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CVE-2026-80551— s390/vfio_ccw: Ensure first IDAW remains constant

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子系统中第一个IDAW地址在两次读取之间未验证是否保持不变，可能导致TOCTOU问题，进而导致内存破坏、信息泄露或拒绝服务。

CVSS 9.3 · Critical EPSS 0.20% · P9

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 01aa26c672c0eb771de4aaa2a8ccf6055778887b< 460b977a4e71cc319fdadf91c193ec3beaa57263 affected
01aa26c672c0eb771de4aaa2a8ccf6055778887b< 0d46c2565f173bcddcdcaf44a4f69789a20535e2 affected
01aa26c672c0eb771de4aaa2a8ccf6055778887b< 08ef2a82115690d6e229615872ac1731af732497 affected
01aa26c672c0eb771de4aaa2a8ccf6055778887b< fc59e9482117ebdccd6dc7fa8082f8b980fd021e affected
01aa26c672c0eb771de4aaa2a8ccf6055778887b< 565bef268d75bf7df665bce6923a88cd0eb74592 affected
5.3 affected
< 5.3 unaffected
6.6.154≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-80551

Vulnerability Information
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Vulnerability Title
s390/vfio_ccw: Ensure first IDAW remains constant
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Ensure first IDAW remains constant The first IDAW in a list does not need to be on a 2K/4K boundary like all others, and so is read separately to accurately calculate the size of the buffer needed to read the full IDAL. Verify that the address found in the first IDAW is unchanged between reads, to ensure a consistent set of IDAWs being worked with.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/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子系统中第一个IDAW地址在两次读取之间未验证是否保持不变，可能导致TOCTOU问题，进而导致内存破坏、信息泄露或拒绝服务。
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 01aa26c672c0eb771de4aaa2a8ccf6055778887b ~ 460b977a4e71cc319fdadf91c193ec3beaa57263 -
Linux Linux 5.3 -

II. Public POCs for CVE-2026-80551

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III. Intelligence Information for CVE-2026-80551

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Patches & Fixes for CVE-2026-80551 (4)

Other References for CVE-2026-80551 (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-2026-80576 8.8 HIGH drm/amdgpu: reject oversized IBs with per-ring packet limits
CVE-2026-80553 8.8 HIGH s390/vfio_ccw: Cancel existing workqueues
CVE-2026-80552 8.8 HIGH s390/vfio_ccw: Ensure index for read/write regions are within range
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-2026-80551

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