Linux kernel ADM1266 blackbox record_count OOB buffer overflow
CVE-2026-64087 Published on July 19, 2026
hwmon: (pmbus/adm1266) reject implausible blackbox record_count
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.
Products Associated with CVE-2026-64087
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Affected Versions
Linux:- Version 15609d1893020436e1e8ccfd9ded774a96dd17a2 and below adcb163ad7cacca317872fc62bd8885e842e45e3 is affected.
- Version 15609d1893020436e1e8ccfd9ded774a96dd17a2 and below c2c56092710fe8a893b67b5a3d7e62808d02d84d is affected.
- Version 15609d1893020436e1e8ccfd9ded774a96dd17a2 and below 5469e1e7c411acc15fdd8262c99c3ebd9defd594 is affected.
- Version 15609d1893020436e1e8ccfd9ded774a96dd17a2 and below f85c81e93dbd6915970bd5f3bffcf62633c4c54c is affected.
- Version 15609d1893020436e1e8ccfd9ded774a96dd17a2 and below 0e791cd0140fb136083565aadfbe0f705aa260d0 is affected.
- Version 15609d1893020436e1e8ccfd9ded774a96dd17a2 and below 75c862adf3d3caab4f49bb3530723c215376e37c is affected.
- Version 15609d1893020436e1e8ccfd9ded774a96dd17a2 and below 231db52a5b64d0a9769e298dadc148e1f79b26a6 is affected.
- Version 15609d1893020436e1e8ccfd9ded774a96dd17a2 and below 4afca954622d672ea65ed961bed01cf91caa034e is affected.
- Version 5.10 is affected.
- Before 5.10 is unaffected.
- Version 5.10.258, <= 5.10.* is unaffected.
- Version 5.15.209, <= 5.15.* is unaffected.
- Version 6.1.175, <= 6.1.* is unaffected.
- Version 6.6.142, <= 6.6.* is unaffected.
- Version 6.12.92, <= 6.12.* is unaffected.
- Version 6.18.34, <= 6.18.* is unaffected.
- Version 7.0.11, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.