{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-98465", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.350Z", "datePublished": "2026-10-18T15:15:17.498Z", "dateUpdated": "2026-10-24T14:08:57.467Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-24T14:08:57.467Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRISC-V: KVM: Serialize IMSIC attributes with vCPU migration\n\nKVM device ioctls are not serialized against KVM_RUN. As a result,\nkvm_riscv_aia_imsic_rw_attr() can snapshot the physical CPU and HGEI of\nan IMSIC VS-file before a concurrent vCPU migration releases it.\n\nThe HGEI can then be allocated to another vCPU before imsic_vsfile_rw()\nuses the stale tuple. A GET or SET attribute may consequently access the\nnew owner's interrupt file.\n\nSerialize the entire IMSIC attribute operation with the target vCPU\nmutex. This prevents the VS-file from being migrated and recycled until\nthe attribute access completes. Acquire the mutex killably so that the\ndevice ioctl remains interruptible while waiting for KVM_RUN to finish." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:H", "baseScore": 7, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - A local process reaches the patched kvm_riscv_aia_imsic_rw_attr() through kvm_device_ioctl() and aia_get_attr()/aia_set_attr() using KVM_GET_DEVICE_ATTR or KVM_SET_DEVICE_ATTR; no network or guest-protocol input reaches it.\nAC:H - The attacker can race its attribute ioctl against KVM_RUN, but cross-owner impact also requires kvm_riscv_aia_alloc_hgei() to reassign the freed per-CPU HGEI to a victim vCPU before imsic_vsfile_rw() runs, which the attacker cannot ensure.\nPR:L - No capable() check guards this path, but the caller must have opened /dev/kvm and created and retained the VM, vCPU, and RISC-V AIA device fds; ordinary authorized KVM-user access suffices without init-namespace administration.\nUI:N - The attacking process itself issues the concurrent KVM_RUN and KVM_GET_DEVICE_ATTR or KVM_SET_DEVICE_ATTR operations; no victim user must mount, open, or approve anything.\nS:C - kvm_riscv_aia_alloc_hgei() uses the global per-CPU aia_hgei owners array rather than a per-VM pool, so the recycled interrupt file can belong to a vCPU in a different VM security boundary.\nC:L - A stale GET makes imsic_vsfile_local_rw() disclose one selected EIDELIVERY, EITHRESHOLD, EIP*, or EIE* word from the new owner's interrupt file, exposing bounded interrupt state rather than arbitrary guest or host memory.\nI:L - A stale SET makes imsic_vsfile_local_rw() write attacker-chosen values to the new owner's delivery, threshold, pending, or enable register, but it provides no arbitrary memory write or demonstrated control-flow primitive.\nA:H - imsic_vsfile_local_rw() can write EIDELIVERY=0 or clear EIE* in the new owner's file; for a single-vCPU victim this suppresses all external-interrupt delivery and can leave guest I/O persistently hung." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/riscv/kvm/aia_imsic.c" ], "versions": [ { "version": "db8b7e97d6137a28b2bfc07e591d54da268f0c36", "lessThan": "6c2bcf6b173d4afed883cceea9d47f2c5194161d", "status": "affected", "versionType": "git" }, { "version": "db8b7e97d6137a28b2bfc07e591d54da268f0c36", "lessThan": "a29c5d2dd2ef9a8617a9a6d5585696d5f149cd98", "status": "affected", "versionType": "git" }, { "version": "db8b7e97d6137a28b2bfc07e591d54da268f0c36", "lessThan": "c525772c304c971b0d3a1f2898dedbae653efe90", "status": "affected", "versionType": "git" }, { "version": "db8b7e97d6137a28b2bfc07e591d54da268f0c36", "lessThan": "71acbea44e78665ea90e3c310fca6bbdcc0252db", "status": "affected", "versionType": "git" }, { "version": "db8b7e97d6137a28b2bfc07e591d54da268f0c36", "lessThan": "8ae12ccaec6ec74945d8c1ef39f2c1b8df779abc", "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/riscv/kvm/aia_imsic.c" ], "versions": [ { "version": "6.5", "status": "affected" }, { "version": "0", "lessThan": "6.5", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.55", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.9", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "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": "6.5", "versionEndExcluding": "6.6.160" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.12.112" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "6.18.55" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "7.2.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.5", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/6c2bcf6b173d4afed883cceea9d47f2c5194161d" }, { "url": "https://git.kernel.org/stable/c/a29c5d2dd2ef9a8617a9a6d5585696d5f149cd98" }, { "url": "https://git.kernel.org/stable/c/c525772c304c971b0d3a1f2898dedbae653efe90" }, { "url": "https://git.kernel.org/stable/c/71acbea44e78665ea90e3c310fca6bbdcc0252db" }, { "url": "https://git.kernel.org/stable/c/8ae12ccaec6ec74945d8c1ef39f2c1b8df779abc" } ], "title": "RISC-V: KVM: Serialize IMSIC attributes with vCPU migration", "x_generator": { "engine": "bippy-1.2.0" } } } }