// For flags

CVE-2022-4696

 

Severity Score

7.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track*
*SSVC
Descriptions

There exists a use-after-free vulnerability in the Linux kernel through io_uring and the IORING_OP_SPLICE operation. If IORING_OP_SPLICE is missing the IO_WQ_WORK_FILES flag, which signals that the operation won't use current->nsproxy, so its reference counter is not increased. This assumption is not always true as calling io_splice on specific files will call the get_uts function which will use current->nsproxy leading to invalidly decreasing its reference counter later causing the use-after-free vulnerability. We recommend upgrading to version 5.10.160 or above

Existe una vulnerabilidad de use-after-free en el kernel de Linux a través de io_uring y la operación IORING_OP_SPLICE. Si a IORING_OP_SPLICE le falta el indicador IO_WQ_WORK_FILES, que indica que la operación no utilizará current->nsproxy, por lo que su contador de referencia no aumenta. Esta suposición no siempre es cierta, ya que llamar a io_splice en archivos específicos llamará a la función get_uts, que utilizará current->nsproxy, lo que provocará una disminución no válida de su contador de referencia y luego provocará la vulnerabilidad de use-after-free. Recomendamos actualizar a la versión 5.10.160 o superior

*Credits: Bing-Jhong Billy Jheng of Starlabs
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
* Common Vulnerability Scoring System
SSVC
  • Decision:Track*
Exploitation
None
Automatable
No
Tech. Impact
Total
* Organization's Worst-case Scenario
Timeline
  • 2022-12-23 CVE Reserved
  • 2023-01-11 CVE Published
  • 2024-08-03 CVE Updated
  • 2024-08-03 EPSS Updated
  • 2024-08-03 First Exploit
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-416: Use After Free
  • CWE-763: Release of Invalid Pointer or Reference
CAPEC
  • CAPEC-251: Local Code Inclusion
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"
 >= 5.10 < 5.12
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.10 < 5.12"
-
Affected