CVE-2026-45865mctp i2c: initialise event handler read bytes
- 5.5MediumCVSS base score
- 0.16%Exploitation in 30 daysEPSS · top 95% 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: mctp i2c: initialise event handler read bytes Set a 0xff value for i2c reads of an mctp-i2c device. Otherwise reads will return "val" from the i2c bus driver. For i2c-aspeed and i2c-npcm7xx that is a stack uninitialised u8. Tested with "i2ctransfer -y 1 r10@0x34" where 0x34 is a mctp-i2c instance, now it returns all 0xff.
Timeline
ID reserved
By Linux
- 14 days later
· 14 days later
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)
- 0.16% · top 95% 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 f5b8abf9fc3dacd7529d363e26fe8230935d65f8 – < 93e01e837e105299f1c259ef71f6e1ec4fe806e3
- affected f5b8abf9fc3dacd7529d363e26fe8230935d65f8 – < 11f83253244060b5de5eac787f61ae3f3e559d01
- affected f5b8abf9fc3dacd7529d363e26fe8230935d65f8 – < fa9861e5c8af7651dddfa8d490aaada17ae33b6c
- affected f5b8abf9fc3dacd7529d363e26fe8230935d65f8 – < 6ff2ebfef75fbc57d937d8fbe738b967edf2d331
- affected f5b8abf9fc3dacd7529d363e26fe8230935d65f8 – < 1eeedb310229bfee9dd4d992e5bba33fe1378a8f
- affected f5b8abf9fc3dacd7529d363e26fe8230935d65f8 – < 2a14e91b6d76639dac70ea170f4384c1ee3cb48d
- affected 5.18
- unaffected < 5.18
- unaffected 6.1.165 – ≤ 6.1.*
- unaffected 6.6.128 – ≤ 6.6.*
- unaffected 6.12.75 – ≤ 6.12.*
- unaffected 6.18.14 – ≤ 6.18.*
- unaffected 6.19.4 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References6
- https://git.kernel.org/stable/c/93e01e837e105299f1c259ef71f6e1ec4fe806e3 (opens in a new tab)
- https://git.kernel.org/stable/c/11f83253244060b5de5eac787f61ae3f3e559d01 (opens in a new tab)
- https://git.kernel.org/stable/c/fa9861e5c8af7651dddfa8d490aaada17ae33b6c (opens in a new tab)
- https://git.kernel.org/stable/c/6ff2ebfef75fbc57d937d8fbe738b967edf2d331 (opens in a new tab)
- https://git.kernel.org/stable/c/1eeedb310229bfee9dd4d992e5bba33fe1378a8f (opens in a new tab)
- https://git.kernel.org/stable/c/2a14e91b6d76639dac70ea170f4384c1ee3cb48d (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-2026-32331 (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-2026-45865)Record last updated .