01 Record

CVE-2026-89751

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

UnratedPUBLISHEDCNA: Linux

CNA base scoreUnratedNo CNA CVSS vector

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02 Description

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

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: 0.17% probability of exploitation activity in the next 30 days.
EPSS percentile: Equal to or higher than the score of 6.6% of scored records. A rank, not a probability.
NVD base score: The NVD has published no score for this record
NVD CVSS vector: No NVD score to derive
NVD analysis status: Received. NVD last modified this record on 2026-10-19.
Red Hat severity: Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-09-11 19:46Z1 MO AGO

Last updated

2026-10-19 08:52Z10 DAYS AGO

Reserved

2026-09-11

Assigning CNA

Linux

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

CWE-193Off-by-one ErrorBase

Data version

5.2

Document digest

98f0e1d8afac01f3fcadb1b694c716bb5e8f67cf77c7a3a763aaf14e7a88035f

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux03149948832a078f759022ed5b92e722d8d23c26 to < c6875423ad849ac234ab9812eb72f37ff8a490b4, 03149948832a078f759022ed5b92e722d8d23c26 to < 220011fe95fc78b2bc2d7d43893bc73957a5c811, 03149948832a078f759022ed5b92e722d8d23c26 to < 222b7005e4519f633b4cd666226256abbab46a1a, 03149948832a078f759022ed5b92e722d8d23c26 to < c4a22154870813d10aa0b4c734a574c726f9d4b0, 03149948832a078f759022ed5b92e722d8d23c26 to < bb45f705c4440dd3c689328319b88dd28770bbb8, 03149948832a078f759022ed5b92e722d8d23c26 to < 0f63e656b1c679d32ac595de29d10c03efca6a25, 5.19—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/c6875423ad849ac234ab9812eb72f37ff8a490b4
git.kernel.orghttps://git.kernel.org/stable/c/220011fe95fc78b2bc2d7d43893bc73957a5c811
git.kernel.orghttps://git.kernel.org/stable/c/222b7005e4519f633b4cd666226256abbab46a1a
git.kernel.orghttps://git.kernel.org/stable/c/c4a22154870813d10aa0b4c734a574c726f9d4b0
git.kernel.orghttps://git.kernel.org/stable/c/bb45f705c4440dd3c689328319b88dd28770bbb8
git.kernel.orghttps://git.kernel.org/stable/c/0f63e656b1c679d32ac595de29d10c03efca6a25

07 Fixed in

Debian 12

linux
Fixed in 6.1.190-1
linux-6.12
Fixed in 6.12.111-1~deb12u1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

linux
Fixed in 6.12.111-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

linux
Fixed in 7.2.6-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.