What is CVE-2026-64291?

CVE-2026-64291 is a unscored severity Linux kernel vulnerability, affecting Linux kernel versions from 6.15 onward and patched in 6.18.39, 7.1.4 and 7.2-rc1. CVE-2026-64291 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-64291?

CVE-2026-64291 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2026-64291?

Yes, CVE-2026-64291 has been patched. Fixed versions include 6.18.39, 7.1.4 and 7.2-rc1. If you are running Linux kernel 6.15 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-64291 actively exploited?

CVE-2026-64291 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-64291

In the Linux kernel, the following vulnerability has been resolved: iommufd: Set veventq_depth upper bound iommufd_veventq_alloc() accepts any !0 veventq_depth from userspace, with an upper bound at U32_MAX. This leaves a vulnerability where userspace can allocate excessively large queues to exhaust kernel memory reserves. Cap the veventq_depth (maximum number of entries) to 1 << 19, matching the maximum number of entries in the SMMUv3 EVTQ (the largest use case today).

Package Linux Kernel

Published 2026-07-25

Last modified 2026-07-25

Patch available

Yes

Affected versions

Linux kernel versions 6.15 and later are affected. Fixed in 6.18.39, 7.1.4, 7.2-rc1 and their respective stable series.

Affected from

≥ 6.15

Fixed in

✓ 6.18.39 6.18.x ✓ 7.1.4 7.1.x ✓ 7.2-rc1

References

3 total

Frequently asked questions

What is CVE-2026-64291?

CVE-2026-64291 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.15 onward and has been patched in 6.18.39, 7.1.4 and 7.2-rc1. CVE-2026-64291 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2026-64291?

Yes. CVE-2026-64291 has been patched. Fixed versions include 6.18.39, 7.1.4 and 7.2-rc1. If you are running Linux kernel 6.15 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-64291 actively exploited?

No. CVE-2026-64291 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.