UNKNOWN NVD
CVE-2026-89751
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
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.
References
- https://git.kernel.org/stable/c/0f63e656b1c679d32ac595de29d10c03efca6a25
- https://git.kernel.org/stable/c/222b7005e4519f633b4cd666226256abbab46a1a
- https://git.kernel.org/stable/c/bb45f705c4440dd3c689328319b88dd28770bbb8
- https://git.kernel.org/stable/c/c4a22154870813d10aa0b4c734a574c726f9d4b0
This unknown severity vulnerability was published on 2026-09-11 via NVD.
vulnfeed aggregates 13138 vulnerabilities from NVD, CISA KEV,
Ubuntu, Debian, Red Hat, Kubernetes, Exploit-DB, OSS-Security, GitHub and OpenStack — updated every 4 hours.