CVE-2026-89751
- Source
- https://cve.org/CVERecord?id=CVE-2026-89751
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89751.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-89751
- Downstream
- Published
- 2026-09-11T19:46:55Z
- Modified
- 2026-09-12T11:47:16Z
- Summary
- x86/tdx: Fix off-by-one in port I/O handling
- Details
-
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.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89751.json" }- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- 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
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89751.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-89751
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced03149948832a078f759022ed5b92e722d8d23c26Fixed222b7005e4519f633b4cd666226256abbab46a1aFixedc4a22154870813d10aa0b4c734a574c726f9d4b0Fixedbb45f705c4440dd3c689328319b88dd28770bbb8Fixed0f63e656b1c679d32ac595de29d10c03efca6a25