Linux Kernel SMB client OOB read in smbCalcSize
CVE-2023-6606 Published on December 8, 2023

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.

Vendor Advisory Vendor Advisory Vendor Advisory Vendor Advisory Vendor Advisory Vendor Advisory Vendor Advisory Vendor Advisory NVD

Vulnerability Analysis

CVE-2023-6606 is exploitable with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. Public availability of a proof of concept (POC) exploit exists for CVE-2023-6606. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity, and a high impact on availability.

Attack Vector:
LOCAL
Attack Complexity:
LOW
Privileges Required:
LOW
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
NONE
Availability Impact:
HIGH

Weakness Type

Out-of-bounds Read

The software reads data past the end, or before the beginning, of the intended buffer. Typically, this can allow attackers to read sensitive information from other memory locations or cause a crash. A crash can occur when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string. The expected sentinel might not be located in the out-of-bounds memory, causing excessive data to be read, leading to a segmentation fault or a buffer overflow. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent read operation then produces undefined or unexpected results.


Products Associated with CVE-2023-6606

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2023-6606 are published in these products:

Linux Kernel
 
Red Hat Enterprise Linux (RHEL)
 
Canonical Ubuntu Linux
 
Red Hat Enterprise Linux Server Aus
 
Red Hat Enterprise Linux Eus
 
Red Hat Enterprise Linux Server Power Little Endian Update Services Sap Solutions
 
Red Hat Rhel Eus
 
Red Hat Rhev Hypervisor
 
Red Hat Logging
 

Affected Versions

Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8.6 Extended Update Support: Red Hat Enterprise Linux 8.8 Extended Update Support: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9.2 Extended Update Support: Red Hat Enterprise Linux 9.2 Extended Update Support: Red Hat Virtualization 4 for Red Hat Enterprise Linux 8: Red Hat RHOL-5.8-RHEL-9: Red Hat RHOL-5.8-RHEL-9: Red Hat RHOL-5.8-RHEL-9: Red Hat RHOL-5.8-RHEL-9: Red Hat RHOL-5.8-RHEL-9: Red Hat RHOL-5.8-RHEL-9: Red Hat RHOL-5.8-RHEL-9: Red Hat RHOL-5.8-RHEL-9: Red Hat RHOL-5.8-RHEL-9: Red Hat RHOL-5.8-RHEL-9: Red Hat RHOL-5.8-RHEL-9: Red Hat RHOL-5.8-RHEL-9: Red Hat RHOL-5.8-RHEL-9: Red Hat RHOL-5.8-RHEL-9: Red Hat RHOL-5.8-RHEL-9: Red Hat RHOL-5.8-RHEL-9: Red Hat RHOL-5.8-RHEL-9: Red Hat Enterprise Linux 6: Red Hat Enterprise Linux 7: Red Hat Enterprise Linux 7: Red Hat Enterprise Linux 9:

Exploit Probability

EPSS
0.01%
Percentile
0.56%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.