VulnerabilityPublished 25 Sep 2026Updated 30 Oct 2026

CVE-2026-97567: Linux kernel · mptcp: prevent race between disconnect() and rtx

Source GCVE Database

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Authoritative record:CVE-2026-97567· Medium

Not known to be exploited · fixed in 2261f857ef4e0d21eb1a8b47b06640cf7ab16d3e : update Linux kernel when convenient.

Data as of 30 Oct 2026, 17:33 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in 2261f857ef4e0d21eb1a8b47b06640cf7ab16d3e, 374da2b9be1280695ce41f108334a8f16e3e54be, 85c580b0d8590520ae00a15c29e9fb9c99427a3e +3

Exploitation evidence

Disclosed: evidence found.
CVE published 25 Sep 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 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-qqvj-8jm5-2jc9

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ b29fcfb54cd70caca5b11c80d8d238854938884a, < 2261f857ef4e0d21eb1a8b47b06640cf7ab16d3e	Fixed in 2261f857ef4e0d21eb1a8b47b06640cf7ab16d3e
LinuxLinux	Affected ≥ b29fcfb54cd70caca5b11c80d8d238854938884a, < 374da2b9be1280695ce41f108334a8f16e3e54be	Fixed in 374da2b9be1280695ce41f108334a8f16e3e54be
LinuxLinux	Affected ≥ b29fcfb54cd70caca5b11c80d8d238854938884a, < 85c580b0d8590520ae00a15c29e9fb9c99427a3e	Fixed in 85c580b0d8590520ae00a15c29e9fb9c99427a3e
LinuxLinux	Affected ≥ b29fcfb54cd70caca5b11c80d8d238854938884a, < 75b3b30ae4ee6aa0572595f6b48544ed4f479eb6	Fixed in 75b3b30ae4ee6aa0572595f6b48544ed4f479eb6
LinuxLinux	Affected ≥ b29fcfb54cd70caca5b11c80d8d238854938884a, < 69a7b2a912672159dda7dcf325d27752d448dfdf	Fixed in 69a7b2a912672159dda7dcf325d27752d448dfdf
LinuxLinux	Affected ≥ b29fcfb54cd70caca5b11c80d8d238854938884a, < 1a68a88369c0ab6309bd17f7e408290c5cb80dcf	Fixed in 1a68a88369c0ab6309bd17f7e408290c5cb80dcf

AI-suggested

A fix has been implemented in the Linux kernel to prevent the race condition by synchronously stopping the retransmission timer. Users should apply the updated kernel version containing this fix once available. No additional mitigation steps are indicated.

Description

A race condition vulnerability in the Linux kernel's Multipath TCP (mptcp) implementation was resolved. The race occurs between the disconnect() function and retransmission timer (rtx) events, which can lead to inconsistent connection status. The fix involves using a synchronous timer stop operation to prevent this race.

References

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