CVE-2024-47727

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For example, if userspace can point a syscall to an MMIO address,\nsyscall does get_user() or put_user() on it, triggering MMIO #VE. The\nkernel will treat the #VE as in-kernel MMIO.\n\nEnsure that the target MMIO address is within the kernel before decoding\ninstruction."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Exploitation requires a local process inside the TDX guest to issue syscalls with a pointer into an MMIO/host-visible mapping; there is no network-reachable path to the #VE handler.\nAC:L - The attacker fully controls both the mapping and the syscall pointer, and get_user()/put_user() emit exactly the mov encodings that insn_decode_mmio() accepts, so the MMIO hypercall is triggered deterministically with no race or unpredictable state.\nPR:L - An ordinary unprivileged guest account suffices \u2014 any mapping of a device BAR or of DMA-coherent (decrypted/shared) memory exposed by a driver mmap works, and the untrusted VMM can force EPT-violation #VEs on shared pages at will.\nUI:N - The attacking process performs the mmap and the syscall itself; no other user or victim action is involved.\nS:U - The boundary bypassed is guest-userspace to guest-kernel within the same OS authority; this is not a guest-to-host escape or an IOMMU/DMA boundary bypass.\nC:H - Userspace obtains an unauthorized MMIO read primitive against device registers and forces kernel-context data out through TDVMCALL to the untrusted VMM, defeating the TD confidentiality guarantee; it is also the reachable path to the uninitialized-stack leak in mmio_read().\nI:H - The bug yields an unprivileged MMIO write primitive to device/hypervisor-visible registers (doorbells, DMA and control registers), and VMM-supplied read data is written directly into the kernel's pt_regs and acted upon mid-syscall.\nA:H - Unauthorized MMIO writes can misprogram or wedge virtual devices, and the userspace-reachable WARN_ON_ONCE()/-EIO paths reach ve_raise_fault() and die_addr(), producing an oops or a full panic under panic_on_warn."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/x86/coco/tdx/tdx.c"], "versions": [{"version": "31d58c4e557d46fa7f8557714250fb6f89c941ae", "lessThan": "25703a3c980e21548774eea8c8a87a75c5c8f58c", "status": "affected", "versionType": "git"}, {"version": "31d58c4e557d46fa7f8557714250fb6f89c941ae", "lessThan": "4c0c5dcb5471de5fc8f0a1c4980e5815339e1cee", "status": "affected", "versionType": "git"}, {"version": "31d58c4e557d46fa7f8557714250fb6f89c941ae", "lessThan": "18ecd5b74682839e7cdafb7cd1ec106df7baa18c", "status": "affected", "versionType": "git"}, {"version": "31d58c4e557d46fa7f8557714250fb6f89c941ae", "lessThan": "bca2e29f7e26ce7c3522f8b324c0bd85612f68e3", "status": "affected", "versionType": "git"}, {"version": "31d58c4e557d46fa7f8557714250fb6f89c941ae", "lessThan": "d4fc4d01471528da8a9797a065982e05090e1d81", "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/coco/tdx/tdx.c"], "versions": [{"version": "5.19", "status": "affected"}, {"version": "0", "lessThan": "5.19", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.113", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.54", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.10.13", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.11.2", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12", "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": "5.19", "versionEndExcluding": "6.1.113"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.6.54"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.10.13"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.11.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.12"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/25703a3c980e21548774eea8c8a87a75c5c8f58c"}, {"url": "https://git.kernel.org/stable/c/4c0c5dcb5471de5fc8f0a1c4980e5815339e1cee"}, {"url": "https://git.kernel.org/stable/c/18ecd5b74682839e7cdafb7cd1ec106df7baa18c"}, {"url": "https://git.kernel.org/stable/c/bca2e29f7e26ce7c3522f8b324c0bd85612f68e3"}, {"url": "https://git.kernel.org/stable/c/d4fc4d01471528da8a9797a065982e05090e1d81"}], "title": "x86/tdx: Fix \"in-kernel MMIO\" check", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-47727", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-10-21T13:01:01.673306Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-21T13:04:16.452Z"}}, {"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T22:21:23.601Z"}}]}}

