{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-80548", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.766Z", "datePublished": "2026-08-26T14:37:18.759Z", "dateUpdated": "2026-08-26T14:37:18.759Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-26T14:37:18.759Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/vfio_ccw: Selectively expand io_mutex\n\nThe io_mutex was defined to serialize the io_regions, but then has\nalso sort of been associated with the I/O themselves because of\nthe close relationship they share.\n\nWith the handful of races that are possible, the choices are either to:\n A) expand the scope of io_mutex to close these remaining windows, or\n B) reduce the scope of io_mutex to just io_region, and introduce a new\n lock mechanism for the remaining I/O resources\n\nThis patch implements A, since B brings with it a lot more interactions\nthat would need to be tracked and kept in a correct hierarchy. It also\ntakes advantage of the workqueue element for cp_free() that now gets\ncalled out of fsm_notoper(), which could be invoked out of an interrupt\ncontext and thus cannot acquire a mutex itself."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.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"], "versions": [{"version": "4f76617378ee97c557b526cb58d3c61eb0a9c963", "lessThan": "f72a51810d49411bd8cad0c2df8592320a2fe5cc", "status": "affected", "versionType": "git"}, {"version": "4f76617378ee97c557b526cb58d3c61eb0a9c963", "lessThan": "2ba9efdf9ebedc4e54df4b56aa3b43a65f7967cd", "status": "affected", "versionType": "git"}, {"version": "4f76617378ee97c557b526cb58d3c61eb0a9c963", "lessThan": "b6aecea4b2b246f9fbd98a5712daa1193a60818e", "status": "affected", "versionType": "git"}, {"version": "4f76617378ee97c557b526cb58d3c61eb0a9c963", "lessThan": "2a5ac0c0f1f7da33929211a2e41911bf72ee35d8", "status": "affected", "versionType": "git"}, {"version": "4f76617378ee97c557b526cb58d3c61eb0a9c963", "lessThan": "34f4feff3e90bd09308fad0974e97113b23b812a", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.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"], "versions": [{"version": "5.2", "status": "affected"}, {"version": "0", "lessThan": "5.2", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.153", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.105", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.46", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.10", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.6.153"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.12.105"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "6.18.46"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "7.1.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/f72a51810d49411bd8cad0c2df8592320a2fe5cc"}, {"url": "https://git.kernel.org/stable/c/2ba9efdf9ebedc4e54df4b56aa3b43a65f7967cd"}, {"url": "https://git.kernel.org/stable/c/b6aecea4b2b246f9fbd98a5712daa1193a60818e"}, {"url": "https://git.kernel.org/stable/c/2a5ac0c0f1f7da33929211a2e41911bf72ee35d8"}, {"url": "https://git.kernel.org/stable/c/34f4feff3e90bd09308fad0974e97113b23b812a"}], "title": "s390/vfio_ccw: Selectively expand io_mutex", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{}

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