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.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
efd340bf3d7779a3a8ec954d8ec0fb8a10f24982 affected < 61178d0b85b4b1b53e78b06e89d018d22d102f88
efd340bf3d7779a3a8ec954d8ec0fb8a10f24982 affected < 00b2bd518911e0daab00f4749cce68c191ccebb4
efd340bf3d7779a3a8ec954d8ec0fb8a10f24982 affected < 06d649f9cd03a9f8e768a658b20acf8d2c8022e0
efd340bf3d7779a3a8ec954d8ec0fb8a10f24982 affected < b76c0e28b392620dfbaf92cdeedbf115820b44cb
1008f2bcbc8e461c1df3aebba30ac4f616ebe570 affected —
6f01f41b6a492ddf2da7609967cfaf57e7ca48a7 affected —
09176f80995105c62939728fbad5c437d61e7ff4 affected —
8ed3e34c766e8264d5d2e0436f86c51604d6a8a7 affected —
73e2baa301ee3f62ff971e68877adeb37f98cc67 affected —
5.10.224 affected < 5.11
5.15.165 affected < 5.16
6.1.104 affected < 6.2
6.6.45 affected < 6.7
6.10.4 affected < 6.11
Linux Linux affected
Version Status Constraints
6.11 affected —
0 unaffected < 6.11
6.12.111 unaffected ≤ 6.12.*
6.18.53 unaffected ≤ 6.18.*
7.2.7 unaffected ≤ 7.2.*
7.3-rc3 unaffected ≤ *

No data.

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/00b2bd518911e0daab00f4749cce68c191ccebb4 cve-icon cve-icon
https://git.kernel.org/stable/c/06d649f9cd03a9f8e768a658b20acf8d2c8022e0 cve-icon cve-icon
https://git.kernel.org/stable/c/61178d0b85b4b1b53e78b06e89d018d22d102f88 cve-icon cve-icon
https://git.kernel.org/stable/c/b76c0e28b392620dfbaf92cdeedbf115820b44cb cve-icon cve-icon
History

Fri, 25 Sep 2026 10:30:00 +0000

Type Values Removed Values Added
Description 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.
Title mptcp: syncookies: remember the request backup flag
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-09-25T10:21:54.269Z

Reserved: 2026-09-24T16:01:01.155Z

Link: CVE-2026-97568

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-25T11:17:07.453

Modified: 2026-09-25T11:17:07.453

Link: CVE-2026-97568

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses

No weakness.