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ReviewHigh

CVE-2026-80555

Linux

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 be...

CVSS
7.1
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.08.27
PRIORITY ASSESSMENT

Review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.1

Vulnerability overview

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 be...

Affected product and versions

Product
Linux
Affected versions
>= 8b515be512a2435bb8aedc6390cbe140167f9eb9 < 276bd7ed34d56c48c65c43c0b08f2ee77029b2fa, >= 8b515be512a2435bb8aedc6390cbe140167f9eb9 < f9bcff265556796834122f95de16d52a8375206c, >= 8b515be512a2435bb8aedc6390cbe140167f9eb9 < 17e01e342af74de12899c206dcc9ec90684703aa, >= 8b515be512a2435bb8aedc6390cbe140167f9eb9 < 152fcb74a26804b70909381c6acc90595a0ae1c1, >= 8b515be512a2435bb8aedc6390cbe140167f9eb9 < 6a917199aaf97904f5619afe3dfdacb155b03e8c, >= 8b515be512a2435bb8aedc6390cbe140167f9eb9 < 32e3d364a7b8295120d37e6a6bd433d2de26f748, >= 8b515be512a2435bb8aedc6390cbe140167f9eb9 < 4699b54fada156534cbb39834d47fc9374d7a1f5, >= 8b515be512a2435bb8aedc6390cbe140167f9eb9 < 74186c2968f8f756ac3226b545b598457c910c75, >= 5.3
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE
Not available