What’s Vulnerable › Vulnerabilities

CVE-2026-64290: iommufd: Break the loop on failure in iommufd_fault_fops_read()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-25 · updated 2026-08-17
• Weakness: CWE-835

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.

Affected products

• Linux kernel: from 6.11 before 6.12.101; from 6.13 before 6.18.39; from 6.19 before 7.1.4 — fixed in 6.12.101, 6.18.39, 7.1.4

How to fix

Upgrade to a fixed version: Linux kernel 6.12.101, 6.18.39, 7.1.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/172fc8b19825a0f5884c38f2289188284e2d45ee
• https://git.kernel.org/stable/c/5539da127d03c1f6c2e2a49fdfbe331a0ccbdea8
• https://git.kernel.org/stable/c/a38e0714affc5c0bbb40cba5a65d6d32a5e72a71
• https://git.kernel.org/stable/c/f66c16b175509642ee7082df57c9bf3deaebae1a

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