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Report · SANS ISC Handlers DiaryAbout CVE-2026-98432Published

Mutipath TCP: Use and Detection, (Mon, Nov 2nd)

Source SANS ISC Handlers Diary

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Authoritative record:CVE-2026-98432· Critical 9.8

Not known to be exploited · CVSS 9.8 Critical · fixed in e3f33b0a1d89d738e2b913dab519226eaf76e15b : patch Linux kernel as a priority.

Data as of 2 Nov 2026, 14:58 UTC

CVSS 3.1 base score
9.8Critical
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (Linux)CVSS 3.19.8
Patch
Available – fixed in e3f33b0a1d89d738e2b913dab519226eaf76e15b, b3b027ef0cd322bfa839b9aaf5b27551eea54cf6, a47406c769f72c070386985488f1c4d057df86b2 +5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 15 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 079096f103faca2dd87342cca6f23d4b34da8871, < e3f33b0a1d89d738e2b913dab519226eaf76e15b
Fixed in
  • e3f33b0a1d89d738e2b913dab519226eaf76e15b
LinuxLinuxAffected
  • ≥ 079096f103faca2dd87342cca6f23d4b34da8871, < b3b027ef0cd322bfa839b9aaf5b27551eea54cf6
Fixed in
  • b3b027ef0cd322bfa839b9aaf5b27551eea54cf6
LinuxLinuxAffected
  • ≥ 079096f103faca2dd87342cca6f23d4b34da8871, < a47406c769f72c070386985488f1c4d057df86b2
Fixed in
  • a47406c769f72c070386985488f1c4d057df86b2
LinuxLinuxAffected
  • ≥ 079096f103faca2dd87342cca6f23d4b34da8871, < 742f73df544e03744f2981c467d6542fe8172a2a
Fixed in
  • 742f73df544e03744f2981c467d6542fe8172a2a
LinuxLinuxAffected
  • ≥ 079096f103faca2dd87342cca6f23d4b34da8871, < 95a8c8fa9f27dce64c40c41c062de7728bf34ab5
Fixed in
  • 95a8c8fa9f27dce64c40c41c062de7728bf34ab5
LinuxLinuxAffected
  • ≥ 079096f103faca2dd87342cca6f23d4b34da8871, < 89b5b1eb7d633c33832b7ff2c02e19a144705036
Fixed in
  • 89b5b1eb7d633c33832b7ff2c02e19a144705036

AI-suggested

Monitoring vendor advisories for updates on CVE-2026-98432 is recommended.

Description

A vulnerability (CVE-2026-98432) has been identified in the Linux implementation of Multipath TCP (MPTCP), a TCP extension introduced in 2020 to allow multiple network paths for a single TCP connection. MPTCP enables seamless switching between network interfaces and better bandwidth utilization. The vulnerability concerns the Linux MPTCP implementation as specified in RFC 8684. No specific exploit details or impact scenarios are provided. MPTCP is primarily observed in iOS/iPadOS and is detectable by inspecting TCP option 30 in network traffic.

References

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