CVE-2025-21687

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There is no network-facing path to vfio_platform_read/write.\nAC:L - The attacker directly and deterministically controls both the file offset (40 bits, unchecked against reg->size) and the byte count, so a single pwrite()/pread() reliably performs an out-of-bounds MMIO access at any chosen offset with no race, timing, or uncontrolled precondition.\nPR:L - Only an open fd on the VFIO device is needed; the IOMMU-backed VFIO path enforces no capability check (CAP_SYS_RAWIO is required only for the no-iommu mode), and VFIO is expressly designed to grant unprivileged users device access via file permissions. Handing the device node to a non-root user (QEMU, userspace drivers) is the normal deployment.\nUI:N - The attacker performs the entire attack by issuing syscalls on a descriptor it opens itself; no victim action, configuration change, or interaction with another user is required.\nS:U - The vulnerable component and the impacted component are both the Linux kernel \u2014 the out-of-bounds accesses land in kernel virtual address space managed by the same security authority. This is standard local kernel compromise, not a guest-to-host or IOMMU-crossing escape.\nC:H - ioread8/16/32 at an attacker-chosen offset up to 1 TiB past the ioremapped device window, with the value copied directly to userspace via copy_to_user, yields arbitrary kernel memory disclosure across the entire vmalloc/ioremap range (kernel stacks, vmalloc'd structures, other devices' MMIO).\nI:H - iowrite8/16/32 writes fully attacker-controlled data at an attacker-chosen kernel virtual address in the same 1 TiB window, giving an arbitrary kernel write that can corrupt VMAP_STACK kernel stacks, BPF JIT pages, and other drivers' registers (including SMMU control registers) \u2014 a direct path to code execution and privilege escalation.\nA:H - Accessing an unmapped virtual address in the out-of-bounds window causes a kernel data abort/oops or panic, and writes into unrelated devices' MMIO registers can wedge or hang the machine; this is trivially and repeatedly triggerable."}]}], "affected": 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{}

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para leer/escribir fuera de los l\u00edmites del dispositivo."}], "id": "CVE-2025-21687", "lastModified": "2026-07-30T06:19:12.340", "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"}]}, "published": "2025-02-10T16:15:38.207", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1485932496a1b025235af8aa1e21988d6b7ccd54"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/665cfd1083866f87301bbd232cb8ba48dcf4acce"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6bcb8a5b70b80143db9bf12dfa7d53636f824d53"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/92340e6c5122d823ad064984ef7513eba9204048"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9377cdc118cf327248f1a9dde7b87de067681dc9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a20fcaa230f7472456d12cf761ed13938e320ac3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c981c32c38af80737a2fedc16e270546d139ccdd"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ce9ff21ea89d191e477a02ad7eabf4f996b80a69"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d19a8650fd3d7aed8d1af1d9a77f979a8430eba1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ed81d82bb6e9df3a137f2c343ed689e6c68268ef"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f21636f24b6786c8b13f1af4319fa75ffcf17f38"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f65ce06387f8c1fb54bd59e18a8428248ec68eaf"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}, {"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: vfio/platform: check the bounds of read/write syscalls", "id": "2344682", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2344682"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nvfio/platform: check the bounds of read/write syscalls\ncount and offset are passed from user space and not checked, only\noffset is capped to 40 bits, which can be used to read/write out of\nbounds of the device."], "name": "CVE-2025-21687", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Will not fix", "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": "2025-02-10T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-21687\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-21687\nhttps://lore.kernel.org/linux-cve-announce/2025021054-CVE-2025-21687-59a8@gregkh/T"], "threat_severity": "Moderate"}

{}