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Vulnerable Software

Vulnerability Details 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).

Exploit prediction scoring system (EPSS) score

EPSS Score 0.002

EPSS Ranking 9.8%

CVSS Severity

CVSS v3 Score 5.5

References

Products affected by CVE-2026-64291

Linux » Linux Kernel » Version: 6.15

cpe:2.3:o:linux:linux_kernel:6.15
Linux » Linux Kernel » Version: 6.15.1

cpe:2.3:o:linux:linux_kernel:6.15.1
Linux » Linux Kernel » Version: 6.15.10

cpe:2.3:o:linux:linux_kernel:6.15.10
Linux » Linux Kernel » Version: 6.15.11

cpe:2.3:o:linux:linux_kernel:6.15.11
Linux » Linux Kernel » Version: 6.15.2

cpe:2.3:o:linux:linux_kernel:6.15.2
Linux » Linux Kernel » Version: 6.15.3

cpe:2.3:o:linux:linux_kernel:6.15.3
Linux » Linux Kernel » Version: 6.15.4

cpe:2.3:o:linux:linux_kernel:6.15.4
Linux » Linux Kernel » Version: 6.15.5

cpe:2.3:o:linux:linux_kernel:6.15.5
Linux » Linux Kernel » Version: 6.15.6

cpe:2.3:o:linux:linux_kernel:6.15.6
Linux » Linux Kernel » Version: 6.15.7

cpe:2.3:o:linux:linux_kernel:6.15.7
Linux » Linux Kernel » Version: 6.15.8

cpe:2.3:o:linux:linux_kernel:6.15.8
Linux » Linux Kernel » Version: 6.15.9

cpe:2.3:o:linux:linux_kernel:6.15.9
Linux » Linux Kernel » Version: 6.16

cpe:2.3:o:linux:linux_kernel:6.16
Linux » Linux Kernel » Version: 6.16.1

cpe:2.3:o:linux:linux_kernel:6.16.1
Linux » Linux Kernel » Version: 6.16.10

cpe:2.3:o:linux:linux_kernel:6.16.10
Linux » Linux Kernel » Version: 6.16.11

cpe:2.3:o:linux:linux_kernel:6.16.11
Linux » Linux Kernel » Version: 6.16.12

cpe:2.3:o:linux:linux_kernel:6.16.12
Linux » Linux Kernel » Version: 6.16.2

cpe:2.3:o:linux:linux_kernel:6.16.2
Linux » Linux Kernel » Version: 6.16.3

cpe:2.3:o:linux:linux_kernel:6.16.3
Linux » Linux Kernel » Version: 6.16.4

cpe:2.3:o:linux:linux_kernel:6.16.4
Linux » Linux Kernel » Version: 6.16.5

cpe:2.3:o:linux:linux_kernel:6.16.5
Linux » Linux Kernel » Version: 6.16.6

cpe:2.3:o:linux:linux_kernel:6.16.6
Linux » Linux Kernel » Version: 6.16.7

cpe:2.3:o:linux:linux_kernel:6.16.7
Linux » Linux Kernel » Version: 6.16.8

cpe:2.3:o:linux:linux_kernel:6.16.8
Linux » Linux Kernel » Version: 6.16.9

cpe:2.3:o:linux:linux_kernel:6.16.9
Linux » Linux Kernel » Version: 6.17

cpe:2.3:o:linux:linux_kernel:6.17
Linux » Linux Kernel » Version: 6.17.1

cpe:2.3:o:linux:linux_kernel:6.17.1
Linux » Linux Kernel » Version: 6.17.10

cpe:2.3:o:linux:linux_kernel:6.17.10
Linux » Linux Kernel » Version: 6.17.11

cpe:2.3:o:linux:linux_kernel:6.17.11
Linux » Linux Kernel » Version: 6.17.12

cpe:2.3:o:linux:linux_kernel:6.17.12
Linux » Linux Kernel » Version: 6.17.13

cpe:2.3:o:linux:linux_kernel:6.17.13
Linux » Linux Kernel » Version: 6.17.2

cpe:2.3:o:linux:linux_kernel:6.17.2
Linux » Linux Kernel » Version: 6.17.3

cpe:2.3:o:linux:linux_kernel:6.17.3
Linux » Linux Kernel » Version: 6.17.4

