CVE-2026-68125

System crash via authentication-tag length underflow

Published Aug 10, 2026 · Updated Aug 10, 2026

Out-of-bounds read in Linux 3.16 through 7.2-rc4 allows physically proximate attackers to crash systems via crafted IEEE 802.15.4 frames. llsec_do_decrypt_auth subtracts the authentication-tag length without first ensuring that the frame payload is at least that long, then passes the wrapped unsigned length to AEAD decryption. An IEEE 802.15.4 interface with link-layer security must process the frame from a peer in radio range; the demonstrated result is a kernel fault.

CVSS severity8.8
High
EPSS probability0.32%
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 Linux 3.16 through 7.2-rc4 allows physically proximate attackers to crash systems via crafted IEEE 802.15.4 frames. llsec_do_decrypt_auth subtracts the authentication-tag length without first ensuring that the frame payload is at least that long, then passes the wrapped unsigned length to AEAD decryption. An IEEE 802.15.4 interface with link-layer security must process the frame from a peer in radio range; the demonstrated result is a kernel fault.

The record

CVE
CVE-2026-68125
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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=3.16
  2. Affected versionversion=4c14a2fb5d143e4ed94143be2b8c1961b47df9af <5bbf0cd9b6a7076af86c75e87e180099be2e11ae
  3. Affected versionversion=4c14a2fb5d143e4ed94143be2b8c1961b47df9af <de80808f37d99c6dc67bb6f97eea00c8f57a8821
  4. Affected versionversion=4c14a2fb5d143e4ed94143be2b8c1961b47df9af <e09e0301d616c1ef38a5e64e8e4326fd39df13cc
  5. Affected versionversion=4c14a2fb5d143e4ed94143be2b8c1961b47df9af <f20dedce0429b293d4bad604e0d3f65d8ac96c83
  6. Affected versionversion=4c14a2fb5d143e4ed94143be2b8c1961b47df9af <fd3a3f28ed60c6af4b2a39933b151d6b27842c3b

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.16; version=4c14a2fb5d143e4ed94143be2b8c1961b47df9af <5bbf0cd9b6a7076af86c75e87e180099be2e11ae; version=4c14a2fb5d143e4ed94143be2b8c1961b47df9af <de80808f37d99c6dc67bb6f97eea00c8f57a8821; version=4c14a2fb5d143e4ed94143be2b8c1961b47df9af <e09e0301d616c1ef38a5e64e8e4326fd39df13cc; version=4c14a2fb5d143e4ed94143be2b8c1961b47df9af <f20dedce0429b293d4bad604e0d3f65d8ac96c83; version=4c14a2fb5d143e4ed94143be2b8c1961b47df9af <fd3a3f28ed60c6af4b2a39933b151d6b27842c3b

Published CVSS scores

6.5SUSECVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5Amazon LinuxCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.8Linux Kernel CNACVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.1SUSECVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.0Oracle LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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