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CVE-2026-80555— s390/vfio_ccw: Free all memory if cp_init() fails

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中cp_init()失败时未能释放所有内存，导致内存泄漏，可能造成拒绝服务。

CVSS 7.1 · High EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1600 · Weaken Encryption

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 8b515be512a2435bb8aedc6390cbe140167f9eb9< 276bd7ed34d56c48c65c43c0b08f2ee77029b2fa affected
8b515be512a2435bb8aedc6390cbe140167f9eb9< f9bcff265556796834122f95de16d52a8375206c affected
8b515be512a2435bb8aedc6390cbe140167f9eb9< 17e01e342af74de12899c206dcc9ec90684703aa affected
8b515be512a2435bb8aedc6390cbe140167f9eb9< 152fcb74a26804b70909381c6acc90595a0ae1c1 affected
8b515be512a2435bb8aedc6390cbe140167f9eb9< 6a917199aaf97904f5619afe3dfdacb155b03e8c affected
8b515be512a2435bb8aedc6390cbe140167f9eb9< 32e3d364a7b8295120d37e6a6bd433d2de26f748 affected
8b515be512a2435bb8aedc6390cbe140167f9eb9< 4699b54fada156534cbb39834d47fc9374d7a1f5 affected
8b515be512a2435bb8aedc6390cbe140167f9eb9< 74186c2968f8f756ac3226b545b598457c910c75 affected
… +10 more rows
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I. Basic Information for CVE-2026-80555

Vulnerability Information
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Vulnerability Title
s390/vfio_ccw: Free all memory if cp_init() fails
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Free all memory if cp_init() fails The routine cp_free() is called to unpin/free any memory once an I/O is completed successfully, or if cp_prefetch() fails. But if cp_init() fails, and cp->initialized is not enabled, the same routine cannot be used to free all the memory. An attempt to address this exists in ccwchain_handle_ccw(), where a single call to ccwchain_free() is made for the currently-processed CCW segment. But this will leak other segments (created as a result of a Transfer in Channel) that had been allocated as part of the same channel program. Address this by performing the cleanup outside of the recursive ccwchain_handle_ccw()/ccwchain_loop_tic() logic.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/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中cp_init()失败时未能释放所有内存，导致内存泄漏，可能造成拒绝服务。
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 8b515be512a2435bb8aedc6390cbe140167f9eb9 ~ 276bd7ed34d56c48c65c43c0b08f2ee77029b2fa -
Linux Linux 5.3 -

II. Public POCs for CVE-2026-80555

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III. Intelligence Information for CVE-2026-80555

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Patches & Fixes for CVE-2026-80555 (4)

Other References for CVE-2026-80555 (4)

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

V. Comments for CVE-2026-80555

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