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CVE-2026-53183— mptcp: allow subflow rcv wnd to shrink

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.

Linux kernel是美国Linux基金会开源的操作系统Linux所使用的内核。 Linux kernel 5.19版本存在安全漏洞，该漏洞源于mptcp连接中TCP窗口处理问题，可能导致当传入数据在TCP层面被确认且处于MPTCP序列空间乱序或落入backlog时，TCP栈独立确保的右边界不向后移动会人为膨胀MPTCP接收窗口，从而造成传入流量在发送方正常的情况下超过接收方rcvbuf大小。攻击者可利用该漏洞造成拒绝服务。

CVSS 7.5 · High EPSS 0.49% · P41

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux f3589be0c420a3137e5902d15705ced6a36f3f43< bf364b0f10b27679140699821f88af7f01e2a6e3 affected
f3589be0c420a3137e5902d15705ced6a36f3f43< b1fd13074f22105deec45aa02283e322733e0c2d affected
f3589be0c420a3137e5902d15705ced6a36f3f43< aa3861f40ac32706d9e97bfac76984613e278788 affected
f3589be0c420a3137e5902d15705ced6a36f3f43< 653245266913f03fcf21cbca68eed5c197a33e52 affected
f3589be0c420a3137e5902d15705ced6a36f3f43< c297a4e65c50a2b807d9309b22615080faffa8f3 affected
f3589be0c420a3137e5902d15705ced6a36f3f43< da23be77e1292cd611e736c3aa17da633d7ddce7 affected
5.19 affected
< 5.19 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-53183

Vulnerability Information
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Vulnerability Title
mptcp: allow subflow rcv wnd to shrink
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mptcp: allow subflow rcv wnd to shrink In MPTCP connection, the `window` field in the TCP header refers to the MPTCP-level rcv_nxt and it's right edge should not move backward. Such constraint is enforced at DSS option generation time. At the same time, the TCP stack ensures independently that the TCP-level rcv wnd right's edge does not move backward. That in turn causes artificial inflating of the MPTCP rcv window when the incoming data is acked at the TCP level and is OoO in the MPTCP sequence space (or lands in the backlog). As a consequence, the incoming traffic can exceed the receiver rcvbuf size even when the sender is not misbehaving. Prevent such scenario forcibly allowing the TCP subflow to shrink the TCP-level rcv wnd regardless of the current netns setting.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的操作系统Linux所使用的内核。 Linux kernel 5.19版本存在安全漏洞，该漏洞源于mptcp连接中TCP窗口处理问题，可能导致当传入数据在TCP层面被确认且处于MPTCP序列空间乱序或落入backlog时，TCP栈独立确保的右边界不向后移动会人为膨胀MPTCP接收窗口，从而造成传入流量在发送方正常的情况下超过接收方rcvbuf大小。攻击者可利用该漏洞造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux f3589be0c420a3137e5902d15705ced6a36f3f43 ~ bf364b0f10b27679140699821f88af7f01e2a6e3 -
Linux Linux 5.19 -

II. Public POCs for CVE-2026-53183

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III. Intelligence Information for CVE-2026-53183

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Patches & Fixes for CVE-2026-53183 (6)

Same Patch Batch · Linux · 2026-06-25 · 146 CVEs total

CVE-2026-53228 9.8 CRITICAL ipv6: sit: reload inner IPv6 header after GSO offloads
CVE-2026-53247 9.8 CRITICAL net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown
CVE-2026-53246 9.8 CRITICAL sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing
CVE-2026-53151 9.8 CRITICAL rxrpc: Fix the ACK parser to extract the SACK table for parsing
CVE-2026-53260 9.8 CRITICAL tcp: Add preempt_{disable,enable}_nested() in reqsk_queue_hash_req().
CVE-2026-53175 9.8 CRITICAL inet: frags: fix use-after-free caused by the fqdir_pre_exit() flush
CVE-2026-53176 9.8 CRITICAL IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN
CVE-2026-53221 9.8 CRITICAL ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()
CVE-2026-53215 9.8 CRITICAL net: mvpp2: refill RX buffers before XDP or skb use
CVE-2026-53216 9.8 CRITICAL net: mvpp2: limit XDP frame size to the RX buffer
CVE-2026-53131 9.4 CRITICAL netfilter: require Ethernet MAC header before using eth_hdr()
CVE-2026-53225 9.1 CRITICAL sctp: fix uninit-value in __sctp_rcv_asconf_lookup()
CVE-2026-53186 9.1 CRITICAL RDMA/srp: bound SRP_RSP sense copy by the received length
CVE-2026-53224 9.1 CRITICAL sctp: validate embedded INIT chunk and address list lengths in cookie
CVE-2026-53200 8.8 HIGH KVM: arm64: nv: Fix handling of XN[0] when !FEAT_XNX
CVE-2026-53248 8.8 HIGH net: airoha: Fix use-after-free in metadata dst teardown
CVE-2026-53159 8.8 HIGH misc: fastrpc: fix DMA address corruption due to find_vma misuse
CVE-2026-53198 8.8 HIGH ksmbd: fix use-after-free of a deferred file_lock on double SMB2_CANCEL
CVE-2026-53188 8.8 HIGH RDMA/core: Validate the passed in fops for ib_get_ucaps()
CVE-2026-53232 8.8 HIGH net: phy: clean the sfp upstream if phy probing fails

Showing top 20 of 146 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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