CVE-2026-64135hwmon: (pmbus/adm1266) widen blackbox-info buffer to I2C_SMBUS_BLOCK_MAX
- 5.5MediumCVSS base score
- 0.12%Exploitation in 30 daysEPSS · top 98% 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) widen blackbox-info buffer to I2C_SMBUS_BLOCK_MAX adm1266_nvmem_read_blackbox() declares a 5-byte stack buffer and passes it to i2c_smbus_read_block_data() to retrieve the 4-byte BLACKBOX_INFO response. i2c_smbus_read_block_data() does not honour caller buffer sizes -- it memcpy()s data.block[0] bytes from the SMBus transaction (where data.block[0] is the length byte returned by the slave device, up to I2C_SMBUS_BLOCK_MAX = 32): memcpy(values, &data.block[1], data.block[0]); If the device returns any block length above 5, the call overflows the caller's 5-byte stack buffer before the post-call if (ret != 4) return -EIO; check has a chance to reject the response. Widen the local buffer to I2C_SMBUS_BLOCK_MAX so the helper has room for any well-formed SMBus block response, matching the convention used by the other i2c_smbus_read_block_data() callers in this driver.
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 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.12% · top 98% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 15609d1893020436e1e8ccfd9ded774a96dd17a2 – < 33251abb9c9dd62943be76f0427c5527ee39188f
- affected 15609d1893020436e1e8ccfd9ded774a96dd17a2 – < ba09f4baa5bd96c5d26c942defa546a72dbbe5bf
- affected 15609d1893020436e1e8ccfd9ded774a96dd17a2 – < 6ed16a40b162e9d87d9ac8bed4d7f0e3e807700e
- affected 15609d1893020436e1e8ccfd9ded774a96dd17a2 – < 0dbf64c502443c08c2e28a77ecbfcc5479d93228
- affected 15609d1893020436e1e8ccfd9ded774a96dd17a2 – < 2b7a698d5093b548c464828d984f05ced5f3fd2a
- affected 15609d1893020436e1e8ccfd9ded774a96dd17a2 – < ca560f7566df7e2826c2999e959e6b94eb938f76
- affected 15609d1893020436e1e8ccfd9ded774a96dd17a2 – < 7f705e581ef3e6bb308a121a89adf5237d968204
- affected 15609d1893020436e1e8ccfd9ded774a96dd17a2 – < eee213daa1e1b402eb631bcd1b8c5aa340a6b081
- 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/33251abb9c9dd62943be76f0427c5527ee39188f (opens in a new tab)
- https://git.kernel.org/stable/c/ba09f4baa5bd96c5d26c942defa546a72dbbe5bf (opens in a new tab)
- https://git.kernel.org/stable/c/6ed16a40b162e9d87d9ac8bed4d7f0e3e807700e (opens in a new tab)
- https://git.kernel.org/stable/c/0dbf64c502443c08c2e28a77ecbfcc5479d93228 (opens in a new tab)
- https://git.kernel.org/stable/c/2b7a698d5093b548c464828d984f05ced5f3fd2a (opens in a new tab)
- https://git.kernel.org/stable/c/ca560f7566df7e2826c2999e959e6b94eb938f76 (opens in a new tab)
- https://git.kernel.org/stable/c/7f705e581ef3e6bb308a121a89adf5237d968204 (opens in a new tab)
- https://git.kernel.org/stable/c/eee213daa1e1b402eb631bcd1b8c5aa340a6b081 (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-2026-45820 (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-2026-64135)Record last updated .