CVE-2024-35939

dma-direct: Leak pages on dma_set_decrypted() failure

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:

dma-direct: Leak pages on dma_set_decrypted() failure

On TDX it is possible for the untrusted host to cause
set_memory_encrypted() or set_memory_decrypted() to fail such that an
error is returned and the resulting memory is shared. Callers need to
take care to handle these errors to avoid returning decrypted (shared)
memory to the page allocator, which could lead to functional or security
issues.

DMA could free decrypted/shared pages if dma_set_decrypted() fails. This
should be a rare case. Just leak the pages in this case instead of
freeing them.

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: dma-direct: páginas filtradas en el fallo de dma_set_decrypted() En TDX es posible que el host que no es de confianza provoque que set_memory_encrypted() o set_memory_decrypted() falle de modo que se devuelva un error y la memoria resultante se comparte. Las personas que llaman deben tener cuidado al manejar estos errores para evitar devolver memoria descifrada (compartida) al asignador de páginas, lo que podría provocar problemas funcionales o de seguridad. DMA podría liberar páginas descifradas/compartidas si dma_set_decrypted() falla. Este debería ser un caso raro. En este caso, simplemente filtre las páginas en lugar de liberarlas.

*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

2024-05-17 CVE Reserved
2024-05-19 CVE Published
2024-05-20 EPSS Updated
2024-11-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (6)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/4e0cfb25d49da2e6261ad582f58ffa5b5dd8c8e9	2024-04-13
https://git.kernel.org/stable/c/4031b72ca747a1e6e9ae4fa729e765b43363d66a	2024-04-13
https://git.kernel.org/stable/c/b57326c96b7bc7638aa8c44e12afa2defe0c934c	2024-04-13
https://git.kernel.org/stable/c/b9fa16949d18e06bdf728a560f5c8af56d2bdcaf	2024-02-28

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2024-35939	2024-11-12
https://bugzilla.redhat.com/show_bug.cgi?id=2281817	2024-11-12

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"				< 6.1.86 Search vendor "Linux" for product "Linux Kernel" and version " < 6.1.86"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 6.6.27 Search vendor "Linux" for product "Linux Kernel" and version " < 6.6.27"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 6.8.6 Search vendor "Linux" for product "Linux Kernel" and version " < 6.8.6"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 6.9 Search vendor "Linux" for product "Linux Kernel" and version " < 6.9"		en		Affected