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CVE-2026-97568

mptcp: syncookies: remember the request backup flag

N/A
Published: September 25, 2026 at 10:21 AM UTC
Updated: October 19, 2026 at 10:17 AM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
N/A
Exploit prediction
EPSS 0.2%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
90%
09176f80995105c62939728fbad5c437d61e7ff41008f2bcbc8e461c1df3aebba30ac4f616ebe5705.10.2245.15.1656.1.1046.10.46.116.6.456f01f41b6a492ddf2da7609967cfaf57e7ca48a773e2baa301ee3f62ff971e68877adeb37f98cc678ed3e34c766e8264d5d2e0436f86c51604d6a8a79176f80995105c62939728fbad5c437d61e7ff4efd340bf3d7779a3a8ec954d8ec0fb8a10f24982
Vendor states this is fixed in 00b2bd518911e0daab00f4749cce68c191ccebb4 (fixed)
Vendor states this is fixed in 06d649f9cd03a9f8e768a658b20acf8d2c8022e0 (fixed)
Vendor states this is fixed in 1668b34452009d27be3262646de748a3e48ffd51 (fixed)
Vendor states this is fixed in 360d99258a6402cb8e49771460944f19f04d25b7 (fixed)
Vendor states this is fixed in 61178d0b85b4b1b53e78b06e89d018d22d102f88 (fixed)
Vendor states this is fixed in b138e7dc719f0a3949de8bb6500b8cf1604eea06 (fixed)
Vendor states this is fixed in b76c0e28b392620dfbaf92cdeedbf115820b44cb (fixed)
Vendor states this is fixed in c97fa2c7ada82d4cac1c6c00643238dc4c462f15 (fixed)
Vendor states this is fixed in 5.10.271 (unaffected)
Vendor states this is fixed in 5.15.222 (unaffected)
Vendor states this is fixed in 6.1.189 (unaffected)
Vendor states this is fixed in 6.11 (unaffected)
Vendor states this is fixed in 6.12.111 (unaffected)
Vendor states this is fixed in 6.18.53 (unaffected)
Vendor states this is fixed in 6.6.158 (unaffected)
Vendor states this is fixed in 7.2.7 (unaffected)
Vendor states this is fixed in 7.3 (unaffected)
Vendor states this is fixed in 7.3-rc3 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (8)

Source: cverecord
https://git.kernel.org/stable/c/61178d0b85b4b1b53e78b06e89d018d22d102f88
Source: cverecord
https://git.kernel.org/stable/c/00b2bd518911e0daab00f4749cce68c191ccebb4
Source: cverecord
https://git.kernel.org/stable/c/06d649f9cd03a9f8e768a658b20acf8d2c8022e0
Source: cverecord
https://git.kernel.org/stable/c/b76c0e28b392620dfbaf92cdeedbf115820b44cb
Source: cverecord
https://git.kernel.org/stable/c/c97fa2c7ada82d4cac1c6c00643238dc4c462f15
Source: cverecord
https://git.kernel.org/stable/c/1668b34452009d27be3262646de748a3e48ffd51
Source: cverecord
https://git.kernel.org/stable/c/b138e7dc719f0a3949de8bb6500b8cf1604eea06
Source: cverecord
https://git.kernel.org/stable/c/360d99258a6402cb8e49771460944f19f04d25b7

Quick Info

StatusRECEIVED

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