{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-23401","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-01-13T15:37:46.012Z","datePublished":"2026-04-01T08:36:32.367Z","dateUpdated":"2026-05-11T22:06:11.775Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:06:11.775Z"},"descriptions":[{"lang":"en","value":"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   <TASK>\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   </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":"a54aa15c6bda3ca7e2f9e040ba968a1da303e24f","lessThan":"20656cd1f243d3a154aac5dd1b823110b6906fe1","status":"affected","versionType":"git"},{"version":"a54aa15c6bda3ca7e2f9e040ba968a1da303e24f","lessThan":"ed5909992f344a7d3f4024261e9f751d9618a27d","status":"affected","versionType":"git"},{"version":"a54aa15c6bda3ca7e2f9e040ba968a1da303e24f","lessThan":"fd28c5618699180cd69619801e9ae6a5266c0a22","status":"affected","versionType":"git"},{"version":"a54aa15c6bda3ca7e2f9e040ba968a1da303e24f","lessThan":"459158151a158a6703b49f3c9de0e536d8bd553f","status":"affected","versionType":"git"},{"version":"a54aa15c6bda3ca7e2f9e040ba968a1da303e24f","lessThan":"695320de6eadb75aaed8be1787c4ce4c189e4c7b","status":"affected","versionType":"git"},{"version":"a54aa15c6bda3ca7e2f9e040ba968a1da303e24f","lessThan":"bce7fe59d43531623f3e43779127bfb33804925d","status":"affected","versionType":"git"},{"version":"a54aa15c6bda3ca7e2f9e040ba968a1da303e24f","lessThan":"aad885e774966e97b675dfe928da164214a71605","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":"5.13","status":"affected"},{"version":"0","lessThan":"5.13","status":"unaffected","versionType":"semver"},{"version":"5.15.203","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.168","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.131","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.80","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.21","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"6.19.11","lessThanOrEqual":"6.19.*","status":"unaffected","versionType":"semver"},{"version":"7.0","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":"5.13","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.1.168"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.6.131"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.12.80"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.18.21"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"6.19.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.13","versionEndExcluding":"7.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/20656cd1f243d3a154aac5dd1b823110b6906fe1"},{"url":"https://git.kernel.org/stable/c/ed5909992f344a7d3f4024261e9f751d9618a27d"},{"url":"https://git.kernel.org/stable/c/fd28c5618699180cd69619801e9ae6a5266c0a22"},{"url":"https://git.kernel.org/stable/c/459158151a158a6703b49f3c9de0e536d8bd553f"},{"url":"https://git.kernel.org/stable/c/695320de6eadb75aaed8be1787c4ce4c189e4c7b"},{"url":"https://git.kernel.org/stable/c/bce7fe59d43531623f3e43779127bfb33804925d"},{"url":"https://git.kernel.org/stable/c/aad885e774966e97b675dfe928da164214a71605"}],"title":"KVM: x86/mmu: Drop/zap existing present SPTE even when creating an MMIO SPTE","x_generator":{"engine":"bippy-1.2.0"}}}}