{"id":"CVE-2026-80547","state":"PUBLISHED","title":"s390/vfio_ccw: Implement a crw lock","description":"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.","publishedAt":"2026-08-26T14:37:18.159Z","updatedAt":"2026-10-16T19:26:25.722Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"3f02cb2fd9d2d9e8762102886e3e4b51285797ee","status":"affected","lessThan":"3c94d4179bcc19e01b28db634c07a58b28116209","versionType":"git"},{"version":"3f02cb2fd9d2d9e8762102886e3e4b51285797ee","status":"affected","lessThan":"0edd222730a9d7ec98368aaf1d40ee2d8d862e61","versionType":"git"},{"version":"3f02cb2fd9d2d9e8762102886e3e4b51285797ee","status":"affected","lessThan":"a3d60ae24183eee352c8e87a0ff94c97cd87f156","versionType":"git"},{"version":"3f02cb2fd9d2d9e8762102886e3e4b51285797ee","status":"affected","lessThan":"49fa26b0df009dc1f420980bd71780e70615b83b","versionType":"git"},{"version":"3f02cb2fd9d2d9e8762102886e3e4b51285797ee","status":"affected","lessThan":"7902be374cbfc11c3435e1e87bf22195bf06a558","versionType":"git"},{"version":"3f02cb2fd9d2d9e8762102886e3e4b51285797ee","status":"affected","lessThan":"c76c4ee72bfc3824f4f491f18ed0323bf2e2daf9","versionType":"git"},{"version":"3f02cb2fd9d2d9e8762102886e3e4b51285797ee","status":"affected","lessThan":"16b0798024c0e9117e395829ddbbe70981c79d9c","versionType":"git"}],"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"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.8","versionType":"semver"},{"version":"5.15.218","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.185","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.154","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.105","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.46","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.10","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"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"]}],"references":["https://git.kernel.org/stable/c/3c94d4179bcc19e01b28db634c07a58b28116209","https://git.kernel.org/stable/c/0edd222730a9d7ec98368aaf1d40ee2d8d862e61","https://git.kernel.org/stable/c/a3d60ae24183eee352c8e87a0ff94c97cd87f156","https://git.kernel.org/stable/c/49fa26b0df009dc1f420980bd71780e70615b83b","https://git.kernel.org/stable/c/7902be374cbfc11c3435e1e87bf22195bf06a558","https://git.kernel.org/stable/c/c76c4ee72bfc3824f4f491f18ed0323bf2e2daf9","https://git.kernel.org/stable/c/16b0798024c0e9117e395829ddbbe70981c79d9c"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/80xxx/CVE-2026-80547.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80547","state":"PUBLISHED","datePublished":"2026-08-26T14:37:18.159Z","dateUpdated":"2026-10-16T19:26:25.722Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-26T14:34:25.766Z"},"containers":{"cna":{"title":"s390/vfio_ccw: Implement a crw lock","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 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- 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 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