{"id":"CVE-2026-89919","title":"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,\nk…","summary":"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,\nk…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 0ee4ddc1647b8b3b9e7a94d798a1774a764428c1 < ae452b990e0544425f77045351c56e77158858e7","Linux >= 0ee4ddc1647b8b3b9e7a94d798a1774a764428c1 < da07a751efa4583385f9f0f47113549fe8871242","Linux 7.0"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T15:18:18.130","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89919","references":[{"url":"https://git.kernel.org/stable/c/ae452b990e0544425f77045351c56e77158858e7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/da07a751efa4583385f9f0f47113549fe8871242","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89919.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89919"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2535387"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89919"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89919"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89919.mbox"},{"url":"https://kernelcve.org/list/?q=CVE-2026-89919"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"ingestedAt":"2026-09-16T10:53:53.973Z","epss":0.00165,"epssPercentile":0.05668,"cwe":["CWE-787"],"scores":{"nvd":7.8,"vendor":4.7},"slug":"CVE-2026-89919","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89919.json)","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":205124,"id":"CVE-2026-89919","ts":1789570705361,"field":"cvss","old":null,"new":"7.8"},{"seq":205123,"id":"CVE-2026-89919","ts":1789570705361,"field":"severity","old":"none","new":"high"}]}