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The handle_mmio()\nfunction checks if the #VE exception occurred in the kernel and rejects\nthe operation if it did not.\n\nHowever, userspace can deceive the kernel into performing MMIO on its\nbehalf. For example, if userspace can point a syscall to an MMIO address,\nsyscall does get_user() or put_user() on it, triggering MMIO #VE. 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The handle_mmio()\nfunction checks if the #VE exception occurred in the kernel and rejects\nthe operation if it did not.\n\nHowever, userspace can deceive the kernel into performing MMIO on its\nbehalf. For example, if userspace can point a syscall to an MMIO address,\nsyscall does get_user() or put_user() on it, triggering MMIO #VE. The\nkernel will treat the #VE as in-kernel MMIO.\n\nEnsure that the target MMIO address is within the kernel before decoding\ninstruction."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: x86/tdx: Se corrige la comprobaci\u00f3n \"MMIO en el kernel\" TDX solo admite operaciones MMIO iniciadas por el kernel. La funci\u00f3n handle_mmio() comprueba si la excepci\u00f3n #VE se produjo en el kernel y rechaza la operaci\u00f3n si no fue as\u00ed. Sin embargo, el espacio de usuario puede enga\u00f1ar al kernel para que realice MMIO en su nombre. Por ejemplo, si el espacio de usuario puede apuntar una llamada al sistema a una direcci\u00f3n MMIO, la llamada al sistema realiza get_user() o put_user() en ella, lo que activa MMIO #VE. El kernel tratar\u00e1 el #VE como MMIO en el kernel. Aseg\u00farese de que la direcci\u00f3n MMIO de destino est\u00e9 dentro del kernel antes de decodificar la instrucci\u00f3n."}], "id": "CVE-2024-47727", "lastModified": "2026-08-04T11:20:45.357", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-47727", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-10-21T13:01:01.673306Z", "version": "2.0.3"}}]}, "published": "2024-10-21T13:15:02.883", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/18ecd5b74682839e7cdafb7cd1ec106df7baa18c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/25703a3c980e21548774eea8c8a87a75c5c8f58c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4c0c5dcb5471de5fc8f0a1c4980e5815339e1cee"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bca2e29f7e26ce7c3522f8b324c0bd85612f68e3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d4fc4d01471528da8a9797a065982e05090e1d81"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-754"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: x86/tdx: Fix \"in-kernel MMIO\" check", "id": "2320259", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2320259"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-754", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nx86/tdx: Fix \"in-kernel MMIO\" check\nTDX only supports kernel-initiated MMIO operations. The handle_mmio()\nfunction checks if the #VE exception occurred in the kernel and rejects\nthe operation if it did not.\nHowever, userspace can deceive the kernel into performing MMIO on its\nbehalf. For example, if userspace can point a syscall to an MMIO address,\nsyscall does get_user() or put_user() on it, triggering MMIO #VE. The\nkernel will treat the #VE as in-kernel MMIO.\nEnsure that the target MMIO address is within the kernel before decoding\ninstruction.", "A flaw was found in the Linux kernel. Userspace can deceive the kernel into performing MMIO (Memory-Mapped IO) operations in TDX (Trust Domain Extensions) on its behalf, allowing a #VE (Virtualization Exception) to be incorrectly handled as a in-kernel MMIO operation."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2024-47727", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-10-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-47727\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-47727\nhttps://lore.kernel.org/linux-cve-announce/2024102105-CVE-2024-47727-1049@gregkh/T"], "statement": "This flaw can only cause a denial of service by an attacker with normal privileges, limiting the impact of this vulnerability.\nFor this reason, this flaw has been rated with a moderate severity.", "threat_severity": "Moderate"}

{}