cpe:2.3:o:linux:linux_kernel:6.17.4
Linux » Linux Kernel » Version: 6.17.5

cpe:2.3:o:linux:linux_kernel:6.17.5
Linux » Linux Kernel » Version: 6.17.6

cpe:2.3:o:linux:linux_kernel:6.17.6
Linux » Linux Kernel » Version: 6.17.7

cpe:2.3:o:linux:linux_kernel:6.17.7
Linux » Linux Kernel » Version: 6.17.8

cpe:2.3:o:linux:linux_kernel:6.17.8
Linux » Linux Kernel » Version: 6.17.9

cpe:2.3:o:linux:linux_kernel:6.17.9
Linux » Linux Kernel » Version: 6.18

cpe:2.3:o:linux:linux_kernel:6.18
Linux » Linux Kernel » Version: 6.18.1

cpe:2.3:o:linux:linux_kernel:6.18.1
Linux » Linux Kernel » Version: 6.18.10

cpe:2.3:o:linux:linux_kernel:6.18.10
Linux » Linux Kernel » Version: 6.18.11

cpe:2.3:o:linux:linux_kernel:6.18.11
Linux » Linux Kernel » Version: 6.18.13

cpe:2.3:o:linux:linux_kernel:6.18.13
Linux » Linux Kernel » Version: 6.18.14

cpe:2.3:o:linux:linux_kernel:6.18.14
Linux » Linux Kernel » Version: 6.18.16

cpe:2.3:o:linux:linux_kernel:6.18.16
Linux » Linux Kernel » Version: 6.18.17

cpe:2.3:o:linux:linux_kernel:6.18.17
Linux » Linux Kernel » Version: 6.18.18

cpe:2.3:o:linux:linux_kernel:6.18.18
Linux » Linux Kernel » Version: 6.18.19

cpe:2.3:o:linux:linux_kernel:6.18.19
Linux » Linux Kernel » Version: 6.18.2

cpe:2.3:o:linux:linux_kernel:6.18.2
Linux » Linux Kernel » Version: 6.18.20

cpe:2.3:o:linux:linux_kernel:6.18.20
Linux » Linux Kernel » Version: 6.18.21

cpe:2.3:o:linux:linux_kernel:6.18.21
Linux » Linux Kernel » Version: 6.18.22

cpe:2.3:o:linux:linux_kernel:6.18.22
Linux » Linux Kernel » Version: 6.18.23

cpe:2.3:o:linux:linux_kernel:6.18.23
Linux » Linux Kernel » Version: 6.18.24

cpe:2.3:o:linux:linux_kernel:6.18.24
Linux » Linux Kernel » Version: 6.18.25

cpe:2.3:o:linux:linux_kernel:6.18.25
Linux » Linux Kernel » Version: 6.18.26

cpe:2.3:o:linux:linux_kernel:6.18.26
Linux » Linux Kernel » Version: 6.18.27

cpe:2.3:o:linux:linux_kernel:6.18.27
Linux » Linux Kernel » Version: 6.18.28

cpe:2.3:o:linux:linux_kernel:6.18.28
Linux » Linux Kernel » Version: 6.18.29

cpe:2.3:o:linux:linux_kernel:6.18.29
Linux » Linux Kernel » Version: 6.18.3

cpe:2.3:o:linux:linux_kernel:6.18.3
Linux » Linux Kernel » Version: 6.18.30

cpe:2.3:o:linux:linux_kernel:6.18.30
Linux » Linux Kernel » Version: 6.18.31

cpe:2.3:o:linux:linux_kernel:6.18.31
Linux » Linux Kernel » Version: 6.18.32

cpe:2.3:o:linux:linux_kernel:6.18.32
Linux » Linux Kernel » Version: 6.18.33

cpe:2.3:o:linux:linux_kernel:6.18.33
Linux » Linux Kernel » Version: 6.18.34

cpe:2.3:o:linux:linux_kernel:6.18.34
Linux » Linux Kernel » Version: 6.18.35

cpe:2.3:o:linux:linux_kernel:6.18.35
Linux » Linux Kernel » Version: 6.18.36

cpe:2.3:o:linux:linux_kernel:6.18.36
Linux » Linux Kernel » Version: 6.18.37

cpe:2.3:o:linux:linux_kernel:6.18.37
Linux » Linux Kernel » Version: 6.18.4

cpe:2.3:o:linux:linux_kernel:6.18.4
