CVE-2026-64083hwmon: (pmbus/adm1266) reject short block-read responses in the GPIO accessors
- 5.5MediumCVSS base score
- 0.13%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) reject short block-read responses in the GPIO accessors adm1266_gpio_get() and adm1266_gpio_get_multiple() both compose the pin-status word as pins_status = read_buf[0] + (read_buf[1] << 8); right after i2c_smbus_read_block_data(), guarding only against an error return. A well-behaved device returns 2 bytes for GPIO_STATUS/PDIO_STATUS, but the helper happily reports a 0- or 1-byte response too. If the device returns 0 bytes, both read_buf slots are uninitialized stack memory; if it returns 1 byte, read_buf[1] is. The composed value then flows through set_bit() into the caller's *bits in adm1266_gpio_get_multiple(), or into the return value of adm1266_gpio_get(), and ends up in userspace via gpiolib (sysfs and the char-dev ioctls). That leaks a few bits of kernel stack per request on any device whose firmware glitch, bus error, or hostile slave produces a short block-read response. Add the missing length check to both call sites and surface a short response as -EIO.
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)
- 0.13% · top 98% of all CVEs (12 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 d98dfad35c38c037b37c4adc99df01da571031a5 – < fd9196aad9e5a3845cea17de3405ebc700382142
- affected d98dfad35c38c037b37c4adc99df01da571031a5 – < ee4799becf7d2af3778007e22c2e55c4009a49c7
- affected d98dfad35c38c037b37c4adc99df01da571031a5 – < c603b6c6840ac0c6285f5eefea0de6242710af21
- affected d98dfad35c38c037b37c4adc99df01da571031a5 – < a2d1c819348b36fccbbfcf37c5fa7a50a9b4528f
- affected d98dfad35c38c037b37c4adc99df01da571031a5 – < ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946
- affected d98dfad35c38c037b37c4adc99df01da571031a5 – < eb3cd9bb590460c6127145cb245be925d23f5232
- affected d98dfad35c38c037b37c4adc99df01da571031a5 – < 64fa9328948ddcc0f7f3c23ea1756c126d9dffac
- affected d98dfad35c38c037b37c4adc99df01da571031a5 – < a7232f68c43ca62f545049b7f5fbfc75137b843b
- 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/fd9196aad9e5a3845cea17de3405ebc700382142 (opens in a new tab)
- https://git.kernel.org/stable/c/ee4799becf7d2af3778007e22c2e55c4009a49c7 (opens in a new tab)
- https://git.kernel.org/stable/c/c603b6c6840ac0c6285f5eefea0de6242710af21 (opens in a new tab)
- https://git.kernel.org/stable/c/a2d1c819348b36fccbbfcf37c5fa7a50a9b4528f (opens in a new tab)
- https://git.kernel.org/stable/c/ae25cf2ea9ebd06d7ad416647dbdc7b5d0172946 (opens in a new tab)
- https://git.kernel.org/stable/c/eb3cd9bb590460c6127145cb245be925d23f5232 (opens in a new tab)
- https://git.kernel.org/stable/c/64fa9328948ddcc0f7f3c23ea1756c126d9dffac (opens in a new tab)
- https://git.kernel.org/stable/c/a7232f68c43ca62f545049b7f5fbfc75137b843b (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-2026-45656 (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-2026-64083)Record last updated .