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

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/00ebdef47994206f60546929a0f6f63285497272
https://git.kernel.org/stable/c/c9fc8428d4255c2128da9c4d5cd92e554d0150cf	Patch
https://git.kernel.org/stable/c/e469922fbdf6ad729e5dc8d49289b5036a0ecdf8
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

30 Oct 2026, 13:17

Type	Values Removed	Values Added
References		() https://git.kernel.org/stable/c/00ebdef47994206f60546929a0f6f63285497272 -

21 Oct 2026, 13:17

Type	Values Removed	Values Added
References		() https://git.kernel.org/stable/c/e469922fbdf6ad729e5dc8d49289b5036a0ecdf8 -

Information

Published : 2024-12-29 09:15

Updated : 2026-10-30 13:17

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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but the error handling\nin udmabuf_create() will tear down the udmabuf without doing anything about\nthe containing dma_buf.\n\nThis leaves a dma_buf in memory that contains a dangling pointer; though\nthat doesn't seem to lead to anything bad except a memory leak.\n\nFix it by moving the dma_buf_fd() call out of export_udmabuf() so that we\ncan give it different error handling.\n\nNote that the shape of this code changed a lot in commit 5e72b2b41a21\n(\"udmabuf: convert udmabuf driver to use folios\"); but the memory leak\nseems to have existed since the introduction of udmabuf."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: udmabuf: reparar p\u00e9rdida de memoria en la \u00faltima ruta de error export_udmabuf() En export_udmabuf(), si dma_buf_fd() falla porque la tabla FD est\u00e1 llena, ya se ha creado un dma_buf que posee el udmabuf; pero la gesti\u00f3n de errores en udmabuf_create() destruir\u00e1 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 p\u00e9rdida de memoria. Arr\u00e9glelo moviendo la llamada dma_buf_fd() fuera de export_udmabuf() para que podamos darle un gesti\u00f3n de errores diferente. Tenga en cuenta que la forma de este c\u00f3digo cambi\u00f3 mucho en el commit 5e72b2b41a21 (\"udmabuf: convertir el controlador udmabuf para usar folios\"); Pero la p\u00e9rdida de memoria parece haber existido desde la introducci\u00f3n de udmabuf."}], "lastModified": "2026-10-30T13:17:48.370", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "132A930B-79DA-4CD0-9863-6D6DAD5DDACA", "versionEndExcluding": "6.12.7", "versionStartIncluding": "4.20"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "62567B3C-6CEE-46D0-BC2E-B3717FBF7D13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5A073481-106D-4B15-B4C7-FB0213B8E1D4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DE491969-75AE-4A6B-9A58-8FC5AF98798F"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}