Medium 5.5Published Jul 25, 2026

CVE-2026-64291iommufd: Set veventq_depth upper bound

Updated under an hour ago (Oct 26, 2026, 1:40 PM ET)

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Exploited in the last 30 days

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).

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Aug 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from e36ba5ab808ef6237c3148d469c8238674230e2b before f565297edf316016be4a1a9e2eb9f39359313f43; from e36ba5ab808ef6237c3148d469c8238674230e2b before e7b5e55652746b1221b9c10ff80eae8a154101ba; from e36ba5ab808ef6237c3148d469c8238674230e2b before 6ebf2eb46fbd5b40393ff8fbb847ba96925beaff	CNA record
linux linux_kernel linux:linux_kernel	from 6.15 before 6.18.39; from 6.19 before 7.1.4	NVD

References

References

https://git.kernel.org/stable/c/f565297edf316016be4a1a9e2eb9f39359313f43	patch
https://git.kernel.org/stable/c/e7b5e55652746b1221b9c10ff80eae8a154101ba	patch
https://git.kernel.org/stable/c/6ebf2eb46fbd5b40393ff8fbb847ba96925beaff	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.