CVE-2026-45862 - Vulnerability Details

- iommu/vt-d: Flush cache for PASID table before using it

Description

In the Linux kernel, the following vulnerability has been resolved:

iommu/vt-d: Flush cache for PASID table before using it

When writing the address of a freshly allocated zero-initialized PASID
table to a PASID directory entry, do that after the CPU cache flush for
this PASID table, not before it, to avoid the time window when this
PASID table may be already used by non-coherent IOMMU hardware while
its contents in RAM is still some random old data, not zero-initialized.

Published: 2026-05-27

Score: 7.8 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Linux

unaffected

Version	Status	Constraints
`7e00b52c8cdd9d3a985d63d72ecae7bde6314883`	affected	< cd75e77125c8a51754ca4cd60b4ca083ed735d1d
`5c65f097124770c3e5b9b83ed1a8b68c119bc7b5`	affected	< 0616137b70e6d9a547d4b60df8e1b64e36d83661
`2bed9455db7cc0ab7ece6b3d846472097b52855a`	affected	< 36990407cdd257473607e33802d00e978af2759e
`194b3348bdbb7db65375c72f3f774aee4cc6614e`	affected	< c93f23375d8c410954b0df825e814b632fd62b9d
`194b3348bdbb7db65375c72f3f774aee4cc6614e`	affected	< 5962c30a6f05ea1ab73f039e235bb30716243517
`194b3348bdbb7db65375c72f3f774aee4cc6614e`	affected	< 36244dfd3853f7bf89d03b8e90d56b23ce7fbc16
`194b3348bdbb7db65375c72f3f774aee4cc6614e`	affected	< d15cda135148ea7ba929cfdbcf208182bc29a7aa
`194b3348bdbb7db65375c72f3f774aee4cc6614e`	affected	< 22d169bdd2849fe6bd18c2643742e1c02be6451c
`1b48c70feefc499b62670521efa002ab01e05df5`	affected	—
`bc348a6cc8f92e9979fbfbb3c6b48fd51b4b1dbf`	affected	—
`5.10.175`	affected	< 5.10.252
`5.15.103`	affected	< 5.15.202
`6.1.16`	affected	< 6.1.165
`5.4.237`	affected	< 5.5
`6.2.3`	affected	< 6.3

Linux

affected

Version	Status	Constraints
`6.3`	affected	—
`0`	unaffected	< 6.3
`5.10.252`	unaffected	≤ 5.10.*
`5.15.202`	unaffected	≤ 5.15.*
`6.1.165`	unaffected	≤ 6.1.*
`6.6.128`	unaffected	≤ 6.6.*
`6.12.75`	unaffected	≤ 6.12.*
`6.18.14`	unaffected	≤ 6.18.*
`6.19.4`	unaffected	≤ 6.19.*
`7.0`	unaffected	≤ *

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[7e00b52c8cdd9d3a985d63d72ecae7bde6314883,cd75e77125c8a51754ca4cd60b4ca083ed735d1d)`	affected	code_commit	—
`[5c65f097124770c3e5b9b83ed1a8b68c119bc7b5,0616137b70e6d9a547d4b60df8e1b64e36d83661)`	affected	code_commit	—
`[2bed9455db7cc0ab7ece6b3d846472097b52855a,36990407cdd257473607e33802d00e978af2759e)`	affected	code_commit	—
`[194b3348bdbb7db65375c72f3f774aee4cc6614e,c93f23375d8c410954b0df825e814b632fd62b9d)`	affected	code_commit	—
`[194b3348bdbb7db65375c72f3f774aee4cc6614e,5962c30a6f05ea1ab73f039e235bb30716243517)`	affected	code_commit	—
`[194b3348bdbb7db65375c72f3f774aee4cc6614e,36244dfd3853f7bf89d03b8e90d56b23ce7fbc16)`	affected	code_commit	—
`[194b3348bdbb7db65375c72f3f774aee4cc6614e,d15cda135148ea7ba929cfdbcf208182bc29a7aa)`	affected	code_commit	—
`[194b3348bdbb7db65375c72f3f774aee4cc6614e,22d169bdd2849fe6bd18c2643742e1c02be6451c)`	affected	code_commit	—
`1b48c70feefc499b62670521efa002ab01e05df5`	affected	code_commit	—
`bc348a6cc8f92e9979fbfbb3c6b48fd51b4b1dbf`	affected	code_commit	—
`[5.10.175,5.10.252)`	affected	semver	—
`[5.15.103,5.15.202)`	affected	semver	—
`[6.1.16,6.1.165)`	affected	semver	—
`[5.4.237,5.5)`	affected	semver	—
`[6.2.3,6.3)`	affected	semver	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`6.3`	affected	semver	—
`[0,6.3)`	unaffected	semver	—
`5.10.252, <= 5.10.*`	unaffected	generic	—
`5.15.202, <= 5.15.*`	unaffected	generic	—
`6.1.165, <= 6.1.*`	unaffected	generic	—
`6.6.128, <= 6.6.*`	unaffected	generic	—
`6.12.75, <= 6.12.*`	unaffected	generic	—
`6.18.14, <= 6.18.*`	unaffected	generic	—
`6.19.4, <= 6.19.*`	unaffected	generic	—
`7.0, <= *`	unaffected	generic	—

