7.1

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

Received
AliasesUBUNTU-CVE-2026-80555DEBIAN-CVE-2026-80555
Published 26-08-2026Last modified 27-08-2026

Vulnerability summary

CVE-2026-80555 is a high (CVSS 7.1) vulnerability in linux. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 3.2% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.1, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.14%
0%100%
Low · -0.05 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 8 · Related 1
MGASA-2026-0506MGASA-2026-0542USN-8886-1USN-8959-1USN-8960-1USN-8961-1

Timeline

  1. 26-08-2026
    PublishedVulnerability first disclosed.
  2. 27-08-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

Decrease -0.05 pp

From 0.19% on 06-10-2026

06-10-202605-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu165 products
  • linuxAll versions (No fix recorded) | < 5.15.0-202.212 | < 7.0.0-42.42
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1119.126 | < 7.0.0-1016.17
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.187-1 | < 6.12.105-1 | < 7.1.10-1
  • linux-6.12< 6.12.107-1~deb12u1
Linux1 product
  • linux≥ 8b515be512a2435bb8aedc6390cbe140167f9eb9, < 276bd7ed34d56c48c65c43c0b08f2ee77029b2fa | ≥ 8b515be512a2435bb8aedc6390cbe140167f9eb9, < f9bcff265556796834122f95de16d52a8375206c | ≥ 8b515be512a2435bb8aedc6390cbe140167f9eb9, < 17e01e342af74de12899c206dcc9ec90684703aa | ≥ 8b515be512a2435bb8aedc6390cbe140167f9eb9, < 152fcb74a26804b70909381c6acc90595a0ae1c1 | ≥ 8b515be512a2435bb8aedc6390cbe140167f9eb9, < 6a917199aaf97904f5619afe3dfdacb155b03e8c | ≥ 8b515be512a2435bb8aedc6390cbe140167f9eb9, < 32e3d364a7b8295120d37e6a6bd433d2de26f748 | ≥ 8b515be512a2435bb8aedc6390cbe140167f9eb9, < 4699b54fada156534cbb39834d47fc9374d7a1f5 | ≥ 8b515be512a2435bb8aedc6390cbe140167f9eb9, < 74186c2968f8f756ac3226b545b598457c910c75 | 5.3

3 vendors · 168 products

References

17 links
Show all 17 references