Paper/Archive/CVE-2026-89448

CVE-2026-89448

Linux Linux — iommu/vt-d: Force requesting ACS when tboot is enabled

CVSS 9.3 (CNA)9.3 / 10 × 3027.9 Not in CISA KEV+300.0 EPSS percentile 3.5.035 × 200.7 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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().

Affected

ProductAffectedFixed inSource

Linux5d990b627537e59a3a2f039ff588a4750e9c1a6a – < 579eb867d3da63f3b5e32f235925e1daa7ec70d0579eb867d3da63f3b5e32f235925e1daa7ec70d0CNA

Linux5d990b627537e59a3a2f039ff588a4750e9c1a6a – < aaeb81241e802c86be69394f72d49fde3f861fbbaaeb81241e802c86be69394f72d49fde3f861fbbCNA

Linux5d990b627537e59a3a2f039ff588a4750e9c1a6a – < 45705a6bfdb283f7b3b509010fd617b72f94253745705a6bfdb283f7b3b509010fd617b72f942537CNA

Linux5d990b627537e59a3a2f039ff588a4750e9c1a6a – < 87bc611c6c98a41c00feb7b06b0c297dd141a2ae87bc611c6c98a41c00feb7b06b0c297dd141a2aeCNA

Linux5d990b627537e59a3a2f039ff588a4750e9c1a6a – < 607432b2618b61df81134be0ef2562b8300c1216607432b2618b61df81134be0ef2562b8300c1216CNA

Linux2.6.33–CNA

Scores by source

Linux (CNA)9.3CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgit.kernel.org/stable/c/579eb867d3da63f3b5e32f235925e1daa7ec70d0 refgit.kernel.org/stable/c/aaeb81241e802c86be69394f72d49fde3f861fbb refgit.kernel.org/stable/c/45705a6bfdb283f7b3b509010fd617b72f942537 refgit.kernel.org/stable/c/87bc611c6c98a41c00feb7b06b0c297dd141a2ae refgit.kernel.org/stable/c/607432b2618b61df81134be0ef2562b8300c1216