CVE-2026-64087

Summary

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/adcb163ad7cacca317872fc62bd8885e842e45e3
• https://git.kernel.org/stable/c/c2c56092710fe8a893b67b5a3d7e62808d02d84d
• https://git.kernel.org/stable/c/5469e1e7c411acc15fdd8262c99c3ebd9defd594
• https://git.kernel.org/stable/c/f85c81e93dbd6915970bd5f3bffcf62633c4c54c
• https://git.kernel.org/stable/c/0e791cd0140fb136083565aadfbe0f705aa260d0
• https://git.kernel.org/stable/c/75c862adf3d3caab4f49bb3530723c215376e37c
• https://git.kernel.org/stable/c/231db52a5b64d0a9769e298dadc148e1f79b26a6
• https://git.kernel.org/stable/c/4afca954622d672ea65ed961bed01cf91caa034e

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