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CVE-2026-97566— mptcp: pm: kernel: drop pending ADD_ADDR when removing ID0

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，已修复以下漏洞： mptcp: pm: kernel: 在移除 ID0 端点时丢弃待处理的 ADD_ADDR 消息 在内核 MPTCP（多路径 TCP）路径管理器中，当移除 ID 0 端点时，可能会遗留一个过期的 ADD_ADDR 通告条目。这是因为 ID 0 的移除路径不会拆除待处理的通告，而非零 ID 的移除路径则会进行清理。 当路径管理器（PM）在添加另一个信号端点后重新选择 ID 0 时，它会发现该过期的 anno_list 条目，并在 中触发 警告。 根本原因： 移除路径之间的不对

AI Predicted 5.5 Difficulty: Hard EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1564.001 · Hidden Files and Directories

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 740d798e8767d8a449902b1a1bbc70facfce19b5< bacf23e7c9876c9f4170166b3597cb22ea3ed39b affected
740d798e8767d8a449902b1a1bbc70facfce19b5< d4a67a880654e1bfe318a31bea0bdbb026a09ade affected
740d798e8767d8a449902b1a1bbc70facfce19b5< 545616b4e7325be3c61fc082538cb06d14f7b1db affected
740d798e8767d8a449902b1a1bbc70facfce19b5< 2ac7d6e620764f1fc79eb4edd3610a7a661981ca affected
5.13 affected
< 5.13 unaffected
6.12.112≤ 6.12.* unaffected
6.18.53≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-97566

Vulnerability Information
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Vulnerability Title
mptcp: pm: kernel: drop pending ADD_ADDR when removing ID0
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: kernel: drop pending ADD_ADDR when removing ID0 The in-kernel MPTCP path manager can leave a stale ADD_ADDR announcement entry alive when removing the id 0 endpoint. This happens because the id 0 removal path does not tear down pending announcements, unlike the non-zero id path. When the PM later reselects id 0 after adding another signal endpoint, it finds the stale anno_list entry and hits WARN_ON_ONCE(mptcp_pm_is_kernel()) in mptcp_pm_announced_alloc(). Root cause: asymmetry between removal paths. - Non-zero id path: mptcp_nl_remove_subflow_and_signal_addr() calls mptcp_pm_remove_announced() to clean up. - Id 0 path: mptcp_nl_remove_id_zero_address() skips cleanup entirely. Fix by making the id 0 path symmetric: call mptcp_pm_announced_remove() and decrement add_addr_signaled before queuing the RM_ADDR. Subtle detail: signal endpoints are stored in anno_list with port 0, but msk_local carries the connection's local port. In other words, entries linked to ID0 paths should have port == 0. A follow-up patch will ensure that. mptcp_pm_announced_remove() uses use_port=true for comparison. So clear the port before the lookup.
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 740d798e8767d8a449902b1a1bbc70facfce19b5 ~ bacf23e7c9876c9f4170166b3597cb22ea3ed39b -
Linux Linux 5.13 -

II. Public POCs for CVE-2026-97566

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III. Intelligence Information for CVE-2026-97566

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Patches & Fixes for CVE-2026-97566 (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-2026-97566

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