CVE-2026-72444

Service interruption via headerless-device Ethernet address read

Published Aug 15, 2026 · Updated Aug 15, 2026

Uninitialized-memory read in the Linux kernel flow dissector allows local users to interrupt service through traffic on an L3 TUN device. __skb_flow_dissect() copies 12 bytes from eth_hdr() without first confirming that mac_header is set and the device carries Ethernet frames. Reachability requires an L3 TUN device, an eth_src flower filter on a multiq qdisc, and an AF_PACKET sender; the resulting uninitialized key can disrupt packet classification.

CVSS severity5.5
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uninitialized-memory read in the Linux kernel flow dissector allows local users to interrupt service through traffic on an L3 TUN device. __skb_flow_dissect() copies 12 bytes from eth_hdr() without first confirming that mac_header is set and the device carries Ethernet frames. Reachability requires an L3 TUN device, an eth_src flower filter on a multiq qdisc, and an AF_PACKET sender; the resulting uninitialized key can disrupt packet classification.

The record

CVE
CVE-2026-72444
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.2
  2. Affected versionversion=67a900cc0436d74e7ff89042371760def087680d <0fe6455b8e1a22414f39c07bc90a1df12b52ec74
  3. Affected versionversion=67a900cc0436d74e7ff89042371760def087680d <594c90b197141944f25991b8314de5c26ee27a7e
  4. Affected versionversion=67a900cc0436d74e7ff89042371760def087680d <825de39f0c35a112148799b3cbe45af3766c018a
  5. Affected versionversion=67a900cc0436d74e7ff89042371760def087680d <9a65860959db594dfc1820c7fdc09285fb7556bf
  6. Affected versionversion=67a900cc0436d74e7ff89042371760def087680d <bf6e8af2c8be77489bedeae9f8a9654cb710e500
  7. Affected versionversion=67a900cc0436d74e7ff89042371760def087680d <c6d3bcb0f934d4297ac5fa1c8656ae40694fb601

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.2; version=67a900cc0436d74e7ff89042371760def087680d <0fe6455b8e1a22414f39c07bc90a1df12b52ec74; version=67a900cc0436d74e7ff89042371760def087680d <594c90b197141944f25991b8314de5c26ee27a7e; version=67a900cc0436d74e7ff89042371760def087680d <825de39f0c35a112148799b3cbe45af3766c018a; version=67a900cc0436d74e7ff89042371760def087680d <9a65860959db594dfc1820c7fdc09285fb7556bf; version=67a900cc0436d74e7ff89042371760def087680d <bf6e8af2c8be77489bedeae9f8a9654cb710e500; version=67a900cc0436d74e7ff89042371760def087680d <c6d3bcb0f934d4297ac5fa1c8656ae40694fb601

Published CVSS scores

3.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
5.5Oracle LinuxCVSS: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

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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