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5.5
MEDIUM CVSS 3.1
CVE-2026-64290
iommufd: Break the loop on failure in iommufd_fault_fops_read()
Overview
Description

In the Linux kernel, the following vulnerability has been resolved: iommufd: Break the loop on failure in iommufd_fault_fops_read() On a copy_to_user() failure inside the inner list_for_each_entry, only the inner loop breaks; the outer while re-fetches the just-restored fault group and retries the failing copy_to_user() forever, spinning the reader at 100% CPU with fault->mutex held. Check rc after the inner loop and break the outer while as well.

Details
INFO

Published Date :

July 25, 2026, 10:17 a.m.

Last Modified :

Aug. 17, 2026, 5:17 a.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-64290 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 MEDIUM [email protected]
Solution
Fix Linux kernel loop issue to prevent infinite spinning and 100% CPU usage.
  • Apply the patch to iommufd_fault_fops_read function.
  • Ensure proper error code checking after inner loops.
  • Break outer while loop on copy_to_user failure.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-64290.

URL Resource
https://git.kernel.org/stable/c/172fc8b19825a0f5884c38f2289188284e2d45ee Patch
https://git.kernel.org/stable/c/5539da127d03c1f6c2e2a49fdfbe331a0ccbdea8 Patch
https://git.kernel.org/stable/c/a38e0714affc5c0bbb40cba5a65d6d32a5e72a71 Patch
https://git.kernel.org/stable/c/f66c16b175509642ee7082df57c9bf3deaebae1a Patch
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-64290 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-64290 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-64290 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-64290 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 17, 2026

    Action Type Old Value New Value
    Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '07838f7fd529c8a6de44b601d4b7057e6c8d36ed', 'lessThan': 'a38e0714affc5c0bbb40cba5a65d6d32a5e72a71', 'versionType': 'git'}, {'status': 'affected', 'version': '07838f7fd529c8a6de44b601d4b7057e6c8d36ed', 'lessThan': '5539da127d03c1f6c2e2a49fdfbe331a0ccbdea8', 'versionType': 'git'}, {'status': 'affected', 'version': '07838f7fd529c8a6de44b601d4b7057e6c8d36ed', 'lessThan': 'f66c16b175509642ee7082df57c9bf3deaebae1a', 'versionType': 'git'}, {'status': 'affected', 'version': '07838f7fd529c8a6de44b601d4b7057e6c8d36ed', 'lessThan': '172fc8b19825a0f5884c38f2289188284e2d45ee', 'versionType': 'git'}], 'programFiles': ['drivers/iommu/iommufd/eventq.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.11'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.11', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/iommu/iommufd/eventq.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '07838f7fd529c8a6de44b601d4b7057e6c8d36ed', 'lessThan': 'a38e0714affc5c0bbb40cba5a65d6d32a5e72a71', 'versionType': 'git'}, {'status': 'affected', 'version': '07838f7fd529c8a6de44b601d4b7057e6c8d36ed', 'lessThan': '5539da127d03c1f6c2e2a49fdfbe331a0ccbdea8', 'versionType': 'git'}, {'status': 'affected', 'version': '07838f7fd529c8a6de44b601d4b7057e6c8d36ed', 'lessThan': 'f66c16b175509642ee7082df57c9bf3deaebae1a', 'versionType': 'git'}, {'status': 'affected', 'version': '07838f7fd529c8a6de44b601d4b7057e6c8d36ed', 'lessThan': '172fc8b19825a0f5884c38f2289188284e2d45ee', 'versionType': 'git'}], 'programFiles': ['drivers/iommu/iommufd/eventq.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.11'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.11', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/iommu/iommufd/eventq.c'], 'defaultStatus': 'affected'}]
  • Initial Analysis by [email protected]

