{"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":"2026-08-27T12:40:07.162Z"},"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"}}}}