.95.1.el8_6
  • kernel RHEL 9 5.14.0-362.24.1.el9_3
  • rv RHEL 9 5.14.0-362.24.1.el9_3
  • perf RHEL 9 5.14.0-362.24.1.el9_3
  • rtla RHEL 9 5.14.0-362.24.1.el9_3
  • bpftool RHEL 9 7.2.0-362.24.1.el9_3
  • libperf RHEL 9 5.14.0-362.24.1.el9_3
  • kernel-rt RHEL 9 5.14.0-362.24.1.el9_3

red hat advisories RHSA-2024:1404RHSA-2024:1188RHSA-2024:0723RHSA-2024:0725RHSA-2024:1248RHSA-2024:0881

  • dtb-aarch64 openSUSE Leap 15.5 5.14.21-150500.55.44.1
  • kernel-64kb SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.44.1
  • kernel-syms SLE Module for Development Tools 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.44.1
  • kernel-obs-qa openSUSE Leap 15.5 5.14.21-150500.55.44.1
  • kernel-source SLE Module for Development Tools 15 SP5, SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.44.1
  • kernel-default SLE Workstation Extension 15 SP5, SLE Module for Legacy 15 SP5, SLE Module for Basesystem 15 SP5 +4 more 5.14.21-150500.55.44.1
  • kernel-kvmsmall openSUSE Leap 15.5 5.14.21-150500.55.44.1
  • kernel-zfcpdump SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.44.1

suse advisories SUSE-SU-2025:0834-1SUSE-SU-2024:0160-1SUSE-SU-2024:0156-1SUSE-SU-2024:0154-1SUSE-SU-2024:0153-1SUSE-SU-2024:0141-1

  • kernel-source openSUSE Tumbleweed 6.6.9-1.1
  • kernel-source openSUSE Tumbleweed 6.6.17-1.1

opensuse advisories openSUSE-SU-2024:13547-1openSUSE-SU-2024:13704-1

  • kernel AlmaLinux 8 4.18.0-513.18.1.el8_9
  • perf AlmaLinux 8 4.18.0-513.18.1.el8_9
  • bpftool AlmaLinux 8 4.18.0-513.18.1.el8_9
  • kernel-core AlmaLinux 8 4.18.0-513.18.1.el8_9
  • kernel-tools AlmaLinux 8 4.18.0-513.18.1.el8_9
  • python3-perf AlmaLinux 8 4.18.0-513.18.1.el8_9
  • kernel-modules AlmaLinux 8 4.18.0-513.18.1.el8_9
  • kernel-zfcpdump AlmaLinux 8 4.18.0-513.18.1.el8_9

