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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.

在 Linux 内核中，以下漏洞已得到修复： s390/vfio_ccw：当 cp_init() 失败时，释放所有内存 例程在 I/O 成功完成或 失败时被调用，用于解钉（unpin）并释放内存。但如果 失败且 未被置位，则无法使用同一个例程来释放所有内存。 目前代码中已有一处尝试来处理这一问题：在 中，会对当前正在处理的 CCW 段调用一次 。但这只会释放当前段，而其他段（因通道中的 Transfer 操作而创建）是在同一个通道程序中被分配的，它们仍然存在内存泄漏。 修复方式是：在递归的 / 逻辑之外执行清理操作

AI Predicted 5.5 Difficulty: Hard

Possible ATT&CK Techniques 1 AI

T1600 · Weaken Encryption

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 8b515be512a2435bb8aedc6390cbe140167f9eb9< 6a917199aaf97904f5619afe3dfdacb155b03e8c affected
8b515be512a2435bb8aedc6390cbe140167f9eb9< 32e3d364a7b8295120d37e6a6bd433d2de26f748 affected
8b515be512a2435bb8aedc6390cbe140167f9eb9< 4699b54fada156534cbb39834d47fc9374d7a1f5 affected
8b515be512a2435bb8aedc6390cbe140167f9eb9< 74186c2968f8f756ac3226b545b598457c910c75 affected
5.3 affected
< 5.3 unaffected
6.12.105≤ 6.12.* unaffected
6.18.46≤ 6.18.* unaffected
… +2 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
N/A
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 8b515be512a2435bb8aedc6390cbe140167f9eb9 ~ 6a917199aaf97904f5619afe3dfdacb155b03e8c -
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)

Same Patch Batch · Linux · 2026-08-26 · 92 CVEs total

CVE-2026-80556 mmc: atmel-mci: Fix use-after-free in atmci_remove due to race condition
CVE-2026-80553 s390/vfio_ccw: Cancel existing workqueues
CVE-2026-80552 s390/vfio_ccw: Ensure index for read/write regions are within range
CVE-2026-80549 s390/vfio_ccw: Move cp cleanup out of not operational
CVE-2026-80546 s390/zcrypt: Improve CCA CPRB length and overflow checks
CVE-2026-80547 s390/vfio_ccw: Implement a crw lock
CVE-2026-80545 s390/zcrypt: Improve EP11 CPRB length and overflow checks
CVE-2026-80543 s390/zcrypt: Pad trailing CCA or EP11 message with zeros
CVE-2026-80548 s390/vfio_ccw: Selectively expand io_mutex
CVE-2026-80557 libceph: fix OOB read in decode_watchers() via missing bounds check
CVE-2026-80554 s390/vfio_ccw: Limit the number of channel program segments
CVE-2026-80559 Input: sur40 - fix input device registration ordering
CVE-2026-80558 libceph: Avoid using invalid osd indices from primary_temp
CVE-2026-80560 openrisc: signal: do not restore privileged SR bits on sigreturn
CVE-2026-80561 libceph: fix multiple unsafe decodes in decode_locker()
CVE-2026-80562 gpio: ml-ioh: use raw_spinlock_t for the register lock
CVE-2026-80563 gpio: sloppy-logic-analyzer: fix use-after-free via debugfs trigger on unbind
CVE-2026-80564 gve: fix NULL dereference due to missing ptp adjfine
CVE-2026-80565 crypto: qce - fix error path in devm_qce_register_algs
CVE-2026-80566 Input: hynitron_cstxxx - validate touch count and finger IDs

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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