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CVE-2026-80586— mptcp: options: reset DSS fields in case of unexpected size

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，以下漏洞已被修复： mptcp: 选项：在遇到意外大小时重置 DSS 字段 远程对端可能发送一个大小错误的格式错误的 DSS（Data Segmentation Size）子选项，随后紧接着是另一个 DSS 或 MPC + 数据。在这种情况下，第一个子选项将被忽略，但其中部分字段仍会被写入，这可能导致状态不一致或访问未初始化的数据。 修复方式为：当检测到意外的大小时，显式重置那些可能被修改过的字段。

CVSS 9.8 · Critical EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1202 · Indirect Command Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 648ef4b88673dadb8463bf0d4b10fbf33d55def8< 15e35fdad7a5576bf3f1c8d688877aeb5d1b506b affected
648ef4b88673dadb8463bf0d4b10fbf33d55def8< b1256090816ec46011601e084be580731df58fc7 affected
648ef4b88673dadb8463bf0d4b10fbf33d55def8< 192878df582c51d440bf7b91a15f297f29f2b596 affected
648ef4b88673dadb8463bf0d4b10fbf33d55def8< 26dac5c9ffb20812b475fdf253eb04fab99cff3b affected
648ef4b88673dadb8463bf0d4b10fbf33d55def8< 4e80eff5c1c893aca2ac1d202f0b256d2e52ecde affected
648ef4b88673dadb8463bf0d4b10fbf33d55def8< 1fade1b2ac5b1a4948e538fae7313bea57b5ac36 affected
648ef4b88673dadb8463bf0d4b10fbf33d55def8< 27ed642a4e7e4b5df4b8522c72c457a67e052493 affected
648ef4b88673dadb8463bf0d4b10fbf33d55def8< 35772b4981f38ba8059372cde8753e8e477e98ec affected
… +10 more rows
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I. Basic Information for CVE-2026-80586

Vulnerability Information
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Vulnerability Title
mptcp: options: reset DSS fields in case of unexpected size
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mptcp: options: reset DSS fields in case of unexpected size A remote peer could send a malformed DSS with a wrong size, followed by another DSS or MPC + Data. In this case, the first suboption will be ignored, but leaving some fields written, which could lead to inconsistency or access uninitialized data. Explicitly reset the fields that could have been modified in case of unexpected size.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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 648ef4b88673dadb8463bf0d4b10fbf33d55def8 ~ 15e35fdad7a5576bf3f1c8d688877aeb5d1b506b -
Linux Linux 5.6 -

II. Public POCs for CVE-2026-80586

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III. Intelligence Information for CVE-2026-80586

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Patches & Fixes for CVE-2026-80586 (8)

Same Patch Batch · Linux · 2026-08-26 · 92 CVEs total

CVE-2026-80589 9.8 CRITICAL block: stop the timeout timer when releasing a never added disk
CVE-2026-74752 9.8 CRITICAL sctp: validate cookie AUTH state before use
CVE-2026-80519 9.8 CRITICAL ovpn: finish crypto callback cleanup before peer release
CVE-2026-74746 9.8 CRITICAL netfilter: flowtable: publish GC-visible tuple last
CVE-2026-80528 9.8 CRITICAL ceph: avoid fs reclaim while using current->journal_info
CVE-2026-74744 9.8 CRITICAL ipvlan: inherit needed_headroom and needed_tailroom from phy_dev
CVE-2026-74743 9.8 CRITICAL macvlan: inherit needed_headroom and needed_tailroom from lowerdev
CVE-2026-80561 9.8 CRITICAL libceph: fix multiple unsafe decodes in decode_locker()
CVE-2026-80558 9.8 CRITICAL libceph: Avoid using invalid osd indices from primary_temp
CVE-2026-80557 9.8 CRITICAL libceph: fix OOB read in decode_watchers() via missing bounds check
CVE-2026-74737 9.8 CRITICAL net: ethernet: ti: am65-cpsw-nuss: Fix port_id extraction from SRC TAG
CVE-2026-80587 9.8 CRITICAL mptcp: avoid combining some incoming suboptions
CVE-2026-80585 9.4 CRITICAL mptcp: fastopen: only mark MPTFO subflows with SYN data
CVE-2026-74751 9.4 CRITICAL riscv: lib: Fix ZBB strnlen reading past count boundary
CVE-2026-80554 9.3 CRITICAL s390/vfio_ccw: Limit the number of channel program segments
CVE-2026-80551 9.3 CRITICAL s390/vfio_ccw: Ensure first IDAW remains constant
CVE-2026-80547 8.8 HIGH s390/vfio_ccw: Implement a crw lock
CVE-2026-80576 8.8 HIGH drm/amdgpu: reject oversized IBs with per-ring packet limits
CVE-2026-80552 8.8 HIGH s390/vfio_ccw: Ensure index for read/write regions are within range
CVE-2026-80553 8.8 HIGH s390/vfio_ccw: Cancel existing workqueues

Showing top 20 of 92 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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