    Aug. 12, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
    Added CWE CWE-835
    Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.39 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.1.4 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.11 up to (excluding) 6.12.101
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/172fc8b19825a0f5884c38f2289188284e2d45ee Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/5539da127d03c1f6c2e2a49fdfbe331a0ccbdea8 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/a38e0714affc5c0bbb40cba5a65d6d32a5e72a71 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/f66c16b175509642ee7082df57c9bf3deaebae1a Types: Patch
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 03, 2026

    Action Type Old Value New Value
    Added Reference https://git.kernel.org/stable/c/a38e0714affc5c0bbb40cba5a65d6d32a5e72a71
    Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '07838f7fd529c8a6de44b601d4b7057e6c8d36ed', 'lessThan': '5539da127d03c1f6c2e2a49fdfbe331a0ccbdea8', 'versionType': 'git'}, {'status': 'affected', 'version': '07838f7fd529c8a6de44b601d4b7057e6c8d36ed', 'lessThan': 'f66c16b175509642ee7082df57c9bf3deaebae1a', 'versionType': 'git'}, {'status': 'affected', 'version': '07838f7fd529c8a6de44b601d4b7057e6c8d36ed', 'lessThan': '172fc8b19825a0f5884c38f2289188284e2d45ee', 'versionType': 'git'}], 'programFiles': ['drivers/iommu/iommufd/eventq.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.11'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.11', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/iommu/iommufd/eventq.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '07838f7fd529c8a6de44b601d4b7057e6c8d36ed', 'lessThan': 'a38e0714affc5c0bbb40cba5a65d6d32a5e72a71', 'versionType': 'git'}, {'status': 'affected', 'version': '07838f7fd529c8a6de44b601d4b7057e6c8d36ed', 'lessThan': '5539da127d03c1f6c2e2a49fdfbe331a0ccbdea8', 'versionType': 'git'}, {'status': 'affected', 'version': '07838f7fd529c8a6de44b601d4b7057e6c8d36ed', 'lessThan': 'f66c16b175509642ee7082df57c9bf3deaebae1a', 'versionType': 'git'}, {'status': 'affected', 'version': '07838f7fd529c8a6de44b601d4b7057e6c8d36ed', 'lessThan': '172fc8b19825a0f5884c38f2289188284e2d45ee', 'versionType': 'git'}], 'programFiles': ['drivers/iommu/iommufd/eventq.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.11'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.11', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/iommu/iommufd/eventq.c'], 'defaultStatus': 'affected'}]
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jul. 25, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '07838f7fd529c8a6de44b601d4b7057e6c8d36ed', 'lessThan': '5539da127d03c1f6c2e2a49fdfbe331a0ccbdea8', 'versionType': 'git'}, {'status': 'affected', 'version': '07838f7fd529c8a6de44b601d4b7057e6c8d36ed', 'lessThan': 'f66c16b175509642ee7082df57c9bf3deaebae1a', 'versionType': 'git'}, {'status': 'affected', 'version': '07838f7fd529c8a6de44b601d4b7057e6c8d36ed', 'lessThan': '172fc8b19825a0f5884c38f2289188284e2d45ee', 'versionType': 'git'}], 'programFiles': ['drivers/iommu/iommufd/eventq.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.11'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.11', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/iommu/iommufd/eventq.c'], 'defaultStatus': 'affected'}]
    Added Description In the Linux kernel, the following vulnerability has been resolved: iommufd: Break the loop on failure in iommufd_fault_fops_read() On a copy_to_user() failure inside the inner list_for_each_entry, only the inner loop breaks; the outer while re-fetches the just-restored fault group and retries the failing copy_to_user() forever, spinning the reader at 100% CPU with fault->mutex held. Check rc after the inner loop and break the outer while as well.
    Added Reference https://git.kernel.org/stable/c/172fc8b19825a0f5884c38f2289188284e2d45ee
    Added Reference https://git.kernel.org/stable/c/5539da127d03c1f6c2e2a49fdfbe331a0ccbdea8
    Added Reference https://git.kernel.org/stable/c/f66c16b175509642ee7082df57c9bf3deaebae1a
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 5.5
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact