CVE-2026-74495Network attack vector

Resource exhaustion via off-by-one DMA cleanup

Published Aug 15, 2026 · Updated Aug 15, 2026

DMA resource leakage in the Linux kernel igbvf driver from 2.6.33 allows remote attackers to interrupt networking through transmitted traffic. The dma_error cleanup decrements count before its unmapping loop, skipping the packet head when a later fragment mapping fails. The path requires the igbvf virtual-function driver and a TX mapping failure after the head was mapped, leaving one DMA mapping allocated per trigger.

CVSS severity9.8
Critical
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DMA resource leakage in the Linux kernel igbvf driver from 2.6.33 allows remote attackers to interrupt networking through transmitted traffic. The dma_error cleanup decrements count before its unmapping loop, skipping the packet head when a later fragment mapping fails. The path requires the igbvf virtual-function driver and a TX mapping failure after the head was mapped, leaving one DMA mapping allocated per trigger.

The record

CVE
CVE-2026-74495
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

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=2.6.33
  2. Affected versionversion=c1fa347f20f17f14a4a1575727fa24340e8a9117 <0565052b7e2f436b7f1541f4849da96dc0aa7a0e
  3. Affected versionversion=c1fa347f20f17f14a4a1575727fa24340e8a9117 <31089f4eab42e0fc248ec80c26f9b0bad59ba4cc
  4. Affected versionversion=c1fa347f20f17f14a4a1575727fa24340e8a9117 <845a9cdd9b03b7b6fa8de3ee80579780350a7f65
  5. Affected versionversion=c1fa347f20f17f14a4a1575727fa24340e8a9117 <bc25d56c03e41c10bc4b40e99ca5d7b941675c04
  6. Affected versionversion=c1fa347f20f17f14a4a1575727fa24340e8a9117 <df07003b5a6c6c9fce60d765d6a3da815a74c41c

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.33; version=c1fa347f20f17f14a4a1575727fa24340e8a9117 <0565052b7e2f436b7f1541f4849da96dc0aa7a0e; version=c1fa347f20f17f14a4a1575727fa24340e8a9117 <31089f4eab42e0fc248ec80c26f9b0bad59ba4cc; version=c1fa347f20f17f14a4a1575727fa24340e8a9117 <845a9cdd9b03b7b6fa8de3ee80579780350a7f65; version=c1fa347f20f17f14a4a1575727fa24340e8a9117 <bc25d56c03e41c10bc4b40e99ca5d7b941675c04; version=c1fa347f20f17f14a4a1575727fa24340e8a9117 <df07003b5a6c6c9fce60d765d6a3da815a74c41c

Published CVSS scores

9.8Linux Kernel CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.7SUSECVSS:3.1/AV:L/AC:H/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)
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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