CVE-2026-74309

Service interruption via incorrect IRQ ring indexing

Published Aug 15, 2026 · Updated Aug 15, 2026

Incorrect IRQ-to-ring mapping in Linux kernel 6.14 allows local users to interrupt service on systems using octeon_ep vDPA devices. The driver's interrupt handler subtracts the first stored IRQ number from the delivered IRQ instead of locating that IRQ in oct_hw->irqs, so non-contiguous assignments select the wrong ring. The condition requires a configured Octeon EP vDPA device with non-contiguous IRQ numbers; mishandled interrupts can destabilize the host.

CVSS severity5.5
Medium
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect IRQ-to-ring mapping in Linux kernel 6.14 allows local users to interrupt service on systems using octeon_ep vDPA devices. The driver's interrupt handler subtracts the first stored IRQ number from the delivered IRQ instead of locating that IRQ in oct_hw->irqs, so non-contiguous assignments select the wrong ring. The condition requires a configured Octeon EP vDPA device with non-contiguous IRQ numbers; mishandled interrupts can destabilize the host.

The record

CVE
CVE-2026-74309
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-131, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=26f8ce06af6475b33b0bc60261e9f5027f9af58f <0d21a1d6375a05274291e32c1ab7cd57dbb69513
  2. Affected versionversion=26f8ce06af6475b33b0bc60261e9f5027f9af58f <3ef0cfa77a3d526591be069850d186c255e3f0cc
  3. Affected versionversion=26f8ce06af6475b33b0bc60261e9f5027f9af58f <c6c7eae5de798442987619434171ac886035d57c
  4. Affected versionversion=6.14

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=26f8ce06af6475b33b0bc60261e9f5027f9af58f <0d21a1d6375a05274291e32c1ab7cd57dbb69513; version=26f8ce06af6475b33b0bc60261e9f5027f9af58f <3ef0cfa77a3d526591be069850d186c255e3f0cc; version=26f8ce06af6475b33b0bc60261e9f5027f9af58f <c6c7eae5de798442987619434171ac886035d57c; version=6.14

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-131Incorrect Calculation of Buffer Size
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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