CVE-2026-64087
Low risk· EPSS 8%Exploitation Probability (EPSS)
Low risk8th percentile - higher than 8% of all known CVEs
Summary
In the Linux kernel's pmbus/adm1266 driver, a vulnerability was found due to missing validation of the record count in the BLACKBOX_INFO response. An attacker can supply an inflated value, causing an out-of-bounds read beyond the allocated buffer and potential memory corruption.
Risk Assessment
The organization is at risk of system crash or privilege escalation if the vulnerability is exploited by a local attacker with access to the PMBus. This could lead to data integrity loss or disruption of critical hardware monitoring systems.
Recommendation
Immediately update the Linux kernel to a version containing the fix that caps the record count at 32 and returns -EIO on larger values. Check your distribution for the available patch.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/adm1266) reject implausible blackbox record_count adm1266_nvmem_read_blackbox() loops over a record_count that comes straight from byte 3 of the BLACKBOX_INFO response. The destination buffer is data->dev_mem, sized for the nvmem cell's declared 2048 bytes (ADM1266_BLACKBOX_MAX_RECORDS * ADM1266_BLACKBOX_SIZE = 32 * 64). A device that reports a record_count greater than 32 -- whether due to firmware bugs, bus corruption, or a non-responsive slave returning 0xff -- would walk read_buff past the end of the dev_mem allocation on the trailing iterations. Cap record_count at ADM1266_BLACKBOX_MAX_RECORDS (introduced here) before entering the loop and return -EIO on any larger value, so a malformed BLACKBOX_INFO response cannot drive the loop out of bounds.