{ "cveId": "CVE-2026-23402", "url": "https://patchblox.com/security/cve/CVE-2026-23402", "summary": "CVE-2026-23402 is fixed in 19 products on 1 platform, first by DEBIAN-CVE-2026-23402, released April 1, 2026. It is not reported as exploited. Patch Radar priority: Routine.", "title": "linux: In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Only WARN in direct MMUs when over...", "description": "In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Only WARN in direct MMUs when overwriting shadow-present SPTE Adjust KVM\u0027s sanity check against overwriting a shadow-present SPTE with a another SPTE with a different target PFN to only apply to direct MMUs, i.e. only to MMUs without shadowed gPTEs. While it\u0027s impossible for KVM to overwrite a shadow-present SPTE in response to a guest write, writes from outside the scope of KVM, e.g. from host userspace, aren\u0027t detected by KVM\u0027s write tracking and so can break KVM\u0027s shadow paging rules. ------------[ cut here ]------------ pfn != spte_to_pfn(*sptep) WARNING: arch/x86/kvm/mmu/mmu.c:3069 at mmu_set_spte\u002B0x1e4/0x440 [kvm], CPU#0: vmx_ept_stale_r/872 Modules linked in: kvm_intel kvm irqbypass CPU: 0 UID: 1000 PID: 872 Comm: vmx_ept_stale_r Not tainted 7.0.0-rc2-eafebd2d2ab0-sink-vm #319 PREEMPT Hardware name: QEMU Standard PC (Q35 \u002B ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:mmu_set_spte\u002B0x1e4/0x440 [kvm] Call Trace: \u003CTASK\u003E ept_page_fault\u002B0x535/0x7f0 [kvm] kvm_mmu_do_page_fault\u002B0xee/0x1f0 [kvm] kvm_mmu_page_fault\u002B0x8d/0x620 [kvm] vmx_handle_exit\u002B0x18c/0x5a0 [kvm_intel] kvm_arch_vcpu_ioctl_run\u002B0xc55/0x1c20 [kvm] kvm_vcpu_ioctl\u002B0x2d5/0x980 [kvm] __x64_sys_ioctl\u002B0x8a/0xd0 do_syscall_64\u002B0xb5/0x730 entry_SYSCALL_64_after_hwframe\u002B0x4b/0x53 \u003C/TASK\u003E ---[ end trace 0000000000000000 ]---", "published": "2026-04-01T09:16:15Z", "severity": "medium", "cvss": 5.5, "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "epss": 0.00172, "epssPercentile": 0.06619, "priority": "Routine", "priorityTier": 4, "exploited": false, "vendorExploited": false, "disclosed": false, "fixes": [ { "platform": "linux", "product": "bpftool6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.25-52.107.amzn2023", "fix": "ALAS2023-2026-1746", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1746", "released": "2026-05-25T09:00:00Z" }, { "platform": "linux", "product": "bpftool6.18-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.25-52.107.amzn2023", "fix": "ALAS2023-2026-1746", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1746", "released": "2026-05-25T09:00:00Z" }, { "platform": "linux", "product": "kernel-livepatch-6.18.25-52.107", "release": "amzn 2023", "fixedVersion": "1:1.0-0.amzn2023", "fix": "ALAS2023-2026-1746", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1746", "released": "2026-05-25T09:00:00Z" }, { "platform": "linux", "product": "kernel6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.25-52.107.amzn2023", "fix": "ALAS2023-2026-1746", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1746", "released": "2026-05-25T09:00:00Z" }, { "platform": "linux", "product": "kernel6.18-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.25-52.107.amzn2023", "fix": "ALAS2023-2026-1746", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1746", "released": "2026-05-25T09:00:00Z" }, { "platform": "linux", "product": "kernel6.18-debuginfo-common-aarch64", "release": "amzn 2023", "fixedVersion": "1:6.18.25-52.107.amzn2023", "fix": "ALAS2023-2026-1746", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1746", "released": "2026-05-25T09:00:00Z" }, { "platform": "linux", "product": "kernel6.18-debuginfo-common-x86_64", "release": "amzn 2023", "fixedVersion": "1:6.18.25-52.107.amzn2023", "fix": "ALAS2023-2026-1746", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1746", "released": "2026-05-25T09:00:00Z" }, { "platform": "linux", "product": "kernel6.18-devel", "release": "amzn 2023", "fixedVersion": "1:6.18.25-52.107.amzn2023", "fix": "ALAS2023-2026-1746", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1746", "released": "2026-05-25T09:00:00Z" }, { "platform": "linux", "product": "kernel6.18-headers", "release": "amzn 2023", "fixedVersion": "1:6.18.25-52.107.amzn2023", "fix": "ALAS2023-2026-1746", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1746", "released": "2026-05-25T09:00:00Z" }, { "platform": "linux", "product": "kernel6.18-modules-extra", "release": "amzn 2023", "fixedVersion": "1:6.18.25-52.107.amzn2023", "fix": "ALAS2023-2026-1746", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1746", "released": "2026-05-25T09:00:00Z" }, { "platform": "linux", "product": "kernel6.18-modules-extra-common", "release": "amzn 2023", "fixedVersion": "1:6.18.25-52.107.amzn2023", "fix": "ALAS2023-2026-1746", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1746", "released": "2026-05-25T09:00:00Z" }, { "platform": "linux", "product": "kernel6.18-tools", "release": "amzn 2023", "fixedVersion": "1:6.18.25-52.107.amzn2023", "fix": "ALAS2023-2026-1746", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1746", "released": "2026-05-25T09:00:00Z" }, { "platform": "linux", "product": "kernel6.18-tools-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.25-52.107.amzn2023", "fix": "ALAS2023-2026-1746", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1746", "released": "2026-05-25T09:00:00Z" }, { "platform": "linux", "product": "kernel6.18-tools-devel", "release": "amzn 2023", "fixedVersion": "1:6.18.25-52.107.amzn2023", "fix": "ALAS2023-2026-1746", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1746", "released": "2026-05-25T09:00:00Z" }, { "platform": "linux", "product": "linux", "release": "Debian 14", "fixedVersion": "6.19.11-1", "fix": "DEBIAN-CVE-2026-23402", "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-23402", "released": "2026-04-01T09:16:15Z" }, { "platform": "linux", "product": "perf6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.25-52.107.amzn2023", "fix": "ALAS2023-2026-1746", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1746", "released": "2026-05-25T09:00:00Z" }, { "platform": "linux", "product": "perf6.18-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.25-52.107.amzn2023", "fix": "ALAS2023-2026-1746", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1746", "released": "2026-05-25T09:00:00Z" }, { "platform": "linux", "product": "python3-perf6.18", "release": "amzn 2023", "fixedVersion": "1:6.18.25-52.107.amzn2023", "fix": "ALAS2023-2026-1746", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1746", "released": "2026-05-25T09:00:00Z" }, { "platform": "linux", "product": "python3-perf6.18-debuginfo", "release": "amzn 2023", "fixedVersion": "1:6.18.25-52.107.amzn2023", "fix": "ALAS2023-2026-1746", "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1746", "released": "2026-05-25T09:00:00Z" } ], "noFixYet": [], "dataAsOf": "2026-11-07T06:34:28Z" }