CVE-2025-40277

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There is no network or remote path into the command verifier.\nAC:L - The attacker fully and deterministically controls header->size in the command stream they submit; setting it to 0xFFFFFFF8..0xFFFFFFFF reliably wraps the 32-bit size computation and bypasses the size_remaining check every time. No race, timing window, or uncontrollable precondition is involved.\nPR:L - VMW_EXECBUF is declared DRM_RENDER_ALLOW and vmwgfx sets DRIVER_RENDER, so no DRM master or authentication is needed \u2014 any unprivileged local user with access to the render node (standard for graphics/desktop users and containers in VMware guests) can submit commands.\nUI:N - The attacker triggers the flaw entirely on their own by issuing the execbuf ioctl with a crafted SVGA3D command header. No victim action or interaction is required.\nS:U - The integer overflow and the resulting out-of-bounds accesses occur within the guest kernel's own address space and are confined to the kernel's security authority. No hypervisor, IOMMU, or sandbox boundary is crossed by the kernel-side defect itself.\nC:H - The unchecked header->size drives pointer arithmetic in vmw_cmd_dma(), vmw_cmd_draw(), and vmw_cmd_tex_state(), producing large out-of-bounds reads of adjacent kernel memory whose contents are interpreted as resource handles; success/failure of vmw_user_resource_lookup_handle() forms a scanning oracle over kernel heap contents, so arbitrary kernel memory disclosure is achievable.\nI:H - The same overflow yields out-of-bounds writes \u2014 vmw_cmd_dma() writes bo_size into suffix->maximumOffset past the buffer, and OOB-derived relocation offsets cause vmw_resource_relocations_apply() to write 32-bit resource IDs outside the command buffer. Controlled heap corruption of this kind is a standard path to privilege escalation.\nA:H - A header->size of 0xFFFFFFF8 makes *size zero, causing vmw_cmd_check_all() to spin forever while holding dev_priv->cmdbuf_mutex, and the far out-of-bounds reads past a vmalloc'd bounce buffer hit a guard page and oops the kernel. 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from userspace and is used in buffer offset\ncalculations which could potentially overflow causing an out-of-bounds\naccess."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ndrm/vmwgfx: Validar el tama\u00f1o del encabezado del comando contra SVGA_CMD_MAX_DATASIZE\n\nEstos datos se originan del espacio de usuario y se utilizan en c\u00e1lculos de desplazamiento de b\u00fafer que podr\u00edan desbordarse potencialmente, causando un acceso fuera de l\u00edmites."}], "id": "CVE-2025-40277", "lastModified": "2026-10-15T19:10:00.173", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-40277", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-16T19:51:12.603019Z", "version": "2.0.3"}}]}, "published": "2025-12-06T22:15:55.560", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/32b415a9dc2c212e809b7ebc2b14bc3fbda2b9af"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/54d458b244893e47bda52ec3943fdfbc8d7d068b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5aea2cde03d4247cdcf53f9ab7d0747c9dca1cfc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/709e5c088f9c99a5cf2c1d1c6ce58f2cca7ab173"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a3abb54c27b2c393c44362399777ad2f6e1ff17e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b5df9e06eed3df6a4f5c6f8453013b0cabb927b4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e58559845021c3bad5e094219378b869157fad53"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f3f3a8eb3f0ba799fae057091d8c67cca12d6fa0"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: drm/vmwgfx: Validate command header size against SVGA_CMD_MAX_DATASIZE", "id": "2419954", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2419954"}, "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-190", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndrm/vmwgfx: Validate command header size against SVGA_CMD_MAX_DATASIZE\nThis data originates from userspace and is used in buffer offset\ncalculations which could potentially overflow causing an out-of-bounds\naccess."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, prevent module vmwgfx from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically."}, "name": "CVE-2025-40277", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"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": "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "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": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-12-06T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-40277\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-40277\nhttps://lore.kernel.org/linux-cve-announce/2025120717-CVE-2025-40277-d511@gregkh/T"], "statement": "A local attacker with access to the vmwgfx device could trigger an integer overflow when sending crafted SVGA3D command buffers with a malformed header size. The unchecked header->size field is used in buffer offset arithmetic, leading to potential out-of-bounds memory access in the kernel. The patch enforces a maximum bound (SVGA_CMD_MAX_DATASIZE) to prevent overflows. This issue may allow denial of service or privilege escalation within the guest VM.", "threat_severity": "Moderate"}

{}