CVE-2026-80548High· 8.8▾ TwilightIn 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 beca…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 48.4 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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.
Linux >= 4f76617378ee97c557b526cb58d3c61eb0a9c963 < dab6a6627b0b0cce23653e99c7b0bf8c6cfd82e0Linux >= 4f76617378ee97c557b526cb58d3c61eb0a9c963 < 56d7488533ceac4e986e96e15c9e487a2245bc01Linux >= 4f76617378ee97c557b526cb58d3c61eb0a9c963 < f72a51810d49411bd8cad0c2df8592320a2fe5ccLinux >= 4f76617378ee97c557b526cb58d3c61eb0a9c963 < 2ba9efdf9ebedc4e54df4b56aa3b43a65f7967cdLinux >= 4f76617378ee97c557b526cb58d3c61eb0a9c963 < b6aecea4b2b246f9fbd98a5712daa1193a60818eLinux >= 4f76617378ee97c557b526cb58d3c61eb0a9c963 < 2a5ac0c0f1f7da33929211a2e41911bf72ee35d8Linux >= 4f76617378ee97c557b526cb58d3c61eb0a9c963 < 34f4feff3e90bd09308fad0974e97113b23b812aLinux 5.2Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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