Linux Kernel up to 6.18.21/6.19.11 hwmon i2c_smbus_read_block_data out-of-bounds

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.18.21/6.19.11. It has been declared as critical. This impacts the function i2c_smbus_read_block_data of the component hwmon. Executing a manipulation can lead to out-of-bounds. This vulnerability appears as CVE-2026-43005. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.18.21/6.19.11 and classified as problematic. This vulnerability affects the function i2c_smbus_read_block_data of the component hwmon. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: hwmon: (tps53679) Fix array access with zero-length block read i2c_smbus_read_block_data() can return 0, indicating a zero-length read. When this happens, tps53679_identify_chip() accesses buf[ret - 1] which is buf[-1], reading one byte before the buffer on the stack. Fix by changing the check from "ret < 0" to "ret <= 0", treating a zero-length read as an error (-EIO), which prevents the out-of-bounds array access. Also fix a typo in the adjacent comment: "if present" instead of duplicate "if".

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-43005 since 05/01/2026. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 05/01/2026).

Upgrading to version 6.18.22 or 6.19.12 eliminates this vulnerability. Applying the patch 79b7e588399bb55f4c10bea6ca41b6c3b944d2bb/6999b4769e2a61c463158927102e8c07e3f69ba2/0e211f6aaa6a00fd0ee0c1eea5498f168c6725e6 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.18.0
• 6.18.1
• 6.18.2
• 6.18.3
• 6.18.4
• 6.18.5
• 6.18.6
• 6.18.7
• 6.18.8
• 6.18.9
• 6.18.10
• 6.18.11
• 6.18.12
• 6.18.13
• 6.18.14
• 6.18.15
• 6.18.16
• 6.18.17
• 6.18.18
• 6.18.19
• 6.18.20
• 6.18.21
• 6.19.0
• 6.19.1
• 6.19.2
• 6.19.3
• 6.19.4
• 6.19.5
• 6.19.6
• 6.19.7
• 6.19.8
• 6.19.9
• 6.19.10
• 6.19.11

License

• open-source

Website

• Vendor: https://www.kernel.org/

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