In the Linux kernel, the following vulnerability has been resolved:

hwmon: (pmbus/adm1266) widen blackbox-info buffer to I2C_SMBUS_BLOCK_MAX

adm1266_nvmem_read_blackbox() declares a 5-byte stack buffer and
passes it to i2c_smbus_read_block_data() to retrieve the 4-byte
BLACKBOX_INFO response.  i2c_smbus_read_block_data() does not honour
caller buffer sizes -- it memcpy()s data.block[0] bytes from the
SMBus transaction (where data.block[0] is the length byte returned by
the slave device, up to I2C_SMBUS_BLOCK_MAX = 32):

	memcpy(values, &data.block[1], data.block[0]);

If the device returns any block length above 5, the call overflows
the caller's 5-byte stack buffer before the post-call

	if (ret != 4)
		return -EIO;

check has a chance to reject the response.

Widen the local buffer to I2C_SMBUS_BLOCK_MAX so the helper has room
for any well-formed SMBus block response, matching the convention used
by the other i2c_smbus_read_block_data() callers in this driver.

https://git.kernel.org/stable/c/0dbf64c502443c08c2e28a77ecbfcc5479d93228

https://git.kernel.org/stable/c/2b7a698d5093b548c464828d984f05ced5f3fd2a

https://git.kernel.org/stable/c/33251abb9c9dd62943be76f0427c5527ee39188f

https://git.kernel.org/stable/c/6ed16a40b162e9d87d9ac8bed4d7f0e3e807700e

https://git.kernel.org/stable/c/7f705e581ef3e6bb308a121a89adf5237d968204

https://git.kernel.org/stable/c/ba09f4baa5bd96c5d26c942defa546a72dbbe5bf

https://git.kernel.org/stable/c/ca560f7566df7e2826c2999e959e6b94eb938f76

https://git.kernel.org/stable/c/eee213daa1e1b402eb631bcd1b8c5aa340a6b081

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