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CVE-2026-80550— s390/vfio_ccw: Fix out of bounds check on CCW array

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：修复 CCW 数组的越界检查问题 函数 用于统计单个通道程序中链接在一起的所有通道命令字（CCW）的数量，并拒绝超过 （即 256）个 CCW 的链路。 该函数中的循环结构为 。虽然 中的逻辑正确地处理了从 0 开始索引的 CCW 数组与从 1 开始计数的 CCW 数量之间的转换，但在结束循环并（正确地）返回错误之前，该逻辑仍会检查可能的第 257 个 CCW。 修复方式：重构该循环，使其在检查完前 256 个 CCW（即索引 0–255）后立即

CVSS 7.9 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 2 AI

T1261 T1069.001 · Local Groups

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 0a19e61e6d4c6192077ead760ba0a2d350987d4c< 0282fb1c4b638eecfe2cc558092c460911d8f7e2 affected
0a19e61e6d4c6192077ead760ba0a2d350987d4c< 907adc667d902fafbdb2d740d57b55bd025dc4cd affected
0a19e61e6d4c6192077ead760ba0a2d350987d4c< f20be33d093ce7630c17ff7ed93caf7eaf8ac1a3 affected
0a19e61e6d4c6192077ead760ba0a2d350987d4c< af3f80ca4c8b17f20f9e588def076288fdb49e65 affected
0a19e61e6d4c6192077ead760ba0a2d350987d4c< 499a8a66b1598bfab97182aed15e0f1646074a3d affected
0a19e61e6d4c6192077ead760ba0a2d350987d4c< 4c2e1d359d7a2b82cdf3254e4e480af9417f99fb affected
0a19e61e6d4c6192077ead760ba0a2d350987d4c< d5d096cd9369e986d4e5153baa86b8b35c283e09 affected
0a19e61e6d4c6192077ead760ba0a2d350987d4c< a005b7f1a491ffda61bff0fd0f6548f8986fb977 affected
… +10 more rows
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I. Basic Information for CVE-2026-80550

Vulnerability Information
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Vulnerability Title
s390/vfio_ccw: Fix out of bounds check on CCW array
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Fix out of bounds check on CCW array The routine ccwchain_calc_length() counts the number of channel command words (CCWs) that are chained together in a single channel program, and rejects anything larger than CCWCHAIN_LEN_MAX (256) CCWs. The loop itself is "do..while (count < 257)", and while the logic in is_cpa_within_range() correctly adjusts between the 0-index array of CCWs and the count of CCWs starting at 1, this means it would look at a possible 257th CCW before ending the loop and (correctly) returning an error. Fix this by restructuring the loop to break as soon as 256 CCWs (thus indexes 0-255) are examined, without looking at memory outside the range.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L
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 ~ 0282fb1c4b638eecfe2cc558092c460911d8f7e2 -
Linux Linux 4.12 -

II. Public POCs for CVE-2026-80550

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III. Intelligence Information for CVE-2026-80550

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Patches & Fixes for CVE-2026-80550 (7)

Vendor Advisories for CVE-2026-80550 (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-2026-74743 9.8 CRITICAL macvlan: inherit needed_headroom and needed_tailroom from lowerdev
CVE-2026-74737 9.8 CRITICAL net: ethernet: ti: am65-cpsw-nuss: Fix port_id extraction from SRC TAG
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-2026-74744 9.8 CRITICAL ipvlan: inherit needed_headroom and needed_tailroom from phy_dev
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-2026-80589 9.8 CRITICAL block: stop the timeout timer when releasing a never added disk
CVE-2026-74751 9.4 CRITICAL riscv: lib: Fix ZBB strnlen reading past count boundary
CVE-2026-80585 9.4 CRITICAL mptcp: fastopen: only mark MPTFO subflows with SYN data
CVE-2026-80551 9.3 CRITICAL s390/vfio_ccw: Ensure first IDAW remains constant
CVE-2026-80554 9.3 CRITICAL s390/vfio_ccw: Limit the number of channel program segments
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-2026-80576 8.8 HIGH drm/amdgpu: reject oversized IBs with per-ring packet limits

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

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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