CVE-2023-53220
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-15

Last updated on: 2025-12-03

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: media: az6007: Fix null-ptr-deref in az6007_i2c_xfer() In az6007_i2c_xfer, msg is controlled by user. When msg[i].buf is null and msg[i].len is zero, former checks on msg[i].buf would be passed. Malicious data finally reach az6007_i2c_xfer. If accessing msg[i].buf[0] without sanity check, null ptr deref would happen. We add check on msg[i].len to prevent crash. Similar commit: commit 0ed554fd769a ("media: dvb-usb: az6027: fix null-ptr-deref in az6027_i2c_xfer()")
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Meta Information
Published
2025-09-15
Last Modified
2025-12-03
Generated
2026-06-16
AI Q&A
2025-09-15
EPSS Evaluated
2026-06-15
NVD
CVE-2023-53220
Affected Vendors & Products
Showing 7 associated CPEs
Vendor Product Version / Range
linux linux_kernel to 4.14.326 (exc)
linux linux_kernel From 4.15 (inc) to 4.19.295 (exc)
linux linux_kernel From 4.20 (inc) to 5.4.257 (exc)
linux linux_kernel From 5.5 (inc) to 5.10.197 (exc)
linux linux_kernel From 5.11 (inc) to 5.15.133 (exc)
linux linux_kernel From 5.16 (inc) to 6.1.55 (exc)
linux linux_kernel From 6.2 (inc) to 6.5.5 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.
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Executive Summary

This vulnerability is a null pointer dereference in the Linux kernel's az6007 driver, specifically in the az6007_i2c_xfer function. The issue occurs because the function processes a message (msg) controlled by the user. If msg[i].buf is null and msg[i].len is zero, previous checks on msg[i].buf are bypassed, leading to a situation where the function accesses msg[i].buf[0] without verifying if msg[i].buf is valid. This causes a null pointer dereference, potentially crashing the system. The fix involves adding a check on msg[i].len to prevent this crash.

Impact Analysis

This vulnerability can cause a system crash due to a null pointer dereference when processing specially crafted messages in the az6007 driver. An attacker controlling the input to az6007_i2c_xfer could exploit this to cause a denial of service by crashing the kernel.

Mitigation Strategies

To mitigate this vulnerability, update the Linux kernel to a version that includes the fix for the null pointer dereference in az6007_i2c_xfer. The fix adds a check on msg[i].len to prevent the crash caused by null pointer dereference. Applying the latest kernel patches or updates from your Linux distribution is recommended.

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