vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2026-64291

iommufd: Set veventq_depth upper bound

MEDIUM
5.5
CVSS Score
Published: July 25, 2026 at 08:49 AM UTC
Updated: August 17, 2026 at 05:17 AM UTC
1 product affected across 1 vendorLinux Kernel

Using Linux by Linux?

Get instant alerts when new vulnerabilities affect Linux - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
MEDIUM5.5
Exploit prediction
EPSS 0.2%

Description

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).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
6.15 ≤ v < 6.18.396.15 ≤ v < 7.1.46.15 ≤ v < 7.26.19 ≤ v < 7.1.46.15e36ba5ab808ef6237c3148d469c8238674230e2b
Vendor states this is fixed in 6ebf2eb46fbd5b40393ff8fbb847ba96925beaff (fixed)
Vendor states this is fixed in e7b5e55652746b1221b9c10ff80eae8a154101ba (fixed)
Vendor states this is fixed in f565297edf316016be4a1a9e2eb9f39359313f43 (fixed)
Vendor states this is fixed in 6.15 (unaffected)
Vendor states this is fixed in 6.18.39 (unaffected)
Vendor states this is fixed in 7.1.4 (unaffected)
Vendor states this is fixed in 7.2 (unaffected)

References (3)

Patch
Source: cverecord
https://git.kernel.org/stable/c/f565297edf316016be4a1a9e2eb9f39359313f43
Patch
Source: cverecord
https://git.kernel.org/stable/c/e7b5e55652746b1221b9c10ff80eae8a154101ba
Patch
Source: cverecord
https://git.kernel.org/stable/c/6ebf2eb46fbd5b40393ff8fbb847ba96925beaff

CVSS

5.5MEDIUM[email protected]
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
NVD-CWE-noinfo

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card