CVE-2026-68119Network attack vector

Remote memory disclosure via uninitialized TCP-AO padding

Published Aug 10, 2026 · Updated Aug 10, 2026

Information disclosure in the Linux kernel allows remote attackers to read up to three uninitialized bytes via standalone TCP-AO responses. tcp_v4_send_ack() and tcp_v6_send_response() round the option length to four bytes, while tcp_ao_hash_hdr() writes only the MAC and leaves trailing padding uninitialized. Exposure requires a TCP-AO MAC length not divisible by four; the documented standard 12-byte algorithms do not meet that condition.

CVSS severity7.5
High
EPSS probability0.37%
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 the Linux kernel allows remote attackers to read up to three uninitialized bytes via standalone TCP-AO responses. tcp_v4_send_ack() and tcp_v6_send_response() round the option length to four bytes, while tcp_ao_hash_hdr() writes only the MAC and leaves trailing padding uninitialized. Exposure requires a TCP-AO MAC length not divisible by four; the documented standard 12-byte algorithms do not meet that condition.

The record

CVE
CVE-2026-68119
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-908
Attack vector
network
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=6.7
  2. Affected versionversion=decde2586b34b99684faff1eab41e5c496c27fb6 <a859b280441fb02f64ed4037f03d5c0c34a7a595
  3. Affected versionversion=decde2586b34b99684faff1eab41e5c496c27fb6 <bbb7db8c74b0b5d17a695136f0f0806ecd0118f6
  4. Affected versionversion=decde2586b34b99684faff1eab41e5c496c27fb6 <e1a9d3cc11829c5414a75eb39c704f461936eb24
  5. Affected versionversion=decde2586b34b99684faff1eab41e5c496c27fb6 <fadaff3f66e124c3a62237f9c881819a8ac90309

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.7; version=decde2586b34b99684faff1eab41e5c496c27fb6 <a859b280441fb02f64ed4037f03d5c0c34a7a595; version=decde2586b34b99684faff1eab41e5c496c27fb6 <bbb7db8c74b0b5d17a695136f0f0806ecd0118f6; version=decde2586b34b99684faff1eab41e5c496c27fb6 <e1a9d3cc11829c5414a75eb39c704f461936eb24; version=decde2586b34b99684faff1eab41e5c496c27fb6 <fadaff3f66e124c3a62237f9c881819a8ac90309

Published CVSS scores

7.5Linux Kernel CVE TeamCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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 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

CWE-908Use of Uninitialized Resource

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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