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CVE-2026-97568— mptcp: syncookies: remember the request backup flag

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，以下漏洞已得到修复： mptcp：syncookies：记住请求备份标志 在 subflow_ulp_clone() 中复制信息时，避免使用未初始化的位。 为解决此问题，无需扩展 join_entry 结构体：backup 标志来自 struct mptcp_subflow_request_sock，仅占一位。在此处同样采用单个位来表示两种情况。

AI Predicted 5.5 Difficulty: Theoretical EPSS 0.20% · P9

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux efd340bf3d7779a3a8ec954d8ec0fb8a10f24982< 61178d0b85b4b1b53e78b06e89d018d22d102f88 affected
efd340bf3d7779a3a8ec954d8ec0fb8a10f24982< 00b2bd518911e0daab00f4749cce68c191ccebb4 affected
efd340bf3d7779a3a8ec954d8ec0fb8a10f24982< 06d649f9cd03a9f8e768a658b20acf8d2c8022e0 affected
efd340bf3d7779a3a8ec954d8ec0fb8a10f24982< b76c0e28b392620dfbaf92cdeedbf115820b44cb affected
1008f2bcbc8e461c1df3aebba30ac4f616ebe570 affected
6f01f41b6a492ddf2da7609967cfaf57e7ca48a7 affected
09176f80995105c62939728fbad5c437d61e7ff4 affected
8ed3e34c766e8264d5d2e0436f86c51604d6a8a7 affected
… +12 more rows
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I. Basic Information for CVE-2026-97568

Vulnerability Information
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Vulnerability Title
mptcp: syncookies: remember the request backup flag
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux efd340bf3d7779a3a8ec954d8ec0fb8a10f24982 ~ 61178d0b85b4b1b53e78b06e89d018d22d102f88 -
Linux Linux 6.11 -

II. Public POCs for CVE-2026-97568

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III. Intelligence Information for CVE-2026-97568

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Patches & Fixes for CVE-2026-97568 (4)

Same Patch Batch · Linux · 2026-09-25 · 372 CVEs total

CVE-2026-100075 9.8 CRITICAL RDMA/srpt: Fix srpt_alloc_rw_ctxs() unwind counters
CVE-2026-97957 8.8 HIGH net: hinic: fix mailbox segment buffer overflow
CVE-2026-97527 8.8 HIGH scsi: qla2xxx: Serialize NVMe unsol ctx list with a per-fcport lock
CVE-2026-97528 8.8 HIGH scsi: qla2xxx: Unlink NVMe unsol ctx before freeing on LS reject error
CVE-2026-97555 8.8 HIGH smb: client: fix heap overflow in DACL owner/group rewrite
CVE-2026-98115 8.8 HIGH ksmbd: safely drain sessions during logoff
CVE-2026-97525 8.2 HIGH x86/mm/pat: Allocate split page tables as kernel page tables
CVE-2026-97573 8.1 HIGH bnxt_en: Handle buffer allocation failure in bnxt_rx_ring_reset()
CVE-2026-98070 8.1 HIGH net/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks()
CVE-2026-97570 8.1 HIGH bnxt_en: Bound SW TPA IDs to prevent crashes
CVE-2026-98069 8.1 HIGH net/rds: acquire the fastpath locks in rds_conn_shutdown()
CVE-2026-98130 8.1 HIGH sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START
CVE-2026-98116 7.8 HIGH ALSA: pcm: Serialize PCM mmap with buffer reallocation to fix page UAF
CVE-2026-97903 7.8 HIGH exit: hold a reference to thread_pid across proc_flush_pid
CVE-2026-97548 7.8 HIGH xfs: fix the rtrmap and rtrefcount _maxlevels_ondisk functions
CVE-2026-97611 7.8 HIGH net: openvswitch: fix use-after-free of the flow table mask array
CVE-2026-97612 7.8 HIGH net: mpls: clear inner_protocol when the last label is popped
CVE-2026-98073 7.8 HIGH net: Remove conflicting altnames for dying netns in __dev_change_net_namespace().
CVE-2026-97602 7.8 HIGH inet: frags: invalidate queues before flushing them
CVE-2026-97577 7.8 HIGH media: verisilicon: rockchip: reject AV1 frames exceeding the tile capacity

Showing top 20 of 372 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-97568

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