CVE-2026-64290

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux07838f7fd529c8a6de44b601d4b7057e6c8d36ed < 5539da127d03c1f6c2e2a49fdfbe331a0ccbdea8affected
LinuxLinux07838f7fd529c8a6de44b601d4b7057e6c8d36ed < f66c16b175509642ee7082df57c9bf3deaebae1aaffected
LinuxLinux07838f7fd529c8a6de44b601d4b7057e6c8d36ed < 172fc8b19825a0f5884c38f2289188284e2d45eeaffected
LinuxLinux6.11affected
LinuxLinux0 < 6.11unaffected
LinuxLinux6.18.39 <= 6.18.*unaffected
LinuxLinux7.1.4 <= 7.1.*unaffected
LinuxLinux7.2-rc1 <= *unaffected

Weaknesses

References