CVE-2021-47123

In the Linux kernel, the following vulnerability has been resolved: io_uring: fix ltout double free on completion race Always remove linked timeout on io_link_timeout_fn() from the master request link list, otherwise we may get use-after-free when first io_link_timeout_fn() puts linked timeout in the fail path, and then will be found and put on master's free.

CVSS v3 7.8 HIGH

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

References

Link	Resource
https://git.kernel.org/stable/c/1f64f5e903b9d1d157875721e02adadc9d6f0a5d	Patch
https://git.kernel.org/stable/c/447c19f3b5074409c794b350b10306e1da1ef4ba	Patch
https://git.kernel.org/stable/c/1f64f5e903b9d1d157875721e02adadc9d6f0a5d	Patch
https://git.kernel.org/stable/c/447c19f3b5074409c794b350b10306e1da1ef4ba	Patch

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel:5.13:rc1::::::

History

14 Jan 2025, 15:02

Type	Values Removed	Values Added
References	~~() https://git.kernel.org/stable/c/1f64f5e903b9d1d157875721e02adadc9d6f0a5d -~~	() https://git.kernel.org/stable/c/1f64f5e903b9d1d157875721e02adadc9d6f0a5d - Patch
References	~~() https://git.kernel.org/stable/c/447c19f3b5074409c794b350b10306e1da1ef4ba -~~	() https://git.kernel.org/stable/c/447c19f3b5074409c794b350b10306e1da1ef4ba - Patch
CPE		cpe:2.3:o:linux:linux_kernel:::::::: cpe:2.3:o:linux:linux_kernel:5.13:rc1::::::
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 7.8
First Time		Linux Linux linux Kernel
CWE		CWE-416 CWE-415

21 Nov 2024, 06:35

Type	Values Removed	Values Added
References	~~() https://git.kernel.org/stable/c/1f64f5e903b9d1d157875721e02adadc9d6f0a5d -~~	() https://git.kernel.org/stable/c/1f64f5e903b9d1d157875721e02adadc9d6f0a5d -
References	~~() https://git.kernel.org/stable/c/447c19f3b5074409c794b350b10306e1da1ef4ba -~~	() https://git.kernel.org/stable/c/447c19f3b5074409c794b350b10306e1da1ef4ba -
Summary		(es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: io_uring: corrige la doble liberación de ltout al finalizar la ejecución. Elimina siempre el tiempo de espera vinculado en io_link_timeout_fn() de la lista de vínculos de solicitud maestra; de lo contrario, es posible que obtengamos use-after-free la primera vez que io_link_timeout_fn() coloca el tiempo de espera vinculado en la ruta de falla, y luego será encontrado y puesto en master gratis.

15 Mar 2024, 21:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2024-03-15 21:15

Updated : 2025-01-14 15:02

NVD link : CVE-2021-47123

Mitre link : CVE-2021-47123

CVE.ORG link : CVE-2021-47123

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-415

Double Free

CWE-416

Use After Free

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7.8 /10