almalinux advisories ALSA-2024:0897

  • kernel Rocky Linux 9 5.14.0-362.24.1.el9_3.cloud.0.6

rocky linux advisories RXSA-2024:1248

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-2023-6606 updated cvss 7.1

kernel: Out-Of-Bounds Read vulnerability in smbCalcSize

  • 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
    affected: workaround, no fix planned “To mitigate this issue, prevent module cifs from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.”
  • 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
    affected: workaround, no fix available “To mitigate this issue, prevent module cifs from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.”
  • Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-513.18.1.el8_9, kernel-debuginfo-common-aarch64 4.18.0-513.18.1.el8_9, kernel-debuginfo-common-ppc64le 4.18.0-513.18.1.el8_9
    fixed: vendor fix “To mitigate this issue, prevent module cifs from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2024:0897
  • Red Hat CodeReady Linux Builder (v. 9) libperf 5.14.0-362.24.1.el9_3, kernel-debuginfo-common-s390x 5.14.0-362.24.1.el9_3, kernel-debuginfo-common-x86_64 5.14.0-362.24.1.el9_3, kernel-debuginfo-common-aarch64 5.14.0-362.24.1.el9_3, kernel-debuginfo-common-ppc64le 5.14.0-362.24.1.el9_3
    fixed: vendor fix “To mitigate this issue, prevent module cifs from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2024:1248
  • Red Hat CodeReady Linux Builder EUS (v.8.6) kernel-debuginfo-common-x86_64 4.18.0-372.95.1.el8_6, kernel-debuginfo-common-aarch64 4.18.0-372.95.1.el8_6, kernel-debuginfo-common-ppc64le 4.18.0-372.95.1.el8_6
    fixed: vendor fix “To mitigate this issue, prevent module cifs from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2024:1188
  • Red Hat CodeReady Linux Builder EUS (v.8.8) kernel-debuginfo-common-x86_64 4.18.0-477.51.1.el8_8, kernel-debuginfo-common-aarch64 4.18.0-477.51.1.el8_8, kernel-debuginfo-common-ppc64le 4.18.0-477.51.1.el8_8
    fixed: vendor fix “To mitigate this issue, prevent module cifs from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2024:1404
  • Red Hat CodeReady Linux Builder EUS (v.9.2) kernel-debuginfo-common-s390x 5.14.0-284.52.1.el9_2, kernel-debuginfo-common-x86_64 5.14.0-284.52.1.el9_2, kernel-debuginfo-common-aarch64 5.14.0-284.52.1.el9_2, kernel-debuginfo-common-ppc64le 5.14.0-284.52.1.el9_2
    fixed: vendor fix “To mitigate this issue, prevent module cifs from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2024:0723
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-362.24.1.el9_3, perf 5.14.0-362.24.1.el9_3, rtla 5.14.0-362.24.1.el9_3, kernel-devel-matched 5.14.0-362.24.1.el9_3, kernel-64k-devel-matched 5.14.0-362.24.1.el9_3, kernel-debug-devel-matched 5.14.0-362.24.1.el9_3, +6 more
    fixed: vendor fix “To mitigate this issue, prevent module cifs from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2024:1248
show 14 more
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) perf 5.14.0-284.52.1.el9_2, rtla 5.14.0-284.52.1.el9_2, kernel-devel-matched 5.14.0-284.52.1.el9_2, kernel-64k-devel-matched 5.14.0-284.52.1.el9_2, kernel-debug-devel-matched 5.14.0-284.52.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.52.1.el9_2, +5 more
    fixed: vendor fix “To mitigate this issue, prevent module cifs from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2024:0723
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-513.18.1.el8_9, kernel 4.18.0-513.18.1.el8_9, bpftool 4.18.0-513.18.1.el8_9, kernel-core 4.18.0-513.18.1.el8_9, kernel-tools 4.18.0-513.18.1.el8_9, python3-perf 4.18.0-513.18.1.el8_9, +15 more
    fixed: vendor fix “To mitigate this issue, prevent module cifs from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2024:0897
  • Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.2.0-362.24.1.el9_3, kernel 5.14.0-362.24.1.el9_3, kernel-64k 5.14.0-362.24.1.el9_3, kernel-core 5.14.0-362.24.1.el9_3, kernel-tools 5.14.0-362.24.1.el9_3, python3-perf 5.14.0-362.24.1.el9_3, +28 more
    fixed: vendor fix “To mitigate this issue, prevent module cifs from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2024:1248
  • Red Hat Enterprise Linux BaseOS EUS (v.8.6) perf 4.18.0-372.95.1.el8_6, kernel 4.18.0-372.95.1.el8_6, bpftool 4.18.0-372.95.1.el8_6, kernel-core 4.18.0-372.95.1.el8_6, kernel-tools 4.18.0-372.95.1.el8_6, python3-perf 4.18.0-372.95.1.el8_6, +15 more
    fixed: vendor fix “To mitigate this issue, prevent module cifs from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2024:1188
  • Red Hat Enterprise Linux BaseOS EUS (v.8.8) perf 4.18.0-477.51.1.el8_8, kernel 4.18.0-477.51.1.el8_8, bpftool 4.18.0-477.51.1.el8_8, kernel-core 4.18.0-477.51.1.el8_8, kernel-tools 4.18.0-477.51.1.el8_8, python3-perf 4.18.0-477.51.1.el8_8, +15 more
    fixed: vendor fix “To mitigate this issue, prevent module cifs from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2024:1404