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Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

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Advisories

Source	ID	Title
Debian DLA	DLA-4606-1	linux security update

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00145.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/0616137b70e6d9a547d4b60df8e1b64e36d83661
https://git.kernel.org/stable/c/22d169bdd2849fe6bd18c2643742e1c02be6451c
https://git.kernel.org/stable/c/36244dfd3853f7bf89d03b8e90d56b23ce7fbc16
https://git.kernel.org/stable/c/36990407cdd257473607e33802d00e978af2759e
https://git.kernel.org/stable/c/5962c30a6f05ea1ab73f039e235bb30716243517
https://git.kernel.org/stable/c/c93f23375d8c410954b0df825e814b632fd62b9d
https://git.kernel.org/stable/c/cd75e77125c8a51754ca4cd60b4ca083ed735d1d
https://git.kernel.org/stable/c/d15cda135148ea7ba929cfdbcf208182bc29a7aa
https://lore.kernel.org/linux-cve-announce/2026052711-CVE-2026-45862-6bdd@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2026-45862
https://www.cve.org/CVERecord?id=CVE-2026-45862

History

Sat, 30 May 2026 11:00:00 +0000

Type	Values Removed	Values Added
Metrics	cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}`	cvssV3_1 `{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H'}`

Thu, 28 May 2026 14:30:00 +0000

Type	Values Removed	Values Added
Weaknesses	CWE-362

Thu, 28 May 2026 12:15:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-821
References		https://lore.kernel.org/linux-cve-announce/2026052711-CVE-2026-45862-6bdd@gregkh/T https://nvd.nist.gov/vuln/detail/CVE-2026-45862 https://www.cve.org/CVERecord?id=CVE-2026-45862
Metrics	threat_severity `None`	cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}` threat_severity `Moderate`

Wed, 27 May 2026 16:00:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-362

Wed, 27 May 2026 14:15:00 +0000

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Flush cache for PASID table before using it When writing the address of a freshly allocated zero-initialized PASID table to a PASID directory entry, do that after the CPU cache flush for this PASID table, not before it, to avoid the time window when this PASID table may be already used by non-coherent IOMMU hardware while its contents in RAM is still some random old data, not zero-initialized.
Title		iommu/vt-d: Flush cache for PASID table before using it
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/0616137b70e6d9a547d4b60df8e1b64e36d83661 https://git.kernel.org/stable/c/22d169bdd2849fe6bd18c2643742e1c02be6451c https://git.kernel.org/stable/c/36244dfd3853f7bf89d03b8e90d56b23ce7fbc16 https://git.kernel.org/stable/c/36990407cdd257473607e33802d00e978af2759e https://git.kernel.org/stable/c/5962c30a6f05ea1ab73f039e235bb30716243517 https://git.kernel.org/stable/c/c93f23375d8c410954b0df825e814b632fd62b9d https://git.kernel.org/stable/c/cd75e77125c8a51754ca4cd60b4ca083ed735d1d https://git.kernel.org/stable/c/d15cda135148ea7ba929cfdbcf208182bc29a7aa

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-05-27T12:15:41.903Z

Updated: 2026-05-30T10:45:42.298Z

Reserved: 2026-05-13T15:03:33.080Z

Link: CVE-2026-45862

Vulnrichment

No data.

NVD

Status : Awaiting Analysis

Published: 2026-05-27T14:16:58.430

Modified: 2026-06-17T10:52:37.630

Link: CVE-2026-45862

Redhat

Severity : Moderate

Publid Date: 2026-05-27T00:00:00Z

Links: CVE-2026-45862 - Bugzilla

OpenCVE Enrichment

Updated: 2026-05-30T12:30:23Z

Weaknesses

CWE-821

Tracking

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

Subscriptions

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