CVE-2021-47289

ACPI: fix NULL pointer dereference

Severity Score

5.5

*CVSS v3.1

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:

ACPI: fix NULL pointer dereference

Commit 71f642833284 ("ACPI: utils: Fix reference counting in
for_each_acpi_dev_match()") started doing "acpi_dev_put()" on a pointer
that was possibly NULL. That fails miserably, because that helper
inline function is not set up to handle that case.

Just make acpi_dev_put() silently accept a NULL pointer, rather than
calling down to put_device() with an invalid offset off that NULL
pointer.

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: ACPI: corrige la desreferencia del puntero NULL. La confirmación 71f642833284 ("ACPI: utils: corrige el recuento de referencias en for_each_acpi_dev_match()") comenzó a hacer "acpi_dev_put()" en un puntero que posiblemente era NULL. Eso falla estrepitosamente, porque esa función auxiliar en línea no está configurada para manejar ese caso. Simplemente haga que acpi_dev_put() acepte silenciosamente un puntero NULL, en lugar de llamar a put_device() con un desplazamiento no válido de ese puntero NULL.

*Credits: N/A

CVSS Scores

Red Hatv3.1 5.5

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

* 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
2024-09-11 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-476: NULL Pointer Dereference

CAPEC

References (6)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/38f54217b423c0101d03a00feec6fb8ec608b12e	2021-08-08
https://git.kernel.org/stable/c/cae3fa3d8165761f3000f523b11cfa1cd35206bc	2021-08-08
https://git.kernel.org/stable/c/ccf23a0888077a25a0793a746c3941db2a7562e4	2021-07-28
https://git.kernel.org/stable/c/fc68f42aa737dc15e7665a4101d4168aadb8e4c4	2021-07-24

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2021-47289	2024-09-24
https://bugzilla.redhat.com/show_bug.cgi?id=2282508	2024-09-24

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"				< 5.4.139 Search vendor "Linux" for product "Linux Kernel" and version " < 5.4.139"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.10.57 Search vendor "Linux" for product "Linux Kernel" and version " < 5.10.57"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.13.6 Search vendor "Linux" for product "Linux Kernel" and version " < 5.13.6"		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