8.8

CVE-2026-80548: s390/vfio_ccw: Selectively expand io_mutex

Received
AliasesUBUNTU-CVE-2026-80548DEBIAN-CVE-2026-80548
Published 26-08-2026Last modified 16-10-2026

Vulnerability summary

CVE-2026-80548 is a high (CVSS 8.8) vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.5% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 8.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.13%
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. 16-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Selectively expand io_mutex The io_mutex was defined to serialize the io_regions, but then has also sort of been associated with the I/O themselves because of the close relationship they share. With the handful of races that are possible, the choices are either to: A) expand the scope of io_mutex to close these remaining windows, or B) reduce the scope of io_mutex to just io_region, and introduce a new lock mechanism for the remaining I/O resources This patch implements A, since B brings with it a lot more interactions that would need to be tracked and kept in a correct hierarchy. It also takes advantage of the workqueue element for cp_free() that now gets called out of fsm_notoper(), which could be invoked out of an interrupt context and thus cannot acquire a mutex itself.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

Decrease -0.05 pp

From 0.18% 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, low-privilege account, 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≥ 4f76617378ee97c557b526cb58d3c61eb0a9c963, < dab6a6627b0b0cce23653e99c7b0bf8c6cfd82e0 | ≥ 4f76617378ee97c557b526cb58d3c61eb0a9c963, < 56d7488533ceac4e986e96e15c9e487a2245bc01 | ≥ 4f76617378ee97c557b526cb58d3c61eb0a9c963, < f72a51810d49411bd8cad0c2df8592320a2fe5cc | ≥ 4f76617378ee97c557b526cb58d3c61eb0a9c963, < 2ba9efdf9ebedc4e54df4b56aa3b43a65f7967cd | ≥ 4f76617378ee97c557b526cb58d3c61eb0a9c963, < b6aecea4b2b246f9fbd98a5712daa1193a60818e | ≥ 4f76617378ee97c557b526cb58d3c61eb0a9c963, < 2a5ac0c0f1f7da33929211a2e41911bf72ee35d8 | ≥ 4f76617378ee97c557b526cb58d3c61eb0a9c963, < 34f4feff3e90bd09308fad0974e97113b23b812a | 5.2

3 vendors · 168 products

References

15 links
Show all 15 references