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.
References
Configurations
Configuration 1 (hide)
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History
No history.
Information
Published : 2026-07-19 16:17
Updated : 2026-08-13 15:08
NVD link : CVE-2026-64135
Mitre link : CVE-2026-64135
CVE.ORG link : CVE-2026-64135
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-674
Uncontrolled Recursion