CVE-2026-89751

CVE-2026-89751: vulnerability in Linux

x86/tdx: Fix off-by-one in port I/O handling

Published · Updated

3Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackepss 0.2%
exploitation probability
0.2%top 94% of all CVEs
observed exploitation
nono source reports it
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.
Affected products
Linux · Linux
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References
https://git.kernel.org/stable/c/0f63e656b1c679d32ac595de29d10c03efca6a25https://git.kernel.org/stable/c/220011fe95fc78b2bc2d7d43893bc73957a5c811https://git.kernel.org/stable/c/222b7005e4519f633b4cd666226256abbab46a1ahttps://git.kernel.org/stable/c/bb45f705c4440dd3c689328319b88dd28770bbb8https://git.kernel.org/stable/c/c4a22154870813d10aa0b4c734a574c726f9d4b0https://git.kernel.org/stable/c/c6875423ad849ac234ab9812eb72f37ff8a490b4