{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-47727", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-09-30T16:00:12.957Z", "datePublished": "2024-10-21T12:14:00.330Z", "dateUpdated": "2026-08-05T11:39:46.427Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:39:46.427Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/tdx: Fix \"in-kernel MMIO\" check\n\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.\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." } ], "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 — 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" } } ] } }