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CVE-2026-80548— s390/vfio_ccw: Selectively expand io_mutex

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： s390/vfio_ccw：选择性扩展 io_mutex 的保护范围 最初定义用于序列化 ，但由于 I/O 区域与 I/O 操作之间存在紧密关联，该互斥量也被间接用于同步 I/O 操作本身。 针对当前可能存在的若干竞态条件，有两种处理方案： A) 扩展 的保护范围，以覆盖剩余的竞态窗口；或 B) 将 的作用范围缩小至仅 ，并为剩余的 I/O 资源引入新的锁定机制。 本补丁采用方案 A，因为方案 B 会引入更多需要跟踪并维持正确层级关系的交互逻辑。此外，该补丁还利用了 中工作

CVSS 8.8 · High

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 4f76617378ee97c557b526cb58d3c61eb0a9c963< f72a51810d49411bd8cad0c2df8592320a2fe5cc affected
4f76617378ee97c557b526cb58d3c61eb0a9c963< 2ba9efdf9ebedc4e54df4b56aa3b43a65f7967cd affected
4f76617378ee97c557b526cb58d3c61eb0a9c963< b6aecea4b2b246f9fbd98a5712daa1193a60818e affected
4f76617378ee97c557b526cb58d3c61eb0a9c963< 2a5ac0c0f1f7da33929211a2e41911bf72ee35d8 affected
4f76617378ee97c557b526cb58d3c61eb0a9c963< 34f4feff3e90bd09308fad0974e97113b23b812a affected
5.2 affected
< 5.2 unaffected
6.6.153≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-80548

Vulnerability Information
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Vulnerability Title
s390/vfio_ccw: Selectively expand io_mutex
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Selectively expand io_mutex The io_mutex was defined to serialize the io_regions, but then has also sort of been associated with the I/O themselves because of the close relationship they share. With the handful of races that are possible, the choices are either to: A) expand the scope of io_mutex to close these remaining windows, or B) reduce the scope of io_mutex to just io_region, and introduce a new lock mechanism for the remaining I/O resources This patch implements A, since B brings with it a lot more interactions that would need to be tracked and kept in a correct hierarchy. It also takes advantage of the workqueue element for cp_free() that now gets called out of fsm_notoper(), which could be invoked out of an interrupt context and thus cannot acquire a mutex itself.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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 4f76617378ee97c557b526cb58d3c61eb0a9c963 ~ f72a51810d49411bd8cad0c2df8592320a2fe5cc -
Linux Linux 5.2 -

II. Public POCs for CVE-2026-80548

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III. Intelligence Information for CVE-2026-80548

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Patches & Fixes for CVE-2026-80548 (4)

Other References for CVE-2026-80548 (1)

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

CVE-2026-80519 9.8 CRITICAL ovpn: finish crypto callback cleanup before peer release
CVE-2026-80586 9.8 CRITICAL mptcp: options: reset DSS fields in case of unexpected size
CVE-2026-80587 9.8 CRITICAL mptcp: avoid combining some incoming suboptions
CVE-2026-80589 9.8 CRITICAL block: stop the timeout timer when releasing a never added disk
CVE-2026-74737 9.8 CRITICAL net: ethernet: ti: am65-cpsw-nuss: Fix port_id extraction from SRC TAG
CVE-2026-74743 9.8 CRITICAL macvlan: inherit needed_headroom and needed_tailroom from lowerdev
CVE-2026-74746 9.8 CRITICAL netfilter: flowtable: publish GC-visible tuple last
CVE-2026-80557 9.8 CRITICAL libceph: fix OOB read in decode_watchers() via missing bounds check
CVE-2026-80558 9.8 CRITICAL libceph: Avoid using invalid osd indices from primary_temp
CVE-2026-80561 9.8 CRITICAL libceph: fix multiple unsafe decodes in decode_locker()
CVE-2026-80528 9.8 CRITICAL ceph: avoid fs reclaim while using current->journal_info
CVE-2026-74752 9.8 CRITICAL sctp: validate cookie AUTH state before use
CVE-2026-74744 9.8 CRITICAL ipvlan: inherit needed_headroom and needed_tailroom from phy_dev
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-2026-80552 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
CVE-2026-80547 8.8 HIGH s390/vfio_ccw: Implement a crw lock

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-2026-80548

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