Linux/Unix 主机中安装的一个或多个程序包受到一个漏洞影响，而供应商没有提供补丁程序。

  - drm阻止 drm_copy_field() 尝试复制空指针存在驱动程序需要的一些 struct drm_driver 字段因为 drm_copy_field() 尝试通过 DRM_IOCTL_VERSION 将这些字段复制到用户空间。但可能是驱动程序具有缺陷且未设置某些字段这导致 drm_copy_field() 尝试复制空指针 [ +10.395966] 无法处理对 处 uaccess 例程之外的用户内存的内核访问虚拟地址 0000000000000000 [ +0.010955] Mem 中止信息[ +0.002835] ESR = 0x0000000096000004 [ +0.003872] EC = 0x25DABT当前 ELIL = 32 位 [+0.005395] SET = 0FnV = 0 [ +0.003113] EA = 0, S1PTW = 0 [ +0.003182] FSC = 0x04级别 0 转换错误 [ +0.004964] 数据中止信息[ +0.002919] ISV = 0, ISS = 0x00000004 [ +0.003886] CM = 0, WnR = 0 [+0.003040] user pgtable4k 页面48 位 VA, pgdp=0000000115dad000 [ +0.006536] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000 [ +0.006925] 内部错误Oops: 96000004 [#1] SMP ... [+0.011113] pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ +0.007061] pc :
    __pi_strlen+0x14/0x150 [ +0.003895] lr : drm_copy_field+0x30/0x1a4 [ +0.004156] sp : ffff8000094b3a50 [+0.003355] x29: ffff8000094b3a50 x28: ffff8000094b3b70 x27: x27: 0000000040] [0000] [00000.007242[0000]
    ffff443743c2ba00 x250000000000000000 x240000000000000040 [ +0.007243] x23ffff443743c2ba00 x22
    ffff8000094b3b70 x2100000000000000000 [ +0.007241] x200000000000000000x19ffff8000094b3b90 x18
    0000000000000000 [ +0.007241] x17: 0000000000000000 x16: 0000000000000000 x15: 0000aaab14b9af40 [+0.007241] x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 [ +0.007239] x11:
    0000000000000000 x10: 0000000000000000 x9 : ffffa524ad67d4d8 [ +0.007242] x8: 0101010101010101 x7
    7f7f7f7f7f7f7f7f7f x6 : 6c6e6263606e7141 [ +0.007239] x5 : 0000000000000000 x4: 0000000000000000 x3
    0000000000000000 [ +0.007241] x2 : 0000000000000000 x1 : ffff8000094b3b90 x0 : 0000000000000000 [+0.007240] Call trace: [ +0.002475] __pi_strlen+0x14/0x150 [ +0.003537] drm_version+0x84/0xac [ +0.003448] drm_ioctl_kernel+ 0xa8/0x16c [ +0.003975] drm_ioctl+0x270/0x580 [ +0.003448] __arm64_sys_ioctl+0xb8/0xfc [+0.003978] invoke_syscall+0x78/0x100 [ +0.003799] el0_svc_common.constprop.0+0x4c/0xf4 [ +0.004767] do_el0_svc+0x38/0x4c [ +0.003357] el0_svc+0x34/0x100 [ +0.003185] el0t_64_sync_handler+0x11c/0x150 [+0.004418] el0t_64_sync+0x190/0x194