CVE-2026-43445

Service interruption via leaked TX DMA mappings

Published May 8, 2026 · Updated May 8, 2026

A memory leak in Linux Kernel e1000/e1000e drivers allows local users to interrupt service through failed TX buffer mappings. In e1000_main.c and netdev.c, dma_error decrements count before cleanup, so one successfully mapped TX buffer remains mapped when a later mapping fails. Local low-privileged access and an active affected driver are required; repeated mapping failures consume DMA resources and interrupt service.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A memory leak in Linux Kernel e1000/e1000e drivers allows local users to interrupt service through failed TX buffer mappings. In e1000_main.c and netdev.c, dma_error decrements count before cleanup, so one successfully mapped TX buffer remains mapped when a later mapping fails. Local low-privileged access and an active affected driver are required; repeated mapping failures consume DMA resources and interrupt service.

The record

CVE
CVE-2026-43445
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1499.004
Attack vector
local
Privileges
authenticated

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=2.6.33
  2. Affected versionversion=c1fa347f20f17f14a4a1575727fa24340e8a9117 <0606c24a745bafd1be5d66c48361638cd9cad74b
  3. Affected versionversion=c1fa347f20f17f14a4a1575727fa24340e8a9117 <0a1fc25deabab4efce64610e3c449485c4fa8f5f
  4. Affected versionversion=c1fa347f20f17f14a4a1575727fa24340e8a9117 <10b5e65959e955a1c8894e0a5413944b5a70204a
  5. Affected versionversion=c1fa347f20f17f14a4a1575727fa24340e8a9117 <30e87ade8d678c25a8546cf38c0b498fa5cb27d3
  6. Affected versionversion=c1fa347f20f17f14a4a1575727fa24340e8a9117 <519051c711dfd239ef6e4b28878efee400a035f9
  7. Affected versionversion=c1fa347f20f17f14a4a1575727fa24340e8a9117 <7eaeb778bfaa3b2a804f89321c234d59c74569db
  8. Affected versionversion=c1fa347f20f17f14a4a1575727fa24340e8a9117 <e94eaef11142b01f77bf8ba4d0b59720b7858109
  9. Affected versionversion=c1fa347f20f17f14a4a1575727fa24340e8a9117 <fa5ba9867a55e640df0dc79bf0199770fb043f03

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.33; version=c1fa347f20f17f14a4a1575727fa24340e8a9117 <0606c24a745bafd1be5d66c48361638cd9cad74b; version=c1fa347f20f17f14a4a1575727fa24340e8a9117 <0a1fc25deabab4efce64610e3c449485c4fa8f5f; version=c1fa347f20f17f14a4a1575727fa24340e8a9117 <10b5e65959e955a1c8894e0a5413944b5a70204a; version=c1fa347f20f17f14a4a1575727fa24340e8a9117 <30e87ade8d678c25a8546cf38c0b498fa5cb27d3; version=c1fa347f20f17f14a4a1575727fa24340e8a9117 <519051c711dfd239ef6e4b28878efee400a035f9; version=c1fa347f20f17f14a4a1575727fa24340e8a9117 <7eaeb778bfaa3b2a804f89321c234d59c74569db; version=c1fa347f20f17f14a4a1575727fa24340e8a9117 <e94eaef11142b01f77bf8ba4d0b59720b7858109; version=c1fa347f20f17f14a4a1575727fa24340e8a9117 <fa5ba9867a55e640df0dc79bf0199770fb043f03

Published CVSS scores

5.5NIST NVDCVSS: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-401Missing Release of Memory after Effective Lifetime
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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