CVE-2026-43039Network attack vector

Heap disclosure and allocator corruption via RX dispatch

Published May 1, 2026 · Updated May 1, 2026

Information disclosure in Linux Kernel 6.19 through 6.19.11 allows remote attackers to expose kernel heap data via received network packets. emac_dispatch_skb_zc() allocates an skb but does not copy XDP packet data into it, then wrongly marks the NAPI-frag-backed skb for page-pool recycling. The path requires a TI ICSSG Ethernet interface using AF_XDP zero-copy RX; it passes uninitialized heap bytes to userspace and corrupts page-pool state.

CVSS severity9.8
Critical
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Linux Kernel 6.19 through 6.19.11 allows remote attackers to expose kernel heap data via received network packets. emac_dispatch_skb_zc() allocates an skb but does not copy XDP packet data into it, then wrongly marks the NAPI-frag-backed skb for page-pool recycling. The path requires a TI ICSSG Ethernet interface using AF_XDP zero-copy RX; it passes uninitialized heap bytes to userspace and corrupts page-pool state.

The record

CVE
CVE-2026-43039
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 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=6.19
  2. Affected versionversion=7a64bb388df3cf091afdd047c701039a13acd3b4 <5597dd284ff8c556c0b00f6a34473677426e3f81
  3. Affected versionversion=7a64bb388df3cf091afdd047c701039a13acd3b4 <a968438d4fc17ee1dcdc3cfa490dcb5e7709cf76

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.19; version=7a64bb388df3cf091afdd047c701039a13acd3b4 <5597dd284ff8c556c0b00f6a34473677426e3f81; version=7a64bb388df3cf091afdd047c701039a13acd3b4 <a968438d4fc17ee1dcdc3cfa490dcb5e7709cf76

Published CVSS scores

9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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