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).

CVSS v3 5.5 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/6ebf2eb46fbd5b40393ff8fbb847ba96925beaff	Patch
https://git.kernel.org/stable/c/e7b5e55652746b1221b9c10ff80eae8a154101ba	Patch
https://git.kernel.org/stable/c/f565297edf316016be4a1a9e2eb9f39359313f43	Patch

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:linux:linux_kernel::::::::
	cpe:2.3:o:linux:linux_kernel::::::::

History

12 Aug 2026, 15:06

Type	Values Removed	Values Added
References	~~() https://git.kernel.org/stable/c/6ebf2eb46fbd5b40393ff8fbb847ba96925beaff -~~	() https://git.kernel.org/stable/c/6ebf2eb46fbd5b40393ff8fbb847ba96925beaff - Patch
References	~~() https://git.kernel.org/stable/c/e7b5e55652746b1221b9c10ff80eae8a154101ba -~~	() https://git.kernel.org/stable/c/e7b5e55652746b1221b9c10ff80eae8a154101ba - Patch
References	~~() https://git.kernel.org/stable/c/f565297edf316016be4a1a9e2eb9f39359313f43 -~~	() https://git.kernel.org/stable/c/f565297edf316016be4a1a9e2eb9f39359313f43 - Patch
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 5.5
CWE		NVD-CWE-noinfo
First Time		Linux linux Kernel Linux
CPE		cpe:2.3:o:linux:linux_kernel::::::::

25 Jul 2026, 10:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-07-25 10:17

Updated : 2026-08-12 15:06

NVD link : CVE-2026-64291

Mitre link : CVE-2026-64291

CVE.ORG link : CVE-2026-64291

JSON object : View

Products Affected

linux

linux_kernel

CWE

NVD-CWE-noinfo

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