// For flags

CVE-2023-39191

Kernel: ebpf: insufficient stack type checks in dynptr

Severity Score

8.2
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track*
*SSVC
Descriptions

An improper input validation flaw was found in the eBPF subsystem in the Linux kernel. The issue occurs due to a lack of proper validation of dynamic pointers within user-supplied eBPF programs prior to executing them. This may allow an attacker with CAP_BPF privileges to escalate privileges and execute arbitrary code in the context of the kernel.

Se encontró una falla de validación de entrada incorrecta en el subsistema eBPF del kernel de Linux. El problema se debe a una falta de validación adecuada de los punteros dinámicos dentro de los programas eBPF proporcionados por el usuario antes de ejecutarlos. Esto puede permitir que un atacante con privilegios CAP_BPF escale privilegios y ejecute código arbitrario en el contexto del kernel.

This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel. An attacker must first obtain the ability to execute high-privileged code on the target system in order to exploit this vulnerability.
The specific flaw exists within the handling of eBPF programs. The issue results from the lack of proper validation of user-supplied eBPF programs prior to executing them. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the kernel.

*Credits: Red Hat would like to thank Zero Day Initiative (ZDI) for reporting this issue.
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Local
Attack Complexity
Low
Authentication
Multiple
Confidentiality
Complete
Integrity
Complete
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:Track*
Exploitation
None
Automatable
No
Tech. Impact
Total
* Organization's Worst-case Scenario
Timeline
  • 2023-07-25 CVE Reserved
  • 2023-09-29 CVE Published
  • 2025-02-27 CVE Updated
  • 2025-03-18 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-20: Improper Input Validation
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Linux
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Linux Kernel
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< 6.3
Search vendor "Linux" for product "Linux Kernel" and version " < 6.3"
-
Affected
Fedoraproject
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Fedora
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38
Search vendor "Fedoraproject" for product "Fedora" and version "38"
-
Affected
Redhat
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Enterprise Linux
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9.0
Search vendor "Redhat" for product "Enterprise Linux" and version "9.0"
-
Affected