CVE-2026-43345Network attack vector

System hang via unprogrammed IPA event ring

Published May 8, 2026 · Updated May 8, 2026

Denial of service in the IPA driver in Linux Kernel allows remote attackers to hang affected systems through network activity. The IPA v5.0 register definition assigns ERINDEX rather than CH_ERINDEX in the CH_C_CNTXT_1 field mask, so GSI channels lack a valid event ring and gsi_channel_trans_quiesce() waits forever for transfer completion. Exposure requires IPA v5.0 or later hardware; the failure was reproduced on IPA v5.2 during runtime suspend, system suspend, and remoteproc stop, and it leaves the IPA data path nonfunctional.

CVSS severity7.5
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the IPA driver in Linux Kernel allows remote attackers to hang affected systems through network activity. The IPA v5.0 register definition assigns ERINDEX rather than CH_ERINDEX in the CH_C_CNTXT_1 field mask, so GSI channels lack a valid event ring and gsi_channel_trans_quiesce() waits forever for transfer completion. Exposure requires IPA v5.0 or later hardware; the failure was reproduced on IPA v5.2 during runtime suspend, system suspend, and remoteproc stop, and it leaves the IPA data path nonfunctional.

The record

CVE
CVE-2026-43345
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 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=6.4
  2. Affected versionversion=faf0678ec8a0aa9039d8b188d012206abd67dd5c <2bf18b643c4656413f7cfd5615af60a6b4e261da
  3. Affected versionversion=faf0678ec8a0aa9039d8b188d012206abd67dd5c <2d2dc166d55148cfcf8ae67b415f8d6d110e6fca
  4. Affected versionversion=faf0678ec8a0aa9039d8b188d012206abd67dd5c <34c988bb04cbdf093d2134e179433da49ffcd044
  5. Affected versionversion=faf0678ec8a0aa9039d8b188d012206abd67dd5c <56007972c0b1e783ca714d6f1f4d6e66e531d21f
  6. Affected versionversion=faf0678ec8a0aa9039d8b188d012206abd67dd5c <ae8343a19ccb051d519dbb3a9082ddea9f0551d3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.4; version=faf0678ec8a0aa9039d8b188d012206abd67dd5c <2bf18b643c4656413f7cfd5615af60a6b4e261da; version=faf0678ec8a0aa9039d8b188d012206abd67dd5c <2d2dc166d55148cfcf8ae67b415f8d6d110e6fca; version=faf0678ec8a0aa9039d8b188d012206abd67dd5c <34c988bb04cbdf093d2134e179433da49ffcd044; version=faf0678ec8a0aa9039d8b188d012206abd67dd5c <56007972c0b1e783ca714d6f1f4d6e66e531d21f; version=faf0678ec8a0aa9039d8b188d012206abd67dd5c <ae8343a19ccb051d519dbb3a9082ddea9f0551d3

Published CVSS scores

7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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