Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2023-53244

Severity CVSS v4.0:
Pending analysis
Type:
CWE-476 NULL Pointer Dereference
Publication date:
15/09/2025
Last modified:
14/01/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> media: pci: tw68: Fix null-ptr-deref bug in buf prepare and finish<br /> <br /> When the driver calls tw68_risc_buffer() to prepare the buffer, the<br /> function call dma_alloc_coherent may fail, resulting in a empty buffer<br /> buf-&gt;cpu. Later when we free the buffer or access the buffer, null ptr<br /> deref is triggered.<br /> <br /> This bug is similar to the following one:<br /> https://git.linuxtv.org/media_stage.git/commit/?id=2b064d91440b33fba5b452f2d1b31f13ae911d71.<br /> <br /> We believe the bug can be also dynamically triggered from user side.<br /> Similarly, we fix this by checking the return value of tw68_risc_buffer()<br /> and the value of buf-&gt;cpu before buffer free.

Impact

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

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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

Base Score 3.x
5.50
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.15.113 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.16 (including) 6.1.30 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 6.2 (including) 6.3.4 (excluding)

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


References to Advisories, Solutions, and Tools