{ "affected": [ { "ranges": [ { "events": [ { "introduced": "a54aa15c6bda3ca7e2f9e040ba968a1da303e24f" }, { "fixed": "20656cd1f243d3a154aac5dd1b823110b6906fe1" }, { "fixed": "ed5909992f344a7d3f4024261e9f751d9618a27d" }, { "fixed": "fd28c5618699180cd69619801e9ae6a5266c0a22" }, { "fixed": "459158151a158a6703b49f3c9de0e536d8bd553f" }, { "fixed": "695320de6eadb75aaed8be1787c4ce4c189e4c7b" }, { "fixed": "bce7fe59d43531623f3e43779127bfb33804925d" }, { "fixed": "aad885e774966e97b675dfe928da164214a71605" } ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "type": "GIT" } ] }, { "package": { "ecosystem": "Linux", "name": "Kernel" }, "ranges": [ { "events": [ { "introduced": "5.13.0" }, { "fixed": "5.15.203" } ], "type": "ECOSYSTEM" }, { "events": [ { "introduced": "5.16.0" }, { "fixed": "6.1.168" } ], "type": "ECOSYSTEM" }, { "events": [ { "introduced": "6.2.0" }, { "fixed": "6.6.131" } ], "type": "ECOSYSTEM" }, { "events": [ { "introduced": "6.7.0" }, { "fixed": "6.12.80" } ], "type": "ECOSYSTEM" }, { "events": [ { "introduced": "6.13.0" }, { "fixed": "6.18.21" } ], "type": "ECOSYSTEM" }, { "events": [ { "introduced": "6.19.0" }, { "fixed": "6.19.11" } ], "type": "ECOSYSTEM" } ] } ], "database_specific": { "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23401.json" }, "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86/mmu: Drop/zap existing present SPTE even when creating an MMIO SPTE\n\nWhen installing an emulated MMIO SPTE, do so *after* dropping/zapping the\nexisting SPTE (if it's shadow-present). While commit a54aa15c6bda3 was\nright about it being impossible to convert a shadow-present SPTE to an\nMMIO SPTE due to a _guest_ write, it failed to account for writes to guest\nmemory that are outside the scope of KVM.\n\nE.g. if host userspace modifies a shadowed gPTE to switch from a memslot\nto emulted MMIO and then the guest hits a relevant page fault, KVM will\ninstall the MMIO SPTE without first zapping the shadow-present SPTE.\n\n ------------[ cut here ]------------\n is_shadow_present_pte(*sptep)\n WARNING: arch/x86/kvm/mmu/mmu.c:484 at mark_mmio_spte+0xb2/0xc0 [kvm], CPU#0: vmx_ept_stale_r/4292\n Modules linked in: kvm_intel kvm irqbypass\n CPU: 0 UID: 1000 PID: 4292 Comm: vmx_ept_stale_r Not tainted 7.0.0-rc2-eafebd2d2ab0-sink-vm #319 PREEMPT\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n RIP: 0010:mark_mmio_spte+0xb2/0xc0 [kvm]\n Call Trace:\n \u003cTASK\u003e\n mmu_set_spte+0x237/0x440 [kvm]\n ept_page_fault+0x535/0x7f0 [kvm]\n kvm_mmu_do_page_fault+0xee/0x1f0 [kvm]\n kvm_mmu_page_fault+0x8d/0x620 [kvm]\n vmx_handle_exit+0x18c/0x5a0 [kvm_intel]\n kvm_arch_vcpu_ioctl_run+0xc55/0x1c20 [kvm]\n kvm_vcpu_ioctl+0x2d5/0x980 [kvm]\n __x64_sys_ioctl+0x8a/0xd0\n do_syscall_64+0xb5/0x730\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\n RIP: 0033:0x47fa3f\n \u003c/TASK\u003e\n ---[ end trace 0000000000000000 ]---", "id": "CVE-2026-23401", "modified": "2026-07-08T05:38:42.341311785Z", "published": "2026-04-01T08:36:32.367Z", "references": [ { "type": "WEB", "url": "https://git.kernel.org/stable/c/20656cd1f243d3a154aac5dd1b823110b6906fe1" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/459158151a158a6703b49f3c9de0e536d8bd553f" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/695320de6eadb75aaed8be1787c4ce4c189e4c7b" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/aad885e774966e97b675dfe928da164214a71605" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/bce7fe59d43531623f3e43779127bfb33804925d" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/ed5909992f344a7d3f4024261e9f751d9618a27d" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/fd28c5618699180cd69619801e9ae6a5266c0a22" }, { "type": "WEB", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23401.json" }, { "type": "ADVISORY", "url": "https://access.redhat.com/errata/RHSA-2026:13577" }, { "type": "ADVISORY", "url": "https://access.redhat.com/errata/RHSA-2026:13578" }, { "type": "ADVISORY", "url": "https://access.redhat.com/errata/RHSA-2026:13932" }, { "type": "ADVISORY", "url": "https://access.redhat.com/errata/RHSA-2026:13936" }, { "type": "ADVISORY", "url": "https://access.redhat.com/errata/RHSA-2026:14137" }, { "type": "ADVISORY", "url": "https://access.redhat.com/errata/RHSA-2026:14230" }, { "type": "ADVISORY", "url": "https://access.redhat.com/errata/RHSA-2026:14339" }, { "type": "ADVISORY", "url": "https://access.redhat.com/errata/RHSA-2026:15883" }, { "type": "ADVISORY", "url": "https://access.redhat.com/errata/RHSA-2026:19521" }, { "type": "ADVISORY", "url": "https://access.redhat.com/errata/RHSA-2026:19568" }, { "type": "ADVISORY", "url": "https://access.redhat.com/errata/RHSA-2026:19569" }, { "type": "ADVISORY", "url": "https://access.redhat.com/errata/RHSA-2026:19875" }, { "type": "ADVISORY", "url": "https://access.redhat.com/errata/RHSA-2026:20593" }, { "type": "ADVISORY", "url": "https://access.redhat.com/security/cve/CVE-2026-23401" }, { "type": "ADVISORY", "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23401.json" }, { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23401" }, { "type": "REPORT", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2453803" }, { "type": "PACKAGE", "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git" } ], "schema_version": "1.7.5", "severity": [ { "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H", "type": "CVSS_V3" } ], "summary": "KVM: x86/mmu: Drop/zap existing present SPTE even when creating an MMIO SPTE" }