CVE-2026-64085hwmon: (pmbus/adm1266) bounce blackbox records through a protocol-sized buffer
- 7.8HighCVSS base score
- 0.14%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
Published
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.14% · top 97% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 – < 7896d87cbb05e097efc113243d4e38f9f8cea16c
- affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 – < 9d5309500b4607b7198e19f0a3fa13eb864cd5fb
- affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 – < 6098634cfa711f11a8d65368dc51ec8f7c8241ba
- affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 – < 60c4b9fe1a3dd012014b1f561a6928a0b5db1126
- affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 – < 83e039f0a43e0708515b0479cb7690fb93faaaa0
- affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 – < 97a9cf2a8217ca1cdaf48cb9ab26e471632c7e7f
- affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 – < dd47b8c4a0a8ced442da3f008db28fbbd31feaf0
- affected 407dc802a9c0809ca6a48de4b4c63305eb84ef56 – < 43cae21424ff8e33894a0f86c6b80b840c049fd7
- affected 5.10
- unaffected < 5.10
- unaffected 5.10.258 – ≤ 5.10.*
- unaffected 5.15.209 – ≤ 5.15.*
- unaffected 6.1.175 – ≤ 6.1.*
- unaffected 6.6.142 – ≤ 6.6.*
- unaffected 6.12.92 – ≤ 6.12.*
- unaffected 6.18.34 – ≤ 6.18.*
- unaffected 7.0.11 – ≤ 7.0.*
- unaffected 7.1 – ≤ *
References
References8
- https://git.kernel.org/stable/c/7896d87cbb05e097efc113243d4e38f9f8cea16c (opens in a new tab)
- https://git.kernel.org/stable/c/9d5309500b4607b7198e19f0a3fa13eb864cd5fb (opens in a new tab)
- https://git.kernel.org/stable/c/6098634cfa711f11a8d65368dc51ec8f7c8241ba (opens in a new tab)
- https://git.kernel.org/stable/c/60c4b9fe1a3dd012014b1f561a6928a0b5db1126 (opens in a new tab)
- https://git.kernel.org/stable/c/83e039f0a43e0708515b0479cb7690fb93faaaa0 (opens in a new tab)
- https://git.kernel.org/stable/c/97a9cf2a8217ca1cdaf48cb9ab26e471632c7e7f (opens in a new tab)
- https://git.kernel.org/stable/c/dd47b8c4a0a8ced442da3f008db28fbbd31feaf0 (opens in a new tab)
- https://git.kernel.org/stable/c/43cae21424ff8e33894a0f86c6b80b840c049fd7 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-45658 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-64085)Record last updated .