CVE-2026-86566

Dpdk: dpdk: guest with runt rx descriptors underflows copy length in vhost enqueue (split and packed rings)

6.5 MediumFix available

A flaw was found in DPDK lib/vhost. A guest with runt RX descriptors can underflow the copy length in vhost enqueue, causing a denial of service in a shared vhost backend such as OVS-DPDK.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.17%Unchanged since Oct 15, 2026

What each source reports

CVE List Score used 6.5

Dpdk: dpdk: guest with runt rx descriptors underflows copy length in vhost enqueue (split and packed rings)

A flaw was found in DPDK lib/vhost. A guest with runt RX descriptors can underflow the copy length in vhost enqueue, causing a denial of service in a shared vhost backend such as OVS-DPDK.

Record: CVE-2026-86566
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Weakness: CWE-191
Updated: 2026-11-06

EUVDEUVD-2026-101508 6.5

A flaw was found in DPDK lib/vhost. A guest with runt RX descriptors can underflow the copy length in vhost enqueue, causing a denial of service in a shared vhost backend such as OVS-DPDK.

Record: EUVD-2026-101508
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Updated: 2026-11-06

GitHub AdvisoriesGHSA-qff6-4mmg-g5c9 6.5

A flaw was found in DPDK lib/vhost. A guest with runt RX descriptors can underflow the copy...

A flaw was found in DPDK lib/vhost. A guest with runt RX descriptors can underflow the copy length in vhost enqueue, causing a denial of service in a shared vhost backend such as OVS-DPDK.

Record: GHSA-qff6-4mmg-g5c9
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Weakness: CWE-191
Updated: 2026-11-03

NVD 6.5

A flaw was found in DPDK lib/vhost. A guest with runt RX descriptors can underflow the copy length in vhost enqueue, causing a denial of service in a shared vhost backend such as OVS-DPDK.

Record: CVE-2026-86566
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Weakness: CWE-191
Updated: 2026-11-06

OSVDEBIAN-CVE-2026-86566 6.5

A flaw was found in DPDK lib/vhost. A guest with runt RX descriptors can underflow the copy length in vhost enqueue, causing a denial of service in a shared vhost backend such as OVS-DPDK.

Record: DEBIAN-CVE-2026-86566
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Updated: 2026-11-04

OSVRLSA-2026:94629 8.8

Important: dpdk security update

The dpdk packages provide the Data Plane Development Kit, which is a set of libraries and drivers for fast packet processing in the user space.

Security Fix(es):

dpdk: dpdk: Missing memory size validation before mmap in vhost memory region setup (CVE-2026-86561)
dpdk: dpdk: Control-queue descriptor double-fetch overflows host heap in DPDK vhost (VDUSE) (CVE-2026-86562)
dpdk: dpdk: Double offset bug in vhost log mapping calculation (CVE-2026-86563)
dpdk: dpdk: Guest can desynchronize virtqueue size from inflight descriptor table size, causing out-of-bounds write (CVE-2026-86565)
dpdk: dpdk: Guest with runt RX descriptors underflows copy length in vhost enqueue (split and packed rings) (CVE-2026-86566)
dpdk: dpdk: VDUSE handler fails to invalidate vring pointers when IOTLB is invalidated, leading to use-after-unmap (CVE-2026-86567)
dpdk: dpdk: Guest-triggered use-after-free and type confusion in vhost-crypto session cleanup (CVE-2026-86845)
dpdk: dpdk: Guest can trigger out-of-bounds write by controlling avail ring index in vhost-crypto (CVE-2026-86846)
dpdk: dpdk: Guest can trigger infinite loop in vhost-crypto writeback chain cleanup (CVE-2026-86847)
dpdk: dpdk: Time-of-check/time-of-use vulnerability allowing guest-triggered out-of-bounds write in vhost-crypto (CVE-2026-86848)
dpdk: dpdk: Integer overflow combined with missing validation leads to host buffer overflow in vhost-crypto (CVE-2026-86849)
dpdk: dpdk: Stack and heap buffer overflow in nfp vDPA driver (CVE-2026-86856)
dpdk: dpdk: Guest-triggered out-of-bounds walk via vhost indirect descriptor length TOCTOU (CVE-2026-93683)
dpdk: dpdk: heap out-of-bounds read/write in GSO header copy (CVE-2026-100236)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record: RLSA-2026:94629
CVSS 3.1: 8.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Updated: 2026-11-04

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OSVRLSA-2026:94630 8.8

Important: dpdk security update

The dpdk packages provide the Data Plane Development Kit, which is a set of libraries and drivers for fast packet processing in the user space.

