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.
Metrics
No CVSS score has been published yet.
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 03149948832a078f759022ed5b92e722d8d23c26, < c6875423ad849ac234ab9812eb72f37ff8a490b4; >= 03149948832a078f759022ed5b92e722d8d23c26, < 220011fe95fc78b2bc2d7d43893bc73957a5c811; >= 03149948832a078f759022ed5b92e722d8d23c26, < 222b7005e4519f633b4cd666226256abbab46a1a; >= 03149948832a078f759022ed5b92e722d8d23c26, < c4a22154870813d10aa0b4c734a574c726f9d4b0; >= 03149948832a078f759022ed5b92e722d8d23c26, < bb45f705c4440dd3c689328319b88dd28770bbb8; >= 03149948832a078f759022ed5b92e722d8d23c26, < 0f63e656b1c679d32ac595de29d10c03efca6a25 |
| Linux | Linux | 5.19 |
References
- https://git.kernel.org/stable/c/0f63e656b1c679d32ac595de29d10c03efca6a25
- https://git.kernel.org/stable/c/220011fe95fc78b2bc2d7d43893bc73957a5c811
- https://git.kernel.org/stable/c/222b7005e4519f633b4cd666226256abbab46a1a
- https://git.kernel.org/stable/c/bb45f705c4440dd3c689328319b88dd28770bbb8
- https://git.kernel.org/stable/c/c4a22154870813d10aa0b4c734a574c726f9d4b0
- https://git.kernel.org/stable/c/c6875423ad849ac234ab9812eb72f37ff8a490b4
Timeline
- Published
- Sep 11, 2026
- Last modified
- Oct 19, 2026
- NVD status
- Received