{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-23402", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:46.012Z", "datePublished": "2026-04-01T08:36:33.366Z", "dateUpdated": "2026-04-01T08:36:33.366Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-04-01T08:36:33.366Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86/mmu: Only WARN in direct MMUs when overwriting shadow-present SPTE\n\nAdjust KVM's sanity check against overwriting a shadow-present SPTE with a\nanother SPTE with a different target PFN to only apply to direct MMUs,\ni.e. only to MMUs without shadowed gPTEs. While it's impossible for KVM\nto overwrite a shadow-present SPTE in response to a guest write, writes\nfrom outside the scope of KVM, e.g. from host userspace, aren't detected\nby KVM's write tracking and so can break KVM's shadow paging rules.\n\n ------------[ cut here ]------------\n pfn != spte_to_pfn(*sptep)\n WARNING: arch/x86/kvm/mmu/mmu.c:3069 at mmu_set_spte+0x1e4/0x440 [kvm], CPU#0: vmx_ept_stale_r/872\n Modules linked in: kvm_intel kvm irqbypass\n CPU: 0 UID: 1000 PID: 872 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:mmu_set_spte+0x1e4/0x440 [kvm]\n Call Trace:\n <TASK>\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 </TASK>\n ---[ end trace 0000000000000000 ]---"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/x86/kvm/mmu/mmu.c"], "versions": [{"version": "11d45175111d933c5175acc28e56af2213dd5cd6", "lessThan": "df83746075778958954aa0460cca55f4b3fc9c02", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/x86/kvm/mmu/mmu.c"], "versions": [{"version": "6.16", "status": "affected"}, {"version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver"}, {"version": "7.0-rc6", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.0-rc6"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/df83746075778958954aa0460cca55f4b3fc9c02"}], "title": "KVM: x86/mmu: Only WARN in direct MMUs when overwriting shadow-present SPTE", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86/mmu: Only WARN in direct MMUs when overwriting shadow-present SPTE\n\nAdjust KVM's sanity check against overwriting a shadow-present SPTE with a\nanother SPTE with a different target PFN to only apply to direct MMUs,\ni.e. only to MMUs without shadowed gPTEs. While it's impossible for KVM\nto overwrite a shadow-present SPTE in response to a guest write, writes\nfrom outside the scope of KVM, e.g. from host userspace, aren't detected\nby KVM's write tracking and so can break KVM's shadow paging rules.\n\n ------------[ cut here ]------------\n pfn != spte_to_pfn(*sptep)\n WARNING: arch/x86/kvm/mmu/mmu.c:3069 at mmu_set_spte+0x1e4/0x440 [kvm], CPU#0: vmx_ept_stale_r/872\n Modules linked in: kvm_intel kvm irqbypass\n CPU: 0 UID: 1000 PID: 872 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:mmu_set_spte+0x1e4/0x440 [kvm]\n Call Trace:\n <TASK>\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 </TASK>\n ---[ end trace 0000000000000000 ]---"}], "id": "CVE-2026-23402", "lastModified": "2026-04-01T14:23:37.727", "metrics": {}, "published": "2026-04-01T09:16:15.670", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/df83746075778958954aa0460cca55f4b3fc9c02"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: KVM: x86/mmu: Only WARN in direct MMUs when overwriting shadow-present SPTE", "id": "2453800", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2453800"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-501", "details": ["A flaw was found in the Linux kernel's Kernel-based Virtual Machine (KVM) module. This vulnerability allows a host user to bypass KVM's memory management rules by overwriting critical memory structures. This can lead to a compromise of the virtual machine's memory integrity, potentially causing system instability or unexpected behavior within virtualized environments."], "name": "CVE-2026-23402", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23402\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23402\nhttps://lore.kernel.org/linux-cve-announce/2026040110-CVE-2026-23402-c852@gregkh/T"], "threat_severity": "Low"}