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CVE-2023-6606

Kernel: out-of-bounds read vulnerability in smbcalcsize

HIGH
7.1
CVSS Score
Published: December 8, 2023 at 04:58 PM UTC
Updated: October 14, 2026 at 11:17 PM UTC
5 products affected across 2 vendorsLinux KernelEnterprise LinuxEnterprise Linux Server Aus

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Severity
HIGH7.1
Exploit prediction
EPSS 0.5%
SSVC
PoC

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
6.4.1 ≤ v < 6.76.46.4 rc46.4 rc56.4 rc66.4 rc76.76.7 rc16.7 rc26.7 rc36.7 rc46.7 rc56.7 rc6
Affected range stops below 6.7, so it looks safe — our inference, not a vendor statement
Enterprise Linux· Red Hatrpm
95%
8.09.0
Vendor states this is fixed in 0:4.18.0-372.95.1.el8_6 (unaffected)
Vendor states this is fixed in 0:4.18.0-477.51.1.el8_8 (unaffected)
Vendor states this is fixed in 0:4.18.0-513.18.1.el8_9 (unaffected)
Vendor states this is fixed in 0:4.18.0-513.18.1.rt7.320.el8_9 (unaffected)
Vendor states this is fixed in 0:5.14.0-284.52.1.el9_2 (unaffected)
Vendor states this is fixed in 0:5.14.0-284.52.1.rt14.337.el9_2 (unaffected)
Vendor states this is fixed in 0:5.14.0-362.24.1.el9_3 (unaffected)
Vendor states this is fixed in 6 (unknown)
Vendor states this is fixed in 7 (unknown)
Enterprise Linux Eus· Red Hatrpm
95%
9.29.4
Enterprise Linux Server Aus· Red Hatrubygems
95%
9.29.4
Enterprise Linux Server for Power Little Endian Update Services for SAP Solutions· Red Hat
95%
9.29.2_ppc64le

References (15)

Vendor Advisoryx_refsource_REDHATThird Party Advisory
Source: [email protected]
https://access.redhat.com/errata/RHSA-2024:0723
Vendor Advisoryx_refsource_REDHATThird Party Advisory
Source: [email protected]
https://access.redhat.com/errata/RHSA-2024:0725
Vendor Advisoryx_refsource_REDHATThird Party Advisory
Source: [email protected]
https://access.redhat.com/errata/RHSA-2024:0881
Vendor Advisoryx_refsource_REDHATThird Party Advisory
Source: [email protected]
https://access.redhat.com/errata/RHSA-2024:0897
Vendor Advisoryx_refsource_REDHATThird Party Advisory
Source: [email protected]
https://access.redhat.com/errata/RHSA-2024:1188
Vendor Advisoryx_refsource_REDHATThird Party Advisory
Source: [email protected]
https://access.redhat.com/errata/RHSA-2024:1248
Vendor Advisoryx_refsource_REDHATThird Party Advisory
Source: [email protected]
https://access.redhat.com/errata/RHSA-2024:1404
Vendor Advisoryx_refsource_REDHATThird Party Advisory
Source: [email protected]
https://access.redhat.com/errata/RHSA-2024:2094

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.1HIGHredhat
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-125

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