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CVE-2026-45889— mptcp: do not account for OoO in mptcp_rcvbuf_grow()

AI Predicted 6.5 Difficulty: Theoretical EPSS 0.15% · P5

Affected Version Matrix 8

VendorProductVersion RangeStatus
LinuxLinuxe118cdc34dd109562b64f6a397f68cd33b041d5b< fb7bf00b04a6b48859f52035d4e745848c2b4c79affected
e118cdc34dd109562b64f6a397f68cd33b041d5b< 400ee4854adef1e4983812a3decf6717ea020136affected
e118cdc34dd109562b64f6a397f68cd33b041d5b< 6b329393502e5857662b851a13f947209c588587affected
6.18affected
< 6.18unaffected
6.18.14≤ 6.18.*unaffected
6.19.4≤ 6.19.*unaffected
7.0≤ *unaffected
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I. Basic Information for CVE-2026-45889

Vulnerability Information
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Vulnerability Title
mptcp: do not account for OoO in mptcp_rcvbuf_grow()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mptcp: do not account for OoO in mptcp_rcvbuf_grow() MPTCP-level OoOs are physiological when multiple subflows are active concurrently and will not cause retransmissions nor are caused by drops. Accounting for them in mptcp_rcvbuf_grow() causes the rcvbuf slowly drifting towards tcp_rmem[2]. Remove such accounting. Note that subflows will still account for TCP-level OoO when the MPTCP-level rcvbuf is propagated. This also closes a subtle and very unlikely race condition with rcvspace init; active sockets with user-space holding the msk-level socket lock, could complete such initialization in the receive callback, after that the first OoO data reaches the rcvbuf and potentially triggering a divide by zero Oops.
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于mptcp接收缓冲区增长时错误地计入乱序数据，可能导致接收缓冲区漂移和除零错误。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux e118cdc34dd109562b64f6a397f68cd33b041d5b ~ fb7bf00b04a6b48859f52035d4e745848c2b4c79 -
LinuxLinux 6.18 -

II. Public POCs for CVE-2026-45889

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III. Intelligence Information for CVE-2026-45889

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Patches & Fixes for CVE-2026-45889 (3)

Same Patch Batch · Linux · 2026-05-27 · 275 CVEs total

CVE-2026-460399.8 CRITICALrxgk: Fix potential integer overflow in length check
CVE-2026-458989.8 CRITICALRDMA/iwcm: Fix workqueue list corruption by removing work_list
CVE-2026-459729.8 CRITICALsmb: client: fix potential UAF and double free in smb2_open_file()
CVE-2026-459889.8 CRITICALrxrpc: Fix re-decryption of RESPONSE packets
CVE-2026-460439.1 CRITICALRDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv
CVE-2026-459458.8 HIGHiommu/vt-d: Fix race condition during PASID entry replacement
CVE-2026-460568.8 HIGHBluetooth: hci_event: fix potential UAF in SSP passkey handlers
CVE-2025-713118.2 HIGHfs/ntfs3: Initialize new folios before use
CVE-2026-460378.2 HIGHipv4: icmp: validate reply type before using icmp_pointers
CVE-2026-458438.2 HIGHslip: bound decode() reads against the compressed packet length
CVE-2026-460108.1 HIGHrxrpc: Fix error handling in rxgk_extract_token()
CVE-2026-460998.1 HIGHnet: ipv6: fix NOREF dst use in seg6 and rpl lwtunnels
CVE-2026-460767.9 HIGHKVM: nSVM: Raise #UD if unhandled VMMCALL isn't intercepted by L1
CVE-2026-459107.8 HIGHRDMA/rxe: Fix race condition in QP timer handlers
CVE-2026-458627.8 HIGHiommu/vt-d: Flush cache for PASID table before using it
CVE-2026-459567.8 HIGHdrm/exynos: vidi: use priv->vidi_dev for ctx lookup in vidi_connection_ioctl()
CVE-2026-460367.8 HIGHvfio/cdx: Serialize VFIO_DEVICE_SET_IRQS with a per-device mutex
CVE-2026-461007.8 HIGHfs: afs: revert mmap_prepare() change
CVE-2026-458947.8 HIGHiommu/vt-d: Clear Present bit before tearing down PASID entry
CVE-2026-459337.8 HIGHbpf: Preserve id of register in sync_linked_regs()

Showing top 20 of 275 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-45889

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