// For flags

CVE-2019-19241

Linux 5.3 - Privilege Escalation via io_uring Offload of sendmsg() onto Kernel Thread with Kernel Creds

Severity Score

7.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

In the Linux kernel before 5.4.2, the io_uring feature leads to requests that inadvertently have UID 0 and full capabilities, aka CID-181e448d8709. This is related to fs/io-wq.c, fs/io_uring.c, and net/socket.c. For example, an attacker can bypass intended restrictions on adding an IPv4 address to the loopback interface. This occurs because IORING_OP_SENDMSG operations, although requested in the context of an unprivileged user, are sometimes performed by a kernel worker thread without considering that context.

En el kernel de Linux versiones anteriores a la versión 5.4.2, la característica io_uring genera peticiones que inadvertidamente tienen UID 0 y capacidades completas, también se conoce como CID-181e448d8709. Esto está relacionado con los archivos fs/io-wq.c, fs/io_uring.c, y net/socket.c. Por ejemplo, un atacante puede eludir las restricciones previstas para agregar una dirección IPv4 a la interfaz de bucle invertido. Esto ocurre porque las operaciones IORING_OP_SENDMSG, aunque se solicitan en el contexto de un usuario sin privilegios, a veces las realiza un subproceso de trabajo del kernel sin tener en cuenta ese contexto.

Linux suffers from a privilege escalation vulnerability via io_uring offload of sendmsg() onto kernel thread with kernel creds.

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Local
Attack Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2019-11-25 CVE Reserved
  • 2019-12-16 CVE Published
  • 2019-12-16 First Exploit
  • 2023-09-18 EPSS Updated
  • 2024-08-05 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
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"
 < 5.4.2
Search vendor "Linux" for product "Linux Kernel" and version " < 5.4.2"
-
Affected