CVE-2026-46322

Host service interruption via TUN page leak

Published Jun 9, 2026 · Updated Jun 9, 2026

Memory leak in the Linux Kernel TUN driver allows guest OS users or local users to interrupt host services through memory exhaustion. The tun_xdp_one() failure path returns after build_skb() fails without releasing the page allocated by vhost_net_build_xdp(), while tun_sendmsg() reports success and prevents vhost_tx_batch() cleanup. Repeated batched virtio-net transmissions under sk_buff memory pressure leak page fragments until host memory availability degrades.

CVSS severity7.1
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in the Linux Kernel TUN driver allows guest OS users or local users to interrupt host services through memory exhaustion. The tun_xdp_one() failure path returns after build_skb() fails without releasing the page allocated by vhost_net_build_xdp(), while tun_sendmsg() reports success and prevents vhost_tx_batch() cleanup. Repeated batched virtio-net transmissions under sk_buff memory pressure leak page fragments until host memory availability degrades.

The record

CVE
CVE-2026-46322
Published
Jun 9, 2026
Updated
Jun 9, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.001
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=043d222f93ab8c76b56a3b315cd8692e35affb6c <4fefc6156a162a9f50035c12091a5e5130c82c6e
  2. Affected versionversion=043d222f93ab8c76b56a3b315cd8692e35affb6c <aa308e9dbb9acb17cacdbbce9e4504f69bac8385
  3. Affected versionversion=043d222f93ab8c76b56a3b315cd8692e35affb6c <aa8963fdce667a42fb7f0bdd2909fadcab02f9a8
  4. Affected versionversion=043d222f93ab8c76b56a3b315cd8692e35affb6c <d16e38fac09a47bfcf98c1ad65a1bb53f94540f5
  5. Affected versionversion=4.20

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=043d222f93ab8c76b56a3b315cd8692e35affb6c <4fefc6156a162a9f50035c12091a5e5130c82c6e; version=043d222f93ab8c76b56a3b315cd8692e35affb6c <aa308e9dbb9acb17cacdbbce9e4504f69bac8385; version=043d222f93ab8c76b56a3b315cd8692e35affb6c <aa8963fdce667a42fb7f0bdd2909fadcab02f9a8; version=043d222f93ab8c76b56a3b315cd8692e35affb6c <d16e38fac09a47bfcf98c1ad65a1bb53f94540f5; version=4.20

Published CVSS scores

7.1LinuxCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.001OS Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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