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VulnerabilityPublished Updated

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

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f66c16b175509642ee7082df57c9bf3deaebae1a : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:51 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none
CISA SSVC
Exploitation
No evidence of active exploitation and no public proof of concept
Automatable
Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact
Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch
Available – fixed in f66c16b175509642ee7082df57c9bf3deaebae1a, a38e0714affc5c0bbb40cba5a65d6d32a5e72a71, 5539da127d03c1f6c2e2a49fdfbe331a0ccbdea8 +1

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 25 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

What to do

Upgrade Linux kernel to f66c16b175509642ee7082df57c9bf3deaebae1a, a38e0714affc5c0bbb40cba5a65d6d32a5e72a71, 5539da127d03c1f6c2e2a49fdfbe331a0ccbdea8 or 172fc8b19825a0f5884c38f2289188284e2d45ee.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 07838f7fd529c8a6de44b601d4b7057e6c8d36ed, < f66c16b175509642ee7082df57c9bf3deaebae1a
Fixed in
  • f66c16b175509642ee7082df57c9bf3deaebae1a
LinuxLinuxAffected
  • ≥ 07838f7fd529c8a6de44b601d4b7057e6c8d36ed, < a38e0714affc5c0bbb40cba5a65d6d32a5e72a71
Fixed in
  • a38e0714affc5c0bbb40cba5a65d6d32a5e72a71
LinuxLinuxAffected
  • ≥ 07838f7fd529c8a6de44b601d4b7057e6c8d36ed, < 5539da127d03c1f6c2e2a49fdfbe331a0ccbdea8
Fixed in
  • 5539da127d03c1f6c2e2a49fdfbe331a0ccbdea8
LinuxLinuxAffected
  • ≥ 07838f7fd529c8a6de44b601d4b7057e6c8d36ed, < 172fc8b19825a0f5884c38f2289188284e2d45ee
Fixed in
  • 172fc8b19825a0f5884c38f2289188284e2d45ee
LinuxLinuxAffected
  • =6.11
Fixed in–

AI-suggested

A fix is available in the Linux kernel versions identified by the fixed commit hashes. Users should update to a kernel version that includes these fixes to resolve the issue.

Description

A vulnerability in the Linux kernel's iommufd component caused an infinite retry loop on copy_to_user() failures in the iommufd_fault_fops_read() function. This loop spun the CPU at 100% while holding a mutex, potentially causing a denial of service. The issue was fixed by breaking the outer loop on failure to prevent indefinite retries.

References

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