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CVE-2026-80554— s390/vfio_ccw: Limit the number of channel program segments

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，以下漏洞已得到修复： s390/vfio_ccw：限制通道程序段的数量 通道程序（channel program）及其内部通道字（CCW）的处理采用递归方式实现。因此，单个通道程序中可存在的 CCW 数量存在一个任意（但非架构层面）的上限。 vfio-ccw 逻辑在遇到“传输入通道”（TIC）CCW 时，会将通道程序拆分为多个段（segments），而这些段的总数会计入全局限制。在将该逻辑改造为非递归实现之前，需对段的数量施加相应的上限限制。

CVSS 9.3 · Critical EPSS 0.20% · P9

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 0a19e61e6d4c6192077ead760ba0a2d350987d4c< 15fb4559a7fdf0b8725e433a71cfd03a1313a48b affected
0a19e61e6d4c6192077ead760ba0a2d350987d4c< a1625f66eaa1200068a0e2c05bc90e65182fc4e3 affected
0a19e61e6d4c6192077ead760ba0a2d350987d4c< 06f4d6e5a8af6c2072e8cd39dbc512c683ca7fb2 affected
0a19e61e6d4c6192077ead760ba0a2d350987d4c< 4ee94790490ae8dcc97df8597f07836c8a81bbcf affected
0a19e61e6d4c6192077ead760ba0a2d350987d4c< 5405c90d6a47b3014e74ee0618a162449abbbc93 affected
4.12 affected
< 4.12 unaffected
6.6.153≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2026-80554

Vulnerability Information
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Vulnerability Title
s390/vfio_ccw: Limit the number of channel program segments
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Limit the number of channel program segments The processing of channel programs, and the CCWs within them, is done recursively. As such, there is an arbitrary (but not architectural) limit to the number of CCWs that can exist in a single channel program. The vfio-ccw logic breaks these channel programs into segments whenever it encounters a Transfer-In-Channel (TIC) CCW, and the combined number of segments count towards the global limit. Impose an equivalent limit to the number of segments until such logic can be made non-recursive.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 0a19e61e6d4c6192077ead760ba0a2d350987d4c ~ 15fb4559a7fdf0b8725e433a71cfd03a1313a48b -
Linux Linux 4.12 -

II. Public POCs for CVE-2026-80554

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III. Intelligence Information for CVE-2026-80554

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Patches & Fixes for CVE-2026-80554 (5)

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-2026-80586 9.8 CRITICAL mptcp: options: reset DSS fields in case of unexpected size
CVE-2026-80558 9.8 CRITICAL libceph: Avoid using invalid osd indices from primary_temp
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-2026-80557 9.8 CRITICAL libceph: fix OOB read in decode_watchers() via missing bounds check
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-2026-80551 9.3 CRITICAL s390/vfio_ccw: Ensure first IDAW remains constant
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-2026-80554

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