Linux » Linux Kernel » Version: 6.18.5

cpe:2.3:o:linux:linux_kernel:6.18.5
Linux » Linux Kernel » Version: 6.18.6

cpe:2.3:o:linux:linux_kernel:6.18.6
Linux » Linux Kernel » Version: 6.18.7

cpe:2.3:o:linux:linux_kernel:6.18.7
Linux » Linux Kernel » Version: 6.18.8

cpe:2.3:o:linux:linux_kernel:6.18.8
Linux » Linux Kernel » Version: 6.18.9

cpe:2.3:o:linux:linux_kernel:6.18.9
Linux » Linux Kernel » Version: 6.19

cpe:2.3:o:linux:linux_kernel:6.19
Linux » Linux Kernel » Version: 6.19.1

cpe:2.3:o:linux:linux_kernel:6.19.1
Linux » Linux Kernel » Version: 6.19.10

cpe:2.3:o:linux:linux_kernel:6.19.10
Linux » Linux Kernel » Version: 6.19.11

cpe:2.3:o:linux:linux_kernel:6.19.11
Linux » Linux Kernel » Version: 6.19.12

cpe:2.3:o:linux:linux_kernel:6.19.12
Linux » Linux Kernel » Version: 6.19.13

cpe:2.3:o:linux:linux_kernel:6.19.13
Linux » Linux Kernel » Version: 6.19.14

cpe:2.3:o:linux:linux_kernel:6.19.14
Linux » Linux Kernel » Version: 6.19.3

cpe:2.3:o:linux:linux_kernel:6.19.3
Linux » Linux Kernel » Version: 6.19.4

cpe:2.3:o:linux:linux_kernel:6.19.4
Linux » Linux Kernel » Version: 6.19.6

cpe:2.3:o:linux:linux_kernel:6.19.6
Linux » Linux Kernel » Version: 6.19.7

cpe:2.3:o:linux:linux_kernel:6.19.7
Linux » Linux Kernel » Version: 6.19.8

cpe:2.3:o:linux:linux_kernel:6.19.8
Linux » Linux Kernel » Version: 6.19.9

cpe:2.3:o:linux:linux_kernel:6.19.9
Linux » Linux Kernel » Version: 7.0

cpe:2.3:o:linux:linux_kernel:7.0
Linux » Linux Kernel » Version: 7.0.1

cpe:2.3:o:linux:linux_kernel:7.0.1
Linux » Linux Kernel » Version: 7.0.10

cpe:2.3:o:linux:linux_kernel:7.0.10
Linux » Linux Kernel » Version: 7.0.11

cpe:2.3:o:linux:linux_kernel:7.0.11
Linux » Linux Kernel » Version: 7.0.12

cpe:2.3:o:linux:linux_kernel:7.0.12
Linux » Linux Kernel » Version: 7.0.13

cpe:2.3:o:linux:linux_kernel:7.0.13
Linux » Linux Kernel » Version: 7.0.14

cpe:2.3:o:linux:linux_kernel:7.0.14
Linux » Linux Kernel » Version: 7.0.2

cpe:2.3:o:linux:linux_kernel:7.0.2
Linux » Linux Kernel » Version: 7.0.3

cpe:2.3:o:linux:linux_kernel:7.0.3
Linux » Linux Kernel » Version: 7.0.4

cpe:2.3:o:linux:linux_kernel:7.0.4
Linux » Linux Kernel » Version: 7.0.5

cpe:2.3:o:linux:linux_kernel:7.0.5
Linux » Linux Kernel » Version: 7.0.6

cpe:2.3:o:linux:linux_kernel:7.0.6
Linux » Linux Kernel » Version: 7.0.7

cpe:2.3:o:linux:linux_kernel:7.0.7
Linux » Linux Kernel » Version: 7.0.8

cpe:2.3:o:linux:linux_kernel:7.0.8
Linux » Linux Kernel » Version: 7.0.9

cpe:2.3:o:linux:linux_kernel:7.0.9
Linux » Linux Kernel » Version: 7.1

cpe:2.3:o:linux:linux_kernel:7.1
Linux » Linux Kernel » Version: 7.1.1

cpe:2.3:o:linux:linux_kernel:7.1.1
Linux » Linux Kernel » Version: 7.1.2

cpe:2.3:o:linux:linux_kernel:7.1.2

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Vulnerable Software

Vulnerability Details CVE-2026-64291

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