CVE-2021-47427

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  2. Vulnerabilities (CVE)
  3. CVE-2021-47427

7.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

I

n the Linux kernel, the following vulnerability has been resolved: scsi: iscsi: Fix iscsi_task use after free Commit d39df158518c ("scsi: iscsi: Have abort handler get ref to conn") added iscsi_get_conn()/iscsi_put_conn() calls during abort handling but then also changed the handling of the case where we detect an already completed task where we now end up doing a goto to the common put/cleanup code. This results in a iscsi_task use after free, because the common cleanup code will do a put on the iscsi_task. This reverts the goto and moves the iscsi_get_conn() to after we've checked if the iscsi_task is valid.

References
Link Resource
https://git.kernel.org/stable/c/1642f51ac0d4f2b55d5748094c49ff8f7191b93c Patch
https://git.kernel.org/stable/c/258aad75c62146453d03028a44f2f1590d58e1f6 Patch
https://git.kernel.org/stable/c/1642f51ac0d4f2b55d5748094c49ff8f7191b93c Patch
https://git.kernel.org/stable/c/258aad75c62146453d03028a44f2f1590d58e1f6 Patch
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*
History

31 Dec 2024, 20:04

Type Values Removed Values Added
First Time Linux linux Kernel
Linux
CWE CWE-416
References () https://git.kernel.org/stable/c/1642f51ac0d4f2b55d5748094c49ff8f7191b93c - () https://git.kernel.org/stable/c/1642f51ac0d4f2b55d5748094c49ff8f7191b93c - Patch
References () https://git.kernel.org/stable/c/258aad75c62146453d03028a44f2f1590d58e1f6 - () https://git.kernel.org/stable/c/258aad75c62146453d03028a44f2f1590d58e1f6 - Patch
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.8
CPE cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

21 Nov 2024, 06:36

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/1642f51ac0d4f2b55d5748094c49ff8f7191b93c - () https://git.kernel.org/stable/c/1642f51ac0d4f2b55d5748094c49ff8f7191b93c -
References () https://git.kernel.org/stable/c/258aad75c62146453d03028a44f2f1590d58e1f6 - () https://git.kernel.org/stable/c/258aad75c62146453d03028a44f2f1590d58e1f6 -
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: scsi: iscsi: corrige el uso after free de iscsi_task. Confirmación d39df158518c ("scsi: iscsi: Have abort handler get ref to conn") se agregaron llamadas iscsi_get_conn()/iscsi_put_conn() durante el manejo de abortos pero luego también cambió el manejo del caso en el que detectamos una tarea ya completada y ahora terminamos haciendo un acceso al código común de put/cleanup. Esto da como resultado un uso de iscsi_task después de la liberación, porque el código de limpieza común colocará iscsi_task. Esto revierte el ir a y mueve iscsi_get_conn() a después de haber verificado si iscsi_task es válido.

21 May 2024, 15:15

Type Values Removed Values Added
New CVE
Information

Published : 2024-05-21 15:15

Updated : 2024-12-31 20:04

NVD link : CVE-2021-47427

Mitre link : CVE-2021-47427

CVE.ORG link : CVE-2021-47427

JSON object : View

Products Affected

linux

CWE
CWE-416

Use After Free