CVE-2026-89751
x86/tdx: Fix off-by-one in port I/O handling
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Sep 11, 2026 |
| Last Updated | Sep 14, 2026 |
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Affected Versions
Linux / Linux
03149948832a078f759022ed5b92e722d8d23c26 < c6875423ad849ac234ab9812eb72f37ff8a490b4 03149948832a078f759022ed5b92e722d8d23c26 < 220011fe95fc78b2bc2d7d43893bc73957a5c811 03149948832a078f759022ed5b92e722d8d23c26 < 222b7005e4519f633b4cd666226256abbab46a1a 03149948832a078f759022ed5b92e722d8d23c26 < c4a22154870813d10aa0b4c734a574c726f9d4b0 03149948832a078f759022ed5b92e722d8d23c26 < bb45f705c4440dd3c689328319b88dd28770bbb8 03149948832a078f759022ed5b92e722d8d23c26 < 0f63e656b1c679d32ac595de29d10c03efca6a25
Linux / Linux
5.19
References
git.kernel.org: https://git.kernel.org/stable/c/c6875423ad849ac234ab9812eb72f37ff8a490b4 git.kernel.org: https://git.kernel.org/stable/c/220011fe95fc78b2bc2d7d43893bc73957a5c811 git.kernel.org: https://git.kernel.org/stable/c/222b7005e4519f633b4cd666226256abbab46a1a git.kernel.org: https://git.kernel.org/stable/c/c4a22154870813d10aa0b4c734a574c726f9d4b0 git.kernel.org: https://git.kernel.org/stable/c/bb45f705c4440dd3c689328319b88dd28770bbb8 git.kernel.org: https://git.kernel.org/stable/c/0f63e656b1c679d32ac595de29d10c03efca6a25