Linux Kernel up to 6.18.38/7.1.3 iommufd iommufd_veventq_alloc veventq_depth allocation of resources

CVSS Meta Temp Score
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4.2$0-$5k1.56-

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.18.38/7.1.3. It has been declared as problematic. This affects the function iommufd_veventq_alloc of the component iommufd. The manipulation of the argument veventq_depth results in allocation of resources. This vulnerability was named CVE-2026-64291. The attack needs to be approached locally. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 6.18.38/7.1.3. Affected is the function iommufd_veventq_alloc of the component iommufd. The manipulation of the argument veventq_depth with an unknown input leads to a allocation of resources vulnerability. CWE is classifying the issue as CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. This is going to have an impact on integrity, and availability. CVE summarizes:

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).

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2026-64291 since 07/19/2026. The exploitability is told to be easy. The attack needs to be approached locally. There are known technical details, but no exploit is available.

Upgrading to version 6.18.39, 7.1.4 or 7.2-rc1 eliminates this vulnerability. Applying the patch f565297edf316016be4a1a9e2eb9f39359313f43/e7b5e55652746b1221b9c10ff80eae8a154101ba/6ebf2eb46fbd5b40393ff8fbb847ba96925beaff is able to eliminate this problem.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.2

VulDB Base Score: 4.4
VulDB Temp Score: 4.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Allocation of resources
CWE: CWE-770 / CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.39/7.1.4/7.2-rc1
Patch: f565297edf316016be4a1a9e2eb9f39359313f43/e7b5e55652746b1221b9c10ff80eae8a154101ba/6ebf2eb46fbd5b40393ff8fbb847ba96925beaff

Timelineinfo

07/19/2026 CVE reserved
07/25/2026 +6 days Advisory disclosed
07/25/2026 +0 days VulDB entry created
07/25/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-64291 (🔒)
GCVE (CVE): GCVE-0-2026-64291
GCVE (VulDB): GCVE-100-383088

Entryinfo

Created: 07/25/2026 13:47
Changes: 07/25/2026 13:47 (60)
Complete: 🔍
Cache ID: 216::103

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