Mutipath TCP: Use and Detection, (Mon, Nov 2nd)
Source SANS ISC Handlers Diary
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
Thin evidence
One scorer or none| CNA (Linux) | CVSS 3.1 | 9.8 |
|---|
- 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:HExploitation evidence
Disclosed: evidence found.
CVE published 15 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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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.