CVE-2024-56712

In the Linux kernel, the following vulnerability has been resolved: udmabuf: fix memory leak on last export_udmabuf() error path In export_udmabuf(), if dma_buf_fd() fails because the FD table is full, a dma_buf owning the udmabuf has already been created; but the error handling in udmabuf_create() will tear down the udmabuf without doing anything about the containing dma_buf. This leaves a dma_buf in memory that contains a dangling pointer; though that doesn't seem to lead to anything bad except a memory leak. Fix it by moving the dma_buf_fd() call out of export_udmabuf() so that we can give it different error handling. Note that the shape of this code changed a lot in commit 5e72b2b41a21 ("udmabuf: convert udmabuf driver to use folios"); but the memory leak seems to have existed since the introduction of udmabuf.

CVSS v3 5.5 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/c9fc8428d4255c2128da9c4d5cd92e554d0150cf	Patch
https://git.kernel.org/stable/c/f49856f525acd5bef52ae28b7da2e001bbe7439e	Patch

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel:6.13:rc1::::::
	cpe:2.3:o:linux:linux_kernel:6.13:rc2::::::
	cpe:2.3:o:linux:linux_kernel:6.13:rc3::::::

History

06 Jan 2025, 17:11

Type	Values Removed	Values Added
CPE		cpe:2.3:o:linux:linux_kernel:::::::: cpe:2.3:o:linux:linux_kernel:6.13:rc3:::::: cpe:2.3:o:linux:linux_kernel:6.13:rc1:::::: cpe:2.3:o:linux:linux_kernel:6.13:rc2::::::
First Time		Linux linux Kernel Linux
CWE		CWE-401
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 5.5
Summary		(es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: udmabuf: reparar pérdida de memoria en la última ruta de error export_udmabuf() En export_udmabuf(), si dma_buf_fd() falla porque la tabla FD está llena, ya se ha creado un dma_buf que posee el udmabuf; pero la gestión de errores en udmabuf_create() destruirá el udmabuf sin hacer nada con el dma_buf que lo contiene. Esto deja un dma_buf en la memoria que contiene un puntero colgante; aunque eso no parece conducir a nada malo excepto a una pérdida de memoria. Arréglelo moviendo la llamada dma_buf_fd() fuera de export_udmabuf() para que podamos darle un gestión de errores diferente. Tenga en cuenta que la forma de este código cambió mucho en el commit 5e72b2b41a21 ("udmabuf: convertir el controlador udmabuf para usar folios"); Pero la pérdida de memoria parece haber existido desde la introducción de udmabuf.
References	~~() https://git.kernel.org/stable/c/c9fc8428d4255c2128da9c4d5cd92e554d0150cf -~~	() https://git.kernel.org/stable/c/c9fc8428d4255c2128da9c4d5cd92e554d0150cf - Patch
References	~~() https://git.kernel.org/stable/c/f49856f525acd5bef52ae28b7da2e001bbe7439e -~~	() https://git.kernel.org/stable/c/f49856f525acd5bef52ae28b7da2e001bbe7439e - Patch

29 Dec 2024, 09:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2024-12-29 09:15

Updated : 2025-04-17 21:15

NVD link : CVE-2024-56712

Mitre link : CVE-2024-56712

CVE.ORG link : CVE-2024-56712

JSON object : View

Products Affected

linux

linux_kernel

CWE

CWE-401

Missing Release of Memory after Effective Lifetime

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5.5 /10