CVE-2021-47355

atm: nicstar: Fix possible use-after-free in nicstar_cleanup()

Severity Score

"-"

*CVSS v-

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

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

atm: nicstar: Fix possible use-after-free in nicstar_cleanup()

This module's remove path calls del_timer(). However, that function
does not wait until the timer handler finishes. This means that the
timer handler may still be running after the driver's remove function
has finished, which would result in a use-after-free.

Fix by calling del_timer_sync(), which makes sure the timer handler
has finished, and unable to re-schedule itself.

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: atm: nicstar: corrige el posible use after free en nicstar_cleanup(). La ruta de eliminación de este módulo llama a del_timer(). Sin embargo, esa función no espera hasta que finalice el controlador del temporizador. Esto significa que es posible que el controlador del temporizador aún esté ejecutándose después de que haya finalizado la función de eliminación del controlador, lo que daría como resultado un use after free. Para solucionarlo, llame a del_timer_sync(), lo que garantiza que el controlador del temporizador haya finalizado y no pueda reprogramarse.

*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

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-05-21 CVE Reserved
2024-05-21 CVE Published
2024-05-22 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (9)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/99779c9d9ffc7775da6f7fd8a7c93ac61657bed5	2021-07-20
https://git.kernel.org/stable/c/4e2a0848ea2cab0716d46f85a8ccd5fa9a493e51	2021-07-20
https://git.kernel.org/stable/c/c471569632654e57c83512e0fc1ba0dbb4544ad6	2021-07-20
https://git.kernel.org/stable/c/a7a7b2848312cc4c3a42b6e42a8ab2e441857aba	2021-07-20
https://git.kernel.org/stable/c/bdf5334250c69fabf555b7322c75249ea7d5f148	2021-07-19
https://git.kernel.org/stable/c/a7f7c42e31157d1f0871d6a8e1a0b73a6b4ea785	2021-07-19
https://git.kernel.org/stable/c/2f958b6f6ba0854b39be748d21dfe71e0fe6580f	2021-07-19
https://git.kernel.org/stable/c/5b991df8881088448cb223e769e37cab8dd40706	2021-07-19
https://git.kernel.org/stable/c/34e7434ba4e97f4b85c1423a59b2922ba7dff2ea	2021-05-12

URL	Date	SRC

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"				< 4.4.276 Search vendor "Linux" for product "Linux Kernel" and version " < 4.4.276"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 4.9.276 Search vendor "Linux" for product "Linux Kernel" and version " < 4.9.276"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 4.14.240 Search vendor "Linux" for product "Linux Kernel" and version " < 4.14.240"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 4.19.198 Search vendor "Linux" for product "Linux Kernel" and version " < 4.19.198"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.4.133 Search vendor "Linux" for product "Linux Kernel" and version " < 5.4.133"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.10.51 Search vendor "Linux" for product "Linux Kernel" and version " < 5.10.51"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.12.18 Search vendor "Linux" for product "Linux Kernel" and version " < 5.12.18"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.13.3 Search vendor "Linux" for product "Linux Kernel" and version " < 5.13.3"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.14 Search vendor "Linux" for product "Linux Kernel" and version " < 5.14"		en		Affected