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CVE-2026-80552— s390/vfio_ccw: Ensure index for read/write regions are within range

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基金会开源的一个操作系统内核。 Linux kernel 存在安全漏洞，该漏洞源于s390/vfio_ccw驱动在引入能力链时对既有读/写区域索引未进行范围限制，导致越界访问，可能造成内核信息泄露、任意写或权限提升。

CVSS 8.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux db8e5d17ac03a65e2e0ee0ba50bf61a99741d871< 3acbedf5c0b8e0971f0de423c05cc02bbf6ddb99 affected
db8e5d17ac03a65e2e0ee0ba50bf61a99741d871< d3b1e38404b22df5a1f93019f2bb656feaad5ae3 affected
db8e5d17ac03a65e2e0ee0ba50bf61a99741d871< 79ea5e0c4c8a9842ae85f45062d947b3297dfc07 affected
db8e5d17ac03a65e2e0ee0ba50bf61a99741d871< d597fa1273802941c7801202135976fecc29672b affected
db8e5d17ac03a65e2e0ee0ba50bf61a99741d871< 649badf3a2fd8929e40198603a2cb21b74c21700 affected
db8e5d17ac03a65e2e0ee0ba50bf61a99741d871< 988d9b5be3c2c4baf9457ce8e11b477e13eb9fcf affected
db8e5d17ac03a65e2e0ee0ba50bf61a99741d871< 9f5f9a78fedc45bc29d6a0a64e3a3472361afae5 affected
5.2 affected
… +8 more rows
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I. Basic Information for CVE-2026-80552

Vulnerability Information
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Vulnerability Title
s390/vfio_ccw: Ensure index for read/write regions are within range
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Ensure index for read/write regions are within range The introduction of the capability chain rightly clamped the region indexes to the range of the capabilities itself, but neglected to do so for the existing read/write regions which should also be enforced.
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
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 存在安全漏洞，该漏洞源于s390/vfio_ccw驱动在引入能力链时对既有读/写区域索引未进行范围限制，导致越界访问，可能造成内核信息泄露、任意写或权限提升。
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 db8e5d17ac03a65e2e0ee0ba50bf61a99741d871 ~ 3acbedf5c0b8e0971f0de423c05cc02bbf6ddb99 -
Linux Linux 5.2 -

II. Public POCs for CVE-2026-80552

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III. Intelligence Information for CVE-2026-80552

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Patches & Fixes for CVE-2026-80552 (5)

Other References for CVE-2026-80552 (2)

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-2026-80548 8.8 HIGH s390/vfio_ccw: Selectively expand io_mutex
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-2026-80552

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