// For flags

CVE-2023-38431

Ubuntu Security Notice USN-6466-1

Severity Score

9.1
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

An issue was discovered in the Linux kernel before 6.3.8. fs/smb/server/connection.c in ksmbd does not validate the relationship between the NetBIOS header's length field and the SMB header sizes, via pdu_size in ksmbd_conn_handler_loop, leading to an out-of-bounds read.

Chih-Yen Chang discovered that the KSMBD implementation in the Linux kernel did not properly validate certain data structure fields when parsing lease contexts, leading to an out-of-bounds read vulnerability. A remote attacker could use this to cause a denial of service or possibly expose sensitive information. Quentin Minster discovered that a race condition existed in the KSMBD implementation in the Linux kernel, leading to a use-after-free vulnerability. A remote attacker could use this to cause a denial of service or possibly execute arbitrary code.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
Complete
Integrity
None
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2023-07-17 CVE Reserved
  • 2023-07-17 CVE Published
  • 2024-08-02 CVE Updated
  • 2025-03-30 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-125: Out-of-bounds Read
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 5.15 < 6.1.34
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.15 < 6.1.34"
-
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 6.2 < 6.3.8
Search vendor "Linux" for product "Linux Kernel" and version " >= 6.2 < 6.3.8"
-
Affected
Netapp
Search vendor "Netapp"
Solidfire \& Hci Management Node
Search vendor "Netapp" for product "Solidfire \& Hci Management Node"
--
Affected
Netapp
Search vendor "Netapp"
H300s
Search vendor "Netapp" for product "H300s"
--
Affected
Netapp
Search vendor "Netapp"
H410s
Search vendor "Netapp" for product "H410s"
--
Affected
Netapp
Search vendor "Netapp"
H500s
Search vendor "Netapp" for product "H500s"
--
Affected
Netapp
Search vendor "Netapp"
H700s
Search vendor "Netapp" for product "H700s"
--
Affected