CVE-2026-97568
In the Linux kernel, the following vulnerability has been resolved: mptcp: syncookies: remember the request backup flag Instead of using an uninitialised bit when copying the info in subflow_ulp_clone(). To fix this, no need to extend the join_entry structure: backup is coming from struct mptcp_subflow_request_sock, only one bit. Do the same here by using one bit for both.
Affected versions
Linux kernel versions
5.10.224,
5.15.165,
6.1.104,
6.6.45,
6.10.4,
6.11
and later are affected. Fixed in
5.10.271,
5.15.222,
6.1.189,
6.6.158,
6.12.111,
6.18.53,
7.2.7,
7.3-rc3
and their respective stable series.
References
8 totalFrequently asked questions
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What is CVE-2026-97568?
CVE-2026-97568 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.10.224 onward and has been patched in 5.10.271, 5.15.222, 6.1.189 and others. CVE-2026-97568 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-97568?
Yes. CVE-2026-97568 has been patched. Fixed versions include 5.10.271, 5.15.222, 6.1.189 and others. If you are running Linux kernel 5.10.224 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-97568 actively exploited?
No. CVE-2026-97568 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.