// For flags

CVE-2021-46937

mm/damon/dbgfs: fix 'struct pid' leaks in 'dbgfs_target_ids_write()'

Severity Score

5.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

In the Linux kernel, the following vulnerability has been resolved:

mm/damon/dbgfs: fix 'struct pid' leaks in 'dbgfs_target_ids_write()'

DAMON debugfs interface increases the reference counts of 'struct pid's
for targets from the 'target_ids' file write callback
('dbgfs_target_ids_write()'), but decreases the counts only in DAMON
monitoring termination callback ('dbgfs_before_terminate()').

Therefore, when 'target_ids' file is repeatedly written without DAMON
monitoring start/termination, the reference count is not decreased and
therefore memory for the 'struct pid' cannot be freed. This commit
fixes this issue by decreasing the reference counts when 'target_ids' is
written.

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm/damon/dbgfs: corrige las fugas de 'struct pid' en 'dbgfs_target_ids_write()' La interfaz DAMON debugfs aumenta los recuentos de referencias de 'struct pid' para los objetivos de la escritura del archivo 'target_ids' devolución de llamada ('dbgfs_target_ids_write()'), pero disminuye los recuentos solo en la devolución de llamada de terminación de monitoreo de DAMON ('dbgfs_before_terminate()'). Por lo tanto, cuando el archivo 'target_ids' se escribe repetidamente sin que DAMON supervise el inicio/terminación, el recuento de referencias no disminuye y, por lo tanto, no se puede liberar memoria para 'struct pid'. Este commit soluciona este problema al disminuir el recuento de referencias cuando se escribe 'target_ids'.

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-02-25 CVE Reserved
  • 2024-02-27 CVE Published
  • 2024-02-28 EPSS Updated
  • 2024-08-04 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-668: Exposure of Resource to Wrong Sphere
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 < 5.15.13
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.15 < 5.15.13"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 5.15 < 5.16
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.15 < 5.16"
en
Affected