What’s Vulnerable › Vulnerabilities

CVE-2023-53220: media: az6007: Fix null-ptr-deref in az6007_i2c_xfer()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-15 · updated 2026-06-17
• Weakness: CWE-476

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()")

Affected products

• Linux kernel: before 4.14.326; from 4.15 before 4.19.295; from 4.20 before 5.4.257; from 5.5 before 5.10.197; from 5.11 before 5.15.133; from 5.16 before 6.1.55 — fixed in 4.14.326, 4.19.295, 5.10.197, 5.15.133, 5.4.257, 6.1.55

How to fix

Upgrade to a fixed version: Linux kernel 4.14.326, 4.19.295, 5.10.197, 5.15.133. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1047f9343011f2cedc73c64829686206a7e9fc3f
• https://git.kernel.org/stable/c/5b1ea100ad3695025969dc4693f307877fb688d6
• https://git.kernel.org/stable/c/6ab7ea4e17d6a605d05308adf8f3408924770cba
• https://git.kernel.org/stable/c/991c77fe18c6f374bbf83376f8c42550aa565662
• https://git.kernel.org/stable/c/a1110f19d4940e4185251d072cbb0ff51486a1e7
• https://git.kernel.org/stable/c/a9def3e9718a4dc756f48db147d42ec41a966240
• https://git.kernel.org/stable/c/adcb73f8ce9aec48b1f85223f401c1574015d8d2
• https://git.kernel.org/stable/c/c6763fefa267f6e62595a6ac1f57815d99fc90b7

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