// For flags

CVE-2021-47294

netrom: Decrease sock refcount when sock timers expire

Severity Score

"-"
*CVSS v-

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:

netrom: Decrease sock refcount when sock timers expire

Commit 63346650c1a9 ("netrom: switch to sock timer API") switched to use
sock timer API. It replaces mod_timer() by sk_reset_timer(), and
del_timer() by sk_stop_timer().

Function sk_reset_timer() will increase the refcount of sock if it is
called on an inactive timer, hence, in case the timer expires, we need to
decrease the refcount ourselves in the handler, otherwise, the sock
refcount will be unbalanced and the sock will never be freed.

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: netrom: Disminuir el recuento de sock cuando caducan los temporizadores de sock. La confirmación 63346650c1a9 ("netrom: cambiar a API de temporizador de sock") cambió para usar la API de temporizador de sock. Reemplaza mod_timer() por sk_reset_timer() y del_timer() por sk_stop_timer(). La función sk_reset_timer() aumentará el recuento del sock si se llama en un temporizador inactivo, por lo tanto, en caso de que el temporizador expire, debemos disminuir el recuento nosotros mismos en el controlador; de lo contrario, el recuento del calcetín se desequilibrará y el sock nunca será liberado.

*Credits: N/A
CVSS Scores
Attack Vector
-
Attack Complexity
-
Privileges Required
-
User Interaction
-
Scope
-
Confidentiality
-
Integrity
-
Availability
-
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-05-21 CVE Reserved
  • 2024-05-21 CVE Published
  • 2024-05-22 EPSS Updated
  • 2024-12-19 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
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"
>= 4.4.173 < 4.4.277
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.4.173 < 4.4.277"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 4.9.155 < 4.9.277
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.9.155 < 4.9.277"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 4.14.98 < 4.14.241
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.14.98 < 4.14.241"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 4.19.20 < 4.19.199
Search vendor "Linux" for product "Linux Kernel" and version " >= 4.19.20 < 4.19.199"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 5.0 < 5.4.136
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.0 < 5.4.136"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 5.0 < 5.10.54
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.0 < 5.10.54"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 5.0 < 5.13.6
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.0 < 5.13.6"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
>= 5.0 < 5.14
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.0 < 5.14"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
3.18.134
Search vendor "Linux" for product "Linux Kernel" and version "3.18.134"
en
Affected
Linux
Search vendor "Linux"
Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
4.20.7
Search vendor "Linux" for product "Linux Kernel" and version "4.20.7"
en
Affected