138 lines
7.3 KiB
JSON
138 lines
7.3 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-89919",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-11T19:38:34.775Z",
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"datePublished": "2026-09-16T10:32:14.013Z",
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"dateUpdated": "2026-10-19T08:54:53.667Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T08:54:53.667Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390: keyop: use mmu_lock to read gmap->asce\n\nEvery other dat_* consumer in this file (kvm_s390_get_skeys,\nset_skeys, get_cmma_bits, set_cmma_bits, MEM_CLR_CMMA,\nkvm_s390_fixup_prefix, kvm_test_age_gfn, kvm_age_gfn) reads\nkvm->arch.gmap->asce *inside* the mmu_lock read-side. keyop is the only\noutlier.\n\ngmap->asce is mutated under write_lock(mmu_lock) by gmap_set_limit()\nand keyop might use a stale asce value for walking as KVM_S390_KEYOP\nand KVM_S390_VM_MEM_LIMIT_SIZE can run concurrently. This can result\nin memory corruption."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - Triggered by KVM_S390_KEYOP and KVM_SET_DEVICE_ATTR(KVM_S390_VM_MEM_LIMIT_SIZE) ioctls on a VM fd from /dev/kvm. Not reachable via network packets or guest instruction emulation.\nAC:L - The attacker controls both sides of the race by issuing KEYOP and MEM_LIMIT_SIZE concurrently on a VM they created (before vCPUs exist). No victim state or other uncontrolled condition is required.\nPR:L - Regular (non-ucontrol) VM creation has no capability check; any user who can open /dev/kvm, typically via kvm-group membership, can create a VM and issue these ioctls. CAP_SYS_ADMIN is not required.\nUI:N - The attacker issues the ioctls on a VM they created; no separate user action is required.\nS:U - This is host-userspace-to-host-kernel memory corruption via KVM ioctls, not a guest-to-host escape. MEM_LIMIT_SIZE is rejected once vCPUs exist, and guest storage-key paths already read gmap->asce under mmu_lock.\nC:H - kvm_s390_keyop snapshots gmap->asce without mmu_lock while gmap_set_limit() can free that CRST under write_lock, a page-table use-after-free. Walking reused tables, including ISKE/page_get_storage_key, can disclose kernel memory.\nI:H - SSKE walks the stale ASCE with DAT_WALK_ALLOC and writes via page_set_storage_key and pgste updates. The use-after-free of gmap tables enables writes into recycled kernel memory and storage-key changes on attacker-chosen physical pages.\nA:H - Walking freed CRST/PTE memory or spinning on PGSTE locks derived from reused pages can oops, panic, or hang the host kernel."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"arch/s390/kvm/kvm-s390.c"
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],
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"versions": [
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{
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"version": "0ee4ddc1647b8b3b9e7a94d798a1774a764428c1",
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"lessThan": "ae452b990e0544425f77045351c56e77158858e7",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "0ee4ddc1647b8b3b9e7a94d798a1774a764428c1",
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"lessThan": "da07a751efa4583385f9f0f47113549fe8871242",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"arch/s390/kvm/kvm-s390.c"
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],
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"versions": [
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{
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"version": "7.0",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "7.0",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.5",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "7.0",
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"versionEndExcluding": "7.2.5"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "7.0",
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"versionEndExcluding": "7.3"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/ae452b990e0544425f77045351c56e77158858e7"
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},
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{
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"url": "https://git.kernel.org/stable/c/da07a751efa4583385f9f0f47113549fe8871242"
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}
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],
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"title": "KVM: s390: keyop: use mmu_lock to read gmap->asce",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |