x86/tdx: Fix off-by-one in port I/O handling
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.
CVE-2026-89751
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-89751
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "03149948832a078f759022ed5b92e722d8d23c26",
"lessThan": "c6875423ad849ac234ab9812eb72f37ff8a490b4",
"versionType": "git"
},
{
"status": "affected",
"version": "03149948832a078f759022ed5b92e722d8d23c26",
"lessThan": "220011fe95fc78b2bc2d7d43893bc73957a5c811",
"versionType": "git"
},
{
"status": "affected",
"version": "03149948832a078f759022ed5b92e722d8d23c26",
"lessThan": "222b7005e4519f633b4cd666226256abbab46a1a",
"versionType": "git"
},
{
"status": "affected",
"version": "03149948832a078f759022ed5b92e722d8d23c26",
"lessThan": "c4a22154870813d10aa0b4c734a574c726f9d4b0",
"versionType": "git"
},
{
"status": "affected",
"version": "03149948832a078f759022ed5b92e722d8d23c26",
"lessThan": "bb45f705c4440dd3c689328319b88dd28770bbb8",
"versionType": "git"
},
{
"status": "affected",
"version": "03149948832a078f759022ed5b92e722d8d23c26",
"lessThan": "0f63e656b1c679d32ac595de29d10c03efca6a25",
"versionType": "git"
}
],
"programFiles": [
"arch/x86/coco/tdx/tdx.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.19"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.19",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/x86/coco/tdx/tdx.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89751
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #35225 · Revision 1
- Added to Heist Feed
- Publisher date