CVE-2026-74701

Kernel crash via short Ethernet header

Published Aug 22, 2026 · Updated Aug 25, 2026

Out-of-bounds read in the Linux kernel Open vSwitch path allows local users to crash the kernel through a short packet from a TUN device. key_extract() trusts an ETH_P_TEB protocol value and pulls Ethernet addresses and an EtherType without first ensuring that 14 header bytes are present. Reachability requires local low-privilege access and an ARPHRD_NONE device such as TUN; the documented consequence is a kernel BUG and host crash.

CVSS severity7.8
High
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

Out-of-bounds read in the Linux kernel Open vSwitch path allows local users to crash the kernel through a short packet from a TUN device. key_extract() trusts an ETH_P_TEB protocol value and pulls Ethernet addresses and an EtherType without first ensuring that 14 header bytes are present. Reachability requires local low-privilege access and an ARPHRD_NONE device such as TUN; the documented consequence is a kernel BUG and host crash.

The record

CVE
CVE-2026-74701
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=217ac77a3c2524d999730b2a80b61fcc2d0f734a <0b60b55652ba772b173dddc63f3851e1d2dd5927
  2. Affected versionversion=217ac77a3c2524d999730b2a80b61fcc2d0f734a <81f9b09f0ea3ba9ab966dd17e9f32625a14555e9
  3. Affected versionversion=217ac77a3c2524d999730b2a80b61fcc2d0f734a <831471718f6e19aed1a330b03b53190a90e06466
  4. Affected versionversion=217ac77a3c2524d999730b2a80b61fcc2d0f734a <9b8cfbb58b85bfa7a78fac47fdc77396cd01f699
  5. Affected versionversion=217ac77a3c2524d999730b2a80b61fcc2d0f734a <a8139285c8925efe59af28a9169bb2fda91bff15
  6. Affected versionversion=217ac77a3c2524d999730b2a80b61fcc2d0f734a <cf6f8b29befb92173659bcef6a441d274947bfae
  7. Affected versionversion=217ac77a3c2524d999730b2a80b61fcc2d0f734a <d8bea341b183190ce6c055ab0e64ab78eb9a7290
  8. Affected versionversion=217ac77a3c2524d999730b2a80b61fcc2d0f734a <e85278afd4890dd190ba3c7a1b1a712b801c9fe1
  9. Affected versionversion=4.10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=217ac77a3c2524d999730b2a80b61fcc2d0f734a <0b60b55652ba772b173dddc63f3851e1d2dd5927; version=217ac77a3c2524d999730b2a80b61fcc2d0f734a <81f9b09f0ea3ba9ab966dd17e9f32625a14555e9; version=217ac77a3c2524d999730b2a80b61fcc2d0f734a <831471718f6e19aed1a330b03b53190a90e06466; version=217ac77a3c2524d999730b2a80b61fcc2d0f734a <9b8cfbb58b85bfa7a78fac47fdc77396cd01f699; version=217ac77a3c2524d999730b2a80b61fcc2d0f734a <a8139285c8925efe59af28a9169bb2fda91bff15; version=217ac77a3c2524d999730b2a80b61fcc2d0f734a <cf6f8b29befb92173659bcef6a441d274947bfae; version=217ac77a3c2524d999730b2a80b61fcc2d0f734a <d8bea341b183190ce6c055ab0e64ab78eb9a7290; version=217ac77a3c2524d999730b2a80b61fcc2d0f734a <e85278afd4890dd190ba3c7a1b1a712b801c9fe1; version=4.10

Published CVSS scores

7.8Linux CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Red HatCVSS: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-125Out-of-bounds Read
T1499.004Application or System Exploitation

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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