s390/vfio_ccw: Selectively expand io_mutex
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.
CVE-2026-80548
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-80548
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4f76617378ee97c557b526cb58d3c61eb0a9c963",
"lessThan": "dab6a6627b0b0cce23653e99c7b0bf8c6cfd82e0",
"versionType": "git"
},
{
"status": "affected",
"version": "4f76617378ee97c557b526cb58d3c61eb0a9c963",
"lessThan": "56d7488533ceac4e986e96e15c9e487a2245bc01",
"versionType": "git"
},
{
"status": "affected",
"version": "4f76617378ee97c557b526cb58d3c61eb0a9c963",
"lessThan": "f72a51810d49411bd8cad0c2df8592320a2fe5cc",
"versionType": "git"
},
{
"status": "affected",
"version": "4f76617378ee97c557b526cb58d3c61eb0a9c963",
"lessThan": "2ba9efdf9ebedc4e54df4b56aa3b43a65f7967cd",
"versionType": "git"
},
{
"status": "affected",
"version": "4f76617378ee97c557b526cb58d3c61eb0a9c963",
"lessThan": "b6aecea4b2b246f9fbd98a5712daa1193a60818e",
"versionType": "git"
},
{
"status": "affected",
"version": "4f76617378ee97c557b526cb58d3c61eb0a9c963",
"lessThan": "2a5ac0c0f1f7da33929211a2e41911bf72ee35d8",
"versionType": "git"
},
{
"status": "affected",
"version": "4f76617378ee97c557b526cb58d3c61eb0a9c963",
"lessThan": "34f4feff3e90bd09308fad0974e97113b23b812a",
"versionType": "git"
}
],
"programFiles": [
"drivers/s390/cio/vfio_ccw_chp.c",
"drivers/s390/cio/vfio_ccw_cp.c",
"drivers/s390/cio/vfio_ccw_drv.c",
"drivers/s390/cio/vfio_ccw_fsm.c",
"drivers/s390/cio/vfio_ccw_private.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.2",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.218",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.185",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.153",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.105",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.46",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.10",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/s390/cio/vfio_ccw_chp.c",
"drivers/s390/cio/vfio_ccw_cp.c",
"drivers/s390/cio/vfio_ccw_drv.c",
"drivers/s390/cio/vfio_ccw_fsm.c",
"drivers/s390/cio/vfio_ccw_private.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80548
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #34317 · Revision 1
- Added to Heist Feed
- Publisher date