  • Red Hat Enterprise Linux BaseOS EUS (v.9.2) bpftool 7.0.0-284.52.1.el9_2, kernel 5.14.0-284.52.1.el9_2, kernel-64k 5.14.0-284.52.1.el9_2, kernel-core 5.14.0-284.52.1.el9_2, kernel-tools 5.14.0-284.52.1.el9_2, python3-perf 5.14.0-284.52.1.el9_2, +28 more
    fixed: vendor fix “To mitigate this issue, prevent module cifs from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2024:0723
  • Red Hat Enterprise Linux for Real Time (v. 8) kernel-rt 4.18.0-513.18.1.rt7.320.el8_9, kernel-rt-core 4.18.0-513.18.1.rt7.320.el8_9, kernel-rt-modules 4.18.0-513.18.1.rt7.320.el8_9, kernel-rt-debug-core 4.18.0-513.18.1.rt7.320.el8_9, kernel-rt-debug-modules 4.18.0-513.18.1.rt7.320.el8_9, kernel-rt-modules-extra 4.18.0-513.18.1.rt7.320.el8_9, +2 more
    fixed: vendor fix “To mitigate this issue, prevent module cifs from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2024:0881
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-362.24.1.el9_3, kernel-rt-core 5.14.0-362.24.1.el9_3, kernel-rt-modules 5.14.0-362.24.1.el9_3, kernel-rt-debug-core 5.14.0-362.24.1.el9_3, kernel-rt-modules-core 5.14.0-362.24.1.el9_3, kernel-rt-debug-modules 5.14.0-362.24.1.el9_3, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module cifs from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2024:1248
  • Red Hat Enterprise Linux Real Time EUS (v.9.2) kernel-rt 5.14.0-284.52.1.rt14.337.el9_2, kernel-rt-core 5.14.0-284.52.1.rt14.337.el9_2, kernel-rt-modules 5.14.0-284.52.1.rt14.337.el9_2, kernel-rt-debug-core 5.14.0-284.52.1.rt14.337.el9_2, kernel-rt-modules-core 5.14.0-284.52.1.rt14.337.el9_2, kernel-rt-debug-modules 5.14.0-284.52.1.rt14.337.el9_2, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module cifs from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2024:0725
  • Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt 4.18.0-513.18.1.rt7.320.el8_9, kernel-rt-kvm 4.18.0-513.18.1.rt7.320.el8_9, kernel-rt-core 4.18.0-513.18.1.rt7.320.el8_9, kernel-rt-modules 4.18.0-513.18.1.rt7.320.el8_9, kernel-rt-debug-kvm 4.18.0-513.18.1.rt7.320.el8_9, kernel-rt-debug-core 4.18.0-513.18.1.rt7.320.el8_9, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module cifs from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2024:0881
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-362.24.1.el9_3, kernel-rt-kvm 5.14.0-362.24.1.el9_3, kernel-rt-core 5.14.0-362.24.1.el9_3, kernel-rt-modules 5.14.0-362.24.1.el9_3, kernel-rt-debug-kvm 5.14.0-362.24.1.el9_3, kernel-rt-debug-core 5.14.0-362.24.1.el9_3, +6 more
    fixed: vendor fix “To mitigate this issue, prevent module cifs from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2024:1248
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2) kernel-rt 5.14.0-284.52.1.rt14.337.el9_2, kernel-rt-kvm 5.14.0-284.52.1.rt14.337.el9_2, kernel-rt-core 5.14.0-284.52.1.rt14.337.el9_2, kernel-rt-modules 5.14.0-284.52.1.rt14.337.el9_2, kernel-rt-debug-kvm 5.14.0-284.52.1.rt14.337.el9_2, kernel-rt-debug-core 5.14.0-284.52.1.rt14.337.el9_2, +6 more
    fixed: vendor fix “To mitigate this issue, prevent module cifs from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2024:0725
  • Red Hat Virtualization 4 Hypervisor for RHEL 8 perf 4.18.0-372.95.1.el8_6, kernel-debuginfo-common-x86_64 4.18.0-372.95.1.el8_6
    fixed: vendor fix “To mitigate this issue, prevent module cifs from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2024:1188
  • Red Hat RHOL 5.8 for RHEL 9 openshift-logging/fluentd-rhel9 v5.8.6-5, openshift-logging/vector-rhel9 v0.28.1-56, openshift-logging/eventrouter-rhel9 v0.4.0-247, openshift-logging/logging-loki-rhel9 v2.9.6-14, openshift-logging/loki-rhel9-operator v5.8.6-10, openshift-logging/loki-operator-bundle v5.8.6-24, +11 more
    fixed: vendor fix “To mitigate this issue, prevent module cifs from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2024:2094

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 ICSA-25-226-15 updated

Siemens SINEC OS

  • Siemens RUGGEDCOM RST2428P (6GK6242-6PA00) Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family
    not affected

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-23-166-11 updated cvss 7.1

Siemens SIMATIC S7-1500 TM MFP Linux Kernel

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.53% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.kernel.org https://bugzilla.kernel.org/show_bug.cgi?id=218218 referenced PoC, tagged "exploit" by a source, unverified
  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2253611 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/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

  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support
  • Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8
  • Red Hat RHOL-5.8-RHEL-9
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Siemens RUGGEDCOM RST2428P
  • Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family
  • Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family
  • Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem

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.