Answer in brief
CVE-2026-80548 records a High severity (CVSS 8.8) vulnerability in s390/vfio_ccw: Selectively expand io_mutex. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=4f76617378ee97c557b526cb58d3c61eb0a9c963 <f72a51810d49411bd8cad0c2df8592320a2fe5cc || >=4f76617378ee97c557b526cb58d3c61eb0a9c963 <2ba9efdf9ebedc4e54df4b56aa3b43a65f7967cd || >=4f76617378ee97c557b526cb58d3c61eb0a9c963 <b6aecea4b2b246f9fbd98a5712daa1193a60818e || >=4f76617378ee97c557b526cb58d3c61eb0a9c963 <2a5ac0c0f1f7da33929211a2e41911bf72ee35d8 || >=4f76617378ee97c557b526cb58d3c61eb0a9c963 <34f4feff3e90bd09308fad0974e97113b23b812a | f72a51810d49411bd8cad0c2df8592320a2fe5cc, 2ba9efdf9ebedc4e54df4b56aa3b43a65f7967cd, b6aecea4b2b246f9fbd98a5712daa1193a60818e, 2a5ac0c0f1f7da33929211a2e41911bf72ee35d8, 34f4feff3e90bd09308fad0974e97113b23b812a |
| Linux/Linuxgeneric | 5.2 | Not reported |
| Linux/Linuxgeneric | >=4f76617378ee97c557b526cb58d3c61eb0a9c963 <dab6a6627b0b0cce23653e99c7b0bf8c6cfd82e0 || >=4f76617378ee97c557b526cb58d3c61eb0a9c963 <56d7488533ceac4e986e96e15c9e487a2245bc01 || >=4f76617378ee97c557b526cb58d3c61eb0a9c963 <f72a51810d49411bd8cad0c2df8592320a2fe5cc || >=4f76617378ee97c557b526cb58d3c61eb0a9c963 <2ba9efdf9ebedc4e54df4b56aa3b43a65f7967cd || >=4f76617378ee97c557b526cb58d3c61eb0a9c963 <b6aecea4b2b246f9fbd98a5712daa1193a60818e || >=4f76617378ee97c557b526cb58d3c61eb0a9c963 <2a5ac0c0f1f7da33929211a2e41911bf72ee35d8 || >=4f76617378ee97c557b526cb58d3c61eb0a9c963 <34f4feff3e90bd09308fad0974e97113b23b812a | dab6a6627b0b0cce23653e99c7b0bf8c6cfd82e0, 56d7488533ceac4e986e96e15c9e487a2245bc01, f72a51810d49411bd8cad0c2df8592320a2fe5cc, 2ba9efdf9ebedc4e54df4b56aa3b43a65f7967cd, b6aecea4b2b246f9fbd98a5712daa1193a60818e, 2a5ac0c0f1f7da33929211a2e41911bf72ee35d8, 34f4feff3e90bd09308fad0974e97113b23b812a |
Published upstream
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 26, 2026
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.
Quoted source text, attributed separately from HOL analysis.