s390/vfio_ccw: Selectively expand io_mutex
Summary
| CVE | CVE-2026-80548 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-08-26 15:17:09 UTC |
| Updated | 2026-08-27 06:17:36 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 8.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | Secondary | 8.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| 3.1 | CNA | DECLARED | 8.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
ChangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 4f76617378ee97c557b526cb58d3c61eb0a9c963 f72a51810d49411bd8cad0c2df8592320a2fe5cc git | Not specified |
| CNA | Linux | Linux | affected 4f76617378ee97c557b526cb58d3c61eb0a9c963 2ba9efdf9ebedc4e54df4b56aa3b43a65f7967cd git | Not specified |
| CNA | Linux | Linux | affected 4f76617378ee97c557b526cb58d3c61eb0a9c963 b6aecea4b2b246f9fbd98a5712daa1193a60818e git | Not specified |
| CNA | Linux | Linux | affected 4f76617378ee97c557b526cb58d3c61eb0a9c963 2a5ac0c0f1f7da33929211a2e41911bf72ee35d8 git | Not specified |
| CNA | Linux | Linux | affected 4f76617378ee97c557b526cb58d3c61eb0a9c963 34f4feff3e90bd09308fad0974e97113b23b812a git | Not specified |
| CNA | Linux | Linux | affected 5.2 | Not specified |
| CNA | Linux | Linux | unaffected 5.2 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.153 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.105 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.46 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1.10 7.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/34f4feff3e90bd09308fad0974e97113b23b812a | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/b6aecea4b2b246f9fbd98a5712daa1193a60818e | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/f72a51810d49411bd8cad0c2df8592320a2fe5cc | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/2a5ac0c0f1f7da33929211a2e41911bf72ee35d8 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/2ba9efdf9ebedc4e54df4b56aa3b43a65f7967cd | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.