Security Fix(es):

dpdk: dpdk: Missing memory size validation before mmap in vhost memory region setup (CVE-2026-86561)
dpdk: dpdk: Control-queue descriptor double-fetch overflows host heap in DPDK vhost (VDUSE) (CVE-2026-86562)
dpdk: dpdk: Double offset bug in vhost log mapping calculation (CVE-2026-86563)
dpdk: dpdk: Guest can desynchronize virtqueue size from inflight descriptor table size, causing out-of-bounds write (CVE-2026-86565)
dpdk: dpdk: Guest with runt RX descriptors underflows copy length in vhost enqueue (split and packed rings) (CVE-2026-86566)
dpdk: dpdk: VDUSE handler fails to invalidate vring pointers when IOTLB is invalidated, leading to use-after-unmap (CVE-2026-86567)
dpdk: dpdk: Guest-triggered use-after-free and type confusion in vhost-crypto session cleanup (CVE-2026-86845)
dpdk: dpdk: Guest can trigger out-of-bounds write by controlling avail ring index in vhost-crypto (CVE-2026-86846)
dpdk: dpdk: Guest can trigger infinite loop in vhost-crypto writeback chain cleanup (CVE-2026-86847)
dpdk: dpdk: Time-of-check/time-of-use vulnerability allowing guest-triggered out-of-bounds write in vhost-crypto (CVE-2026-86848)
dpdk: dpdk: Integer overflow combined with missing validation leads to host buffer overflow in vhost-crypto (CVE-2026-86849)
dpdk: dpdk: Stack and heap buffer overflow in nfp vDPA driver (CVE-2026-86856)
dpdk: dpdk: Guest-triggered out-of-bounds walk via vhost indirect descriptor length TOCTOU (CVE-2026-93683)
dpdk: dpdk: heap out-of-bounds read/write in GSO header copy (CVE-2026-100236)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record: RLSA-2026:94630
CVSS 3.1: 8.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Updated: 2026-11-04

OSVUBUNTU-CVE-2026-86566 6.5

A flaw was found in DPDK lib/vhost. A guest with runt RX descriptors can underflow the copy length in vhost enqueue, causing a denial of service in a shared vhost backend such as OVS-DPDK.

Record: UBUNTU-CVE-2026-86566
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Updated: 2026-11-02

OSVALSA-2026:94629 No score

Important: dpdk security update

The dpdk packages provide the Data Plane Development Kit, which is a set of libraries and drivers for fast packet processing in the user space.

Security Fix(es):

dpdk: dpdk: Missing memory size validation before mmap in vhost memory region setup (CVE-2026-86561)
dpdk: dpdk: Control-queue descriptor double-fetch overflows host heap in DPDK vhost (VDUSE) (CVE-2026-86562)
dpdk: dpdk: Double offset bug in vhost log mapping calculation (CVE-2026-86563)
dpdk: dpdk: Guest can desynchronize virtqueue size from inflight descriptor table size, causing out-of-bounds write (CVE-2026-86565)
dpdk: dpdk: Guest with runt RX descriptors underflows copy length in vhost enqueue (split and packed rings) (CVE-2026-86566)
dpdk: dpdk: VDUSE handler fails to invalidate vring pointers when IOTLB is invalidated, leading to use-after-unmap (CVE-2026-86567)
dpdk: dpdk: Guest-triggered use-after-free and type confusion in vhost-crypto session cleanup (CVE-2026-86845)
dpdk: dpdk: Guest can trigger out-of-bounds write by controlling avail ring index in vhost-crypto (CVE-2026-86846)
dpdk: dpdk: Guest can trigger infinite loop in vhost-crypto writeback chain cleanup (CVE-2026-86847)
dpdk: dpdk: Time-of-check/time-of-use vulnerability allowing guest-triggered out-of-bounds write in vhost-crypto (CVE-2026-86848)
dpdk: dpdk: Integer overflow combined with missing validation leads to host buffer overflow in vhost-crypto (CVE-2026-86849)
dpdk: dpdk: Stack and heap buffer overflow in nfp vDPA driver (CVE-2026-86856)
dpdk: dpdk: Guest-triggered out-of-bounds walk via vhost indirect descriptor length TOCTOU (CVE-2026-93683)
dpdk: dpdk: heap out-of-bounds read/write in GSO header copy (CVE-2026-100236)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record: ALSA-2026:94629
Updated: 2026-11-05

OSVALSA-2026:94630 No score

Important: dpdk security update

The dpdk packages provide the Data Plane Development Kit, which is a set of libraries and drivers for fast packet processing in the user space.

Security Fix(es):

dpdk: dpdk: Missing memory size validation before mmap in vhost memory region setup (CVE-2026-86561)
dpdk: dpdk: Control-queue descriptor double-fetch overflows host heap in DPDK vhost (VDUSE) (CVE-2026-86562)
dpdk: dpdk: Double offset bug in vhost log mapping calculation (CVE-2026-86563)
dpdk: dpdk: Guest can desynchronize virtqueue size from inflight descriptor table size, causing out-of-bounds write (CVE-2026-86565)
dpdk: dpdk: Guest with runt RX descriptors underflows copy length in vhost enqueue (split and packed rings) (CVE-2026-86566)
dpdk: dpdk: VDUSE handler fails to invalidate vring pointers when IOTLB is invalidated, leading to use-after-unmap (CVE-2026-86567)
dpdk: dpdk: Guest-triggered use-after-free and type confusion in vhost-crypto session cleanup (CVE-2026-86845)
dpdk: dpdk: Guest can trigger out-of-bounds write by controlling avail ring index in vhost-crypto (CVE-2026-86846)
dpdk: dpdk: Guest can trigger infinite loop in vhost-crypto writeback chain cleanup (CVE-2026-86847)
dpdk: dpdk: Time-of-check/time-of-use vulnerability allowing guest-triggered out-of-bounds write in vhost-crypto (CVE-2026-86848)
dpdk: dpdk: Integer overflow combined with missing validation leads to host buffer overflow in vhost-crypto (CVE-2026-86849)
dpdk: dpdk: Stack and heap buffer overflow in nfp vDPA driver (CVE-2026-86856)
dpdk: dpdk: Guest-triggered out-of-bounds walk via vhost indirect descriptor length TOCTOU (CVE-2026-93683)
dpdk: dpdk: heap out-of-bounds read/write in GSO header copy (CVE-2026-100236)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record: ALSA-2026:94630
Updated: 2026-11-04

OSVopenSUSE-SU-2026:12151-1 No score

dpdk-25.11.4-1.1 on GA media

These are all security issues fixed in the dpdk-25.11.4-1.1 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2026:12151-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`dpdk` AlmaLinux:9 From an advisory covering 14 CVEs	before 2:25.11-2.el9_8	2:25.11-2.el9_8
`dpdk-devel` AlmaLinux:9 From an advisory covering 14 CVEs	before 2:25.11-2.el9_8	2:25.11-2.el9_8
`dpdk-doc` AlmaLinux:9 From an advisory covering 14 CVEs	before 2:25.11-2.el9_8	2:25.11-2.el9_8
`dpdk-tools` AlmaLinux:9 From an advisory covering 14 CVEs	before 2:25.11-2.el9_8	2:25.11-2.el9_8
`dpdk` AlmaLinux:10 From an advisory covering 14 CVEs	before 2:25.11-2.el10_2	2:25.11-2.el10_2
`dpdk-devel` AlmaLinux:10 From an advisory covering 14 CVEs	before 2:25.11-2.el10_2	2:25.11-2.el10_2
`dpdk-doc` AlmaLinux:10 From an advisory covering 14 CVEs	before 2:25.11-2.el10_2	2:25.11-2.el10_2
`dpdk-tools` AlmaLinux:10 From an advisory covering 14 CVEs	before 2:25.11-2.el10_2	2:25.11-2.el10_2
`dpdk` Debian:12	All versions, plus listed versions 22.11.1-222.11.11-0+deb12u122.11.2-122.11.2-222.11.2-2~deb12u1 Show 39 moreShow less 22.11.2-322.11.3-122.11.3-1~deb12u122.11.3-222.11.4-1~deb12u122.11.5-1~deb12u122.11.6-1~deb12u122.11.7-1~deb12u122.11.8-1~deb12u122.11.9-1~deb12u123.11-123.11-1~exp123.11.1-123.11.1-223.11.2-123.11.2-1+exp123.11.2-1+exp223.11.2-1+exp323.11.2-1+exp423.11.2-223.11.2-324.11-124.11-224.11.1-124.11.2-124.11.2-224.11.3-124.11.3-1~deb13u124.11.3-224.11~rc2-124.11~rc2-224.11~rc3-124.11~rc4-125.11-125.11-225.11.1-125.11.2-125.11.3-125.11.4-1	None known
`dpdk` Debian:13	before 24.11.8-0+deb13u1, plus listed versions 24.11.2-224.11.3-124.11.3-1~deb13u124.11.3-224.11.4-0+deb13u1	24.11.8-0+deb13u1

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Affected packages
Package	Affected	Fixed
`dpdk` Debian:14	before 25.11.4-1, plus listed versions 24.11.2-224.11.3-124.11.3-1~deb13u124.11.3-225.11-1 Show 4 moreShow less 25.11-225.11.1-125.11.2-125.11.3-1	25.11.4-1
`dpdk` Rocky Linux:9 From an advisory covering 14 CVEs	before 2:25.11-2.el9_8	2:25.11-2.el9_8
`dpdk` Rocky Linux:10 From an advisory covering 14 CVEs	before 2:25.11-2.el10_2	2:25.11-2.el10_2
`dpdk` Ubuntu:16.04:LTS	All versions, plus listed versions 2.0.0-0ubuntu12.0.0-0ubuntu22.0.0-0ubuntu32.2.0-0ubuntu12.2.0-0ubuntu3 Show 4 moreShow less 2.2.0-0ubuntu52.2.0-0ubuntu62.2.0-0ubuntu72.2.0-0ubuntu8	None known
`dpdk` Ubuntu:18.04:LTS	All versions, plus listed versions 17.05.2-0ubuntu117.05.2-0ubuntu217.11-317.11-417.11-5 Show 10 moreShow less 17.11.1-617.11.2-1ubuntu0.117.11.3-3~ubuntu0.18.0417.11.5-0~ubuntu18.04.117.11.6-0~ubuntu18.04.117.11.8-0~ubuntu18.04.217.11.9-0ubuntu18.04.117.11.9-0ubuntu18.04.217.11.10-0ubuntu0.117.11.10-0ubuntu0.2	None known
`dpdk` Ubuntu:20.04:LTS	All versions, plus listed versions 18.11.2-418.11.3-118.11.4-118.11.4-1ubuntu118.11.5-1 Show 13 moreShow less 19.11-2ubuntu119.11-2ubuntu219.11.1-0ubuntu119.11.1-0ubuntu1.119.11.3-0ubuntu0.119.11.3-0ubuntu0.219.11.6-0ubuntu0.20.04.119.11.7-0ubuntu0.20.04.119.11.7-0ubuntu0.20.04.219.11.10-0ubuntu0.20.04.119.11.12-0ubuntu0.20.04.119.11.13-0ubuntu0.20.04.119.11.14-0ubuntu0.20.04.1	None known
`dpdk` Ubuntu:22.04:LTS	All versions, plus listed versions 20.11.3-0ubuntu120.11.3-0ubuntu321.11-121.11-1build121.11.1-0ubuntu0.3 Show 7 moreShow less 21.11.2-0ubuntu0.22.04.121.11.3-0ubuntu0.22.04.121.11.4-0ubuntu0.22.04.121.11.6-0ubuntu0.22.04.121.11.6-0ubuntu0.22.04.221.11.9-0ubuntu0.22.04.121.11.9-0ubuntu0.22.04.2	None known
`dpdk` Ubuntu:24.04:LTS	All versions, plus listed versions 22.11.3-122.11.3-223.11-123.11-1build223.11-1build3 Show 4 moreShow less 23.11-1ubuntu0.123.11.4-0ubuntu0.24.04.123.11.4-0ubuntu0.24.04.223.11.7-0ubuntu0.24.04.1	None known
`dpdk` Ubuntu:26.10	All versions, plus listed versions 25.11-225.11.2-125.11.2-1build125.11.3-1	None known
`dpdk` Ubuntu:26.04:LTS	All versions, plus listed versions 24.11.3-124.11.3-225.11-225.11.3-0ubuntu0.26.04.1	None known
`dpdk` openSUSE:Tumbleweed From an advisory covering 14 CVEs	before 25.11.4-1.1	25.11.4-1.1

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected	CVE List, EUVD, NVD
Nov 5, 2026	affected, aliases, references	OSV
Nov 4, 2026	affected, aliases, references	OSV
Nov 4, 2026	affected, aliases, references	GitHub Advisories, NVD, OSV
Nov 3, 2026	references	CVE List
Nov 3, 2026	facts, references	EUVD
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-86566 is a medium vulnerability (CVSS 6.5) in Red Hat Fast Datapath For Rhel 10, published October 14, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.17%, the 6th percentile. Fixed in dpdk 24.11.8-0+deb13u1.

References

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