- —Not scoredno CVSS score yet
- 0.17%Exploitation in 30 daysEPSS · top 93% 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: x86/tdx: Fix off-by-one in port I/O handling handle_in() and handle_out() in arch/x86/coco/tdx/tdx.c use: u64 mask = GENMASK(BITS_PER_BYTE * size, 0); GENMASK(h, l) includes bit h. For size=1 (INB), this produces GENMASK(8, 0) = 0x1FF (9 bits) instead of GENMASK(7, 0) = 0xFF (8 bits). The mask is one bit too wide for all I/O sizes. Fix the mask calculation.
Timeline
ID reserved
By Linux
Published
- 38 days later
· 38 days later
Record updated
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
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.17% · top 93% of all CVEs (10 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 03149948832a078f759022ed5b92e722d8d23c26 – < c6875423ad849ac234ab9812eb72f37ff8a490b4
- affected 03149948832a078f759022ed5b92e722d8d23c26 – < 220011fe95fc78b2bc2d7d43893bc73957a5c811
- affected 03149948832a078f759022ed5b92e722d8d23c26 – < 222b7005e4519f633b4cd666226256abbab46a1a
- affected 03149948832a078f759022ed5b92e722d8d23c26 – < c4a22154870813d10aa0b4c734a574c726f9d4b0
- affected 03149948832a078f759022ed5b92e722d8d23c26 – < bb45f705c4440dd3c689328319b88dd28770bbb8
- affected 03149948832a078f759022ed5b92e722d8d23c26 – < 0f63e656b1c679d32ac595de29d10c03efca6a25
- affected 5.19
- unaffected < 5.19
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.109 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
6
- https://git.kernel.org/stable/c/c6875423ad849ac234ab9812eb72f37ff8a490b4 (opens in a new tab)
- https://git.kernel.org/stable/c/220011fe95fc78b2bc2d7d43893bc73957a5c811 (opens in a new tab)
- https://git.kernel.org/stable/c/222b7005e4519f633b4cd666226256abbab46a1a (opens in a new tab)
- https://git.kernel.org/stable/c/c4a22154870813d10aa0b4c734a574c726f9d4b0 (opens in a new tab)
- https://git.kernel.org/stable/c/bb45f705c4440dd3c689328319b88dd28770bbb8 (opens in a new tab)
- https://git.kernel.org/stable/c/0f63e656b1c679d32ac595de29d10c03efca6a25 (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-2026-76663 (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-2026-89751)Record last updated .