{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-80547", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.766Z", "datePublished": "2026-08-26T14:37:18.159Z", "dateUpdated": "2026-10-16T19:26:25.722Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-27T12:40:07.162Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/vfio_ccw: Implement a crw lock\n\nUnlike the channel_program struct, which covers synchronous I/O\nsubmissions and asynchronous interrupts, the CRW region relies\nexclusively on asynchronous events coming from hardware.\n\nImplement a lock to manage the list of those payloads, to ensure\nthey are read cohesively." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The flaw is reached only via local VFIO mediated-device access (read/ioctl on /dev/vfio/* device fds) to the CCW CRW region; vfio-ccw has no network, Bluetooth, or physical-bus packet entry point.\nAC:L - The attacker controls CRW region reads and can retry concurrently while channel-path events queue CRWs via vfio_ccw_chp_event(); this user-versus-hardware/workqueue list race is winnable without conditions outside attacker influence.\nPR:L - Triggering requires an opened vfio-ccw mdev fd (typical QEMU/libvirt VM operator or delegated /dev/vfio holder on IBM Z passthrough hosts), not init-namespace root; admin creates the mdev but exploitation needs only that VFIO client access.\nUI:N - No separate victim action is required; once vfio-ccw passthrough is configured, the attacker repeatedly reads the CRW region while guest/channel I/O generates asynchronous path events without needing another user to interact.\nS:C - On IBM Z/LinuxONE, vfio-ccw passes DASD subchannels into KVM guests; guest-driven channel activity causes host-side CRW queuing while the VFIO client reads the CRW region, corrupting hypervisor kernel memory outside the VM security boundary.\nC:H - Unsynchronized list_del/list_add/kfree on kmalloc vfio_ccw_crw objects is a use-after-free/list-corruption primitive; per kernel guidance this enables attacker-influenced heap reuse and arbitrary kernel memory disclosure.\nI:H - Corrupted list pointers and freed CRW entries allow heap-sprayable arbitrary writes and control-flow hijack beyond a simple crash, matching kernel guidance for use-after-free and memory corruption bugs.\nA:H - Concurrent unsynchronized list manipulation can immediately oops or panic the host kernel via invalid list operations or double-free, and successful exploitation can hang or crash the entire system." } ] } ], "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_drv.c", "drivers/s390/cio/vfio_ccw_ops.c", "drivers/s390/cio/vfio_ccw_private.h" ], "versions": [ { "version": "3f02cb2fd9d2d9e8762102886e3e4b51285797ee", "lessThan": "3c94d4179bcc19e01b28db634c07a58b28116209", "status": "affected", "versionType": "git" }, { "version": "3f02cb2fd9d2d9e8762102886e3e4b51285797ee", "lessThan": "0edd222730a9d7ec98368aaf1d40ee2d8d862e61", "status": "affected", "versionType": "git" }, { "version": "3f02cb2fd9d2d9e8762102886e3e4b51285797ee", "lessThan": "a3d60ae24183eee352c8e87a0ff94c97cd87f156", "status": "affected", "versionType": "git" }, { "version": "3f02cb2fd9d2d9e8762102886e3e4b51285797ee", "lessThan": "49fa26b0df009dc1f420980bd71780e70615b83b", "status": "affected", "versionType": "git" }, { "version": "3f02cb2fd9d2d9e8762102886e3e4b51285797ee", "lessThan": "7902be374cbfc11c3435e1e87bf22195bf06a558", "status": "affected", "versionType": "git" }, { "version": "3f02cb2fd9d2d9e8762102886e3e4b51285797ee", "lessThan": "c76c4ee72bfc3824f4f491f18ed0323bf2e2daf9", "status": "affected", "versionType": "git" }, { "version": "3f02cb2fd9d2d9e8762102886e3e4b51285797ee", "lessThan": "16b0798024c0e9117e395829ddbbe70981c79d9c", "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_drv.c", "drivers/s390/cio/vfio_ccw_ops.c", "drivers/s390/cio/vfio_ccw_private.h" ], "versions": [ { "version": "5.8", "status": "affected" }, { "version": "0", "lessThan": "5.8", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.218", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.185", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.154", "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": "5.8", "versionEndExcluding": "5.15.218" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.1.185" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.6.154" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.12.105" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.18.46" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "7.1.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/3c94d4179bcc19e01b28db634c07a58b28116209" }, { "url": "https://git.kernel.org/stable/c/0edd222730a9d7ec98368aaf1d40ee2d8d862e61" }, { "url": "https://git.kernel.org/stable/c/a3d60ae24183eee352c8e87a0ff94c97cd87f156" }, { "url": "https://git.kernel.org/stable/c/49fa26b0df009dc1f420980bd71780e70615b83b" }, { "url": "https://git.kernel.org/stable/c/7902be374cbfc11c3435e1e87bf22195bf06a558" }, { "url": "https://git.kernel.org/stable/c/c76c4ee72bfc3824f4f491f18ed0323bf2e2daf9" }, { "url": "https://git.kernel.org/stable/c/16b0798024c0e9117e395829ddbbe70981c79d9c" } ], "title": "s390/vfio_ccw: Implement a crw lock", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-80547", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T19:16:58.374900Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": 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