Critical severity · published Sep 11, 2026
CVE-2026-89448
iommu/vt-d: Force requesting ACS when tboot is enabled
9.3
CVSS
0.1%
EPSS
No
On KEV
Description
In the Linux kernel, the following vulnerability has been resolved:
iommu/vt-d: Force requesting ACS when tboot is enabled
Currently the conditions of requesting ACS in detect_intel_iommu()
don't include tboot, leading to a possible misconfiguration with ACS
disabled (e.g. due to user opts) while iommu is later forced on by
tboot_force_iommu().
Fix it by checking tboot in detect_intel_iommu().
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
Linux · Linux
5d990b627537e59a3a2f039ff588a4750e9c1a6a before 579eb867d3da63f3b5e32f235925e1daa7ec70d0; 5d990b627537e59a3a2f039ff588a4750e9c1a6a before aaeb81241e802c86be69394f72d49fde3f861fbb; 5d990b627537e59a3a2f039ff588a4750e9c1a6a before 45705a6bfdb283f7b3b509010fd617b72f942537; 5d990b627537e59a3a2f039ff588a4750e9c1a6a before 87bc611c6c98a41c00feb7b06b0c297dd141a2ae; 5d990b627537e59a3a2f039ff588a4750e9c1a6a before 607432b2618b61df81134be0ef2562b8300c1216; 2.6.33 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-89448
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-89448
git.kernel.org
https://git.kernel.org/stable/c/45705a6bfdb283f7b3b509010fd617b72f942537
git.kernel.org
https://git.kernel.org/stable/c/579eb867d3da63f3b5e32f235925e1daa7ec70d0
git.kernel.org
https://git.kernel.org/stable/c/607432b2618b61df81134be0ef2562b8300c1216
git.kernel.org
https://git.kernel.org/stable/c/87bc611c6c98a41c00feb7b06b0c297dd141a2ae
git.kernel.org
https://git.kernel.org/stable/c/aaeb81241e802c86be69394f72d49fde3f861fbb
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