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).
| Source | ID | Title |
|---|---|---|
Ubuntu USN |
USN-8726-1 | Linux kernel vulnerabilities |
Ubuntu USN |
USN-8727-1 | Linux kernel (OEM) vulnerabilities |
Ubuntu USN |
USN-8728-1 | Linux kernel (GCP) vulnerabilities |
Ubuntu USN |
USN-8760-1 | Linux kernel (NVIDIA) vulnerabilities |
Ubuntu USN |
USN-8726-2 | Linux kernel (Raspberry Pi) vulnerabilities |
Ubuntu USN |
USN-8726-3 | Linux kernel (IBM) vulnerabilities |
Ubuntu USN |
USN-8800-1 | Linux kernel (NVIDIA BaseOS) vulnerabilities |
Ubuntu USN |
USN-8760-2 | Linux kernel (NVIDIA) vulnerabilities |
Ubuntu USN |
USN-8726-4 | Linux kernel vulnerabilities |
Ubuntu USN |
USN-8728-2 | Linux kernel (Azure) vulnerabilities |
Ubuntu USN |
USN-8728-3 | Linux kernel (Oracle) vulnerabilities |
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
Sat, 07 Nov 2026 07:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Wed, 12 Aug 2026 15:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | NVD-CWE-noinfo |
Thu, 30 Jul 2026 04:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-789 |
Thu, 30 Jul 2026 00:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-770 | |
| References |
| |
| Metrics |
threat_severity
|
cvssV3_1
|
Mon, 27 Jul 2026 06:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-789 |
Sat, 25 Jul 2026 09:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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). | |
| Title | iommufd: Set veventq_depth upper bound | |
| First Time appeared |
Linux
Linux linux Kernel |
|
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Linux
Linux linux Kernel |
|
| References |
|
Projects
Sign in to view the affected projects.
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-11-06T16:34:32.911Z
Reserved: 2026-07-19T15:36:31.778Z
Link: CVE-2026-64291
Updated: 2026-11-06T16:34:04.796Z
Status : Analyzed
Published: 2026-07-25T10:17:09.837
Modified: 2026-11-06T17:18:45.850
Link: CVE-2026-64291
OpenCVE Enrichment
Updated: 2026-08-13T11:00:12Z
Ubuntu USN