CVE-2026-64087
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.
Does this matter?
Lower severity and a low EPSS score (0.13%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.13% probability · 3th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0e791cd0140fb136083565aadfbe0f705aa260d0Patch
- https://git.kernel.org/stable/c/231db52a5b64d0a9769e298dadc148e1f79b26a6Patch
- https://git.kernel.org/stable/c/4afca954622d672ea65ed961bed01cf91caa034ePatch
- https://git.kernel.org/stable/c/5469e1e7c411acc15fdd8262c99c3ebd9defd594Patch
- https://git.kernel.org/stable/c/75c862adf3d3caab4f49bb3530723c215376e37cPatch
- https://git.kernel.org/stable/c/adcb163ad7cacca317872fc62bd8885e842e45e3Patch
- https://git.kernel.org/stable/c/c2c56092710fe8a893b67b5a3d7e62808d02d84dPatch
- https://git.kernel.org/stable/c/f85c81e93dbd6915970bd5f3bffcf62633c4c54cPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.