Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2022-49935

Severity CVSS v4.0:
Pending analysis
Type:
CWE-416 Use After Free
Publication date:
18/06/2025
Last modified:
14/11/2025

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> dma-buf/dma-resv: check if the new fence is really later<br /> <br /> Previously when we added a fence to a dma_resv object we always<br /> assumed the the newer than all the existing fences.<br /> <br /> With Jason&amp;#39;s work to add an UAPI to explicit export/import that&amp;#39;s not<br /> necessary the case any more. So without this check we would allow<br /> userspace to force the kernel into an use after free error.<br /> <br /> Since the change is very small and defensive it&amp;#39;s probably a good<br /> idea to backport this to stable kernels as well just in case others<br /> are using the dma_resv object in the same way.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.80 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
7.80
Severity 3.x
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.0 (including) 5.19.8 (excluding)
cpe:2.3:o:linux:linux_kernel:6.0:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0:rc3:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools