Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

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。

AI Predicted 7.5 Difficulty: Hard

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
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-80586

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

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
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 648ef4b88673dadb8463bf0d4b10fbf33d55def8 ~ 15e35fdad7a5576bf3f1c8d688877aeb5d1b506b -
Linux Linux 5.6 -

II. Public POCs for CVE-2026-80586

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-80586

请登录查看更多情报信息。

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

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

CVE-2026-80557 libceph: fix OOB read in decode_watchers() via missing bounds check
CVE-2026-80553 s390/vfio_ccw: Cancel existing workqueues
CVE-2026-80552 s390/vfio_ccw: Ensure index for read/write regions are within range
CVE-2026-80549 s390/vfio_ccw: Move cp cleanup out of not operational
CVE-2026-80546 s390/zcrypt: Improve CCA CPRB length and overflow checks
CVE-2026-80547 s390/vfio_ccw: Implement a crw lock
CVE-2026-80545 s390/zcrypt: Improve EP11 CPRB length and overflow checks
CVE-2026-80543 s390/zcrypt: Pad trailing CCA or EP11 message with zeros
CVE-2026-80548 s390/vfio_ccw: Selectively expand io_mutex
CVE-2026-80555 s390/vfio_ccw: Free all memory if cp_init() fails
CVE-2026-80554 s390/vfio_ccw: Limit the number of channel program segments
CVE-2026-80556 mmc: atmel-mci: Fix use-after-free in atmci_remove due to race condition
CVE-2026-80559 Input: sur40 - fix input device registration ordering
CVE-2026-80558 libceph: Avoid using invalid osd indices from primary_temp
CVE-2026-80560 openrisc: signal: do not restore privileged SR bits on sigreturn
CVE-2026-80561 libceph: fix multiple unsafe decodes in decode_locker()
CVE-2026-80562 gpio: ml-ioh: use raw_spinlock_t for the register lock
CVE-2026-80563 gpio: sloppy-logic-analyzer: fix use-after-free via debugfs trigger on unbind
CVE-2026-80564 gve: fix NULL dereference due to missing ptp adjfine
CVE-2026-80565 crypto: qce - fix error path in devm_qce_register_algs

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-80586

No comments yet

Leave a comment