CVE-2026-64085hwmon: (pmbus/adm1266) bounce blackbox records through a protocol-sized buffer
Updated under an hour ago ()
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In the Linux kernel, the following vulnerability has been resolved: hwmon: (pmbus/adm1266) bounce blackbox records through a protocol-sized buffer adm1266_pmbus_block_xfer() copies the device-supplied block payload into the caller-provided buffer using the device-supplied length: memcpy(data_r, &msgs[1].buf[1], msgs[1].buf[0]); The helper does not know how large data_r is and trusts the device to return at most one record's worth of bytes. adm1266_nvmem_read_blackbox() violates that contract: it advances read_buff inside data->dev_mem in ADM1266_BLACKBOX_SIZE (64-byte) strides while the helper is willing to write up to ADM1266_PMBUS_BLOCK_MAX (255) bytes. A device that returns more than 64 bytes on the trailing record (read_buff offset 1984 in the 2048-byte dev_mem allocation) overflows dev_mem by up to 191 bytes before the post-call if (ret != ADM1266_BLACKBOX_SIZE) return -EIO; can reject the response. Contain the fix in the caller without changing the helper signature: read each record into a 255-byte local bounce buffer that matches the helper's maximum output, validate the returned length, and only then copy exactly ADM1266_BLACKBOX_SIZE bytes into the dev_mem slot.
- CVSS
- 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Jul 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 407dc802a9c0809ca6a48de4b4c63305eb84ef56 before 7896d87cbb05e097efc113243d4e38f9f8cea16c; 407dc802a9c0809ca6a48de4b4c63305eb84ef56 builds before 9d5309500b4607b7198e19f0a3fa13eb864cd5fb; from 407dc802a9c0809ca6a48de4b4c63305eb84ef56 before 6098634cfa711f11a8d65368dc51ec8f7c8241ba; 407dc802a9c0809ca6a48de4b4c63305eb84ef56 builds before 60c4b9fe1a3dd012014b1f561a6928a0b5db1126; 407dc802a9c0809ca6a48de4b4c63305eb84ef56 builds before 83e039f0a43e0708515b0479cb7690fb93faaaa0; 407dc802a9c0809ca6a48de4b4c63305eb84ef56 builds before 97a9cf2a8217ca1cdaf48cb9ab26e471632c7e7f; from 407dc802a9c0809ca6a48de4b4c63305eb84ef56 before dd47b8c4a0a8ced442da3f008db28fbbd31feaf0; 407dc802a9c0809ca6a48de4b4c63305eb84ef56 builds before 43cae21424ff8e33894a0f86c6b80b840c049fd7 | CNA record |
linux linux_kernel linux:linux_kernel | from 5.10 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.142; from 6.7 before 6.12.92; from 6.13 before 6.18.34; from 6.19 before 7.0.11; 7.1; and 3 more ranges | NVD |
References
- https://git.kernel.org/stable/c/7896d87cbb05e097efc113243d4e38f9f8cea16cpatch
- https://git.kernel.org/stable/c/9d5309500b4607b7198e19f0a3fa13eb864cd5fbpatch
- https://git.kernel.org/stable/c/6098634cfa711f11a8d65368dc51ec8f7c8241bapatch
- https://git.kernel.org/stable/c/60c4b9fe1a3dd012014b1f561a6928a0b5db1126patch
- https://git.kernel.org/stable/c/83e039f0a43e0708515b0479cb7690fb93faaaa0patch
- https://git.kernel.org/stable/c/97a9cf2a8217ca1cdaf48cb9ab26e471632c7e7fpatch
- https://git.kernel.org/stable/c/dd47b8c4a0a8ced442da3f008db28fbbd31feaf0patch
- https://git.kernel.org/stable/c/43cae21424ff8e33894a0f86c6b80b840c049fd7patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.