CVE-2026-74527

PF packet-parsing corruption via VF allocation

Published Aug 15, 2026 · Updated Aug 15, 2026

Improper resource isolation in the Linux kernel allows local users to corrupt shared CGX packet-parsing state through VF allocation. The VF NIX LF allocation path resets the shared LMAC RX PKIND and default TX parse configuration instead of preserving the PF's special parsing setup. Exploitation requires an OcteonTX2 CGX LMAC shared by a PF and VF with HiGig2 or EDSA enabled, and the overwrite disrupts PF packet handling.

CVSS severity8.8
High
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

Improper resource isolation in the Linux kernel allows local users to corrupt shared CGX packet-parsing state through VF allocation. The VF NIX LF allocation path resets the shared LMAC RX PKIND and default TX parse configuration instead of preserving the PF's special parsing setup. Exploitation requires an OcteonTX2 CGX LMAC shared by a PF and VF with HiGig2 or EDSA enabled, and the overwrite disrupts PF packet handling.

The record

CVE
CVE-2026-74527
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=4.20
  2. Affected versionversion=94d942c5fb970ac2166216838b278613decfa9a0 <3bd438a58e910db5dc369aa25dfed1fc95f1b596
  3. Affected versionversion=94d942c5fb970ac2166216838b278613decfa9a0 <d3c6b0f48f126a36955b3fb4154a59d0b3621d97

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.20; version=94d942c5fb970ac2166216838b278613decfa9a0 <3bd438a58e910db5dc369aa25dfed1fc95f1b596; version=94d942c5fb970ac2166216838b278613decfa9a0 <d3c6b0f48f126a36955b3fb4154a59d0b3621d97

Published CVSS scores

6.4Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:L/A:H
8.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
6.4SUSECVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:L/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 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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