Dashboard / CVE-2026-64291

CVE-2026-64291

MEDIUM
MEDIUM Priority: 0.01 BB Relevance: 36/100
Published: 2026-07-25 Modified: 2026-11-06 First seen: 2026-11-06 Status: active

Attack Surface

Low Complexity No Interaction

CVSS Vector Breakdown

AV: Local
AC: Low
PR: Low
UI: None
S: Unchanged
C: None
I: None
A: High

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 Software (5)

VendorProductVersion
Linux Linux e36ba5ab808ef6237c3148d469c8238674230e2b < f565297edf316016be4a1a9e2eb9f39359313f43
Linux Linux e36ba5ab808ef6237c3148d469c8238674230e2b < e7b5e55652746b1221b9c10ff80eae8a154101ba
Linux Linux e36ba5ab808ef6237c3148d469c8238674230e2b < 6ebf2eb46fbd5b40393ff8fbb847ba96925beaff
Linux Linux 6.15
linux linux_kernel 6.15 – 6.18.39

References & Advisories (3)

Bug Bounty Relevance

36 / 100
✓ Low complexity
✓ No user interaction

CVSS Score

5.5 / 10.0 v3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploitation Probability

0.16%
Raw Score 0.001600
Percentile 5.2%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00160
2026-11-12
0.00160
2026-11-10
0.00160
2026-11-09
0.00160
2026-11-08
0.00160
2026-11-07
0.00160
2026-11-06
0.00160

Intelligence Sources

mitre ref →
nvd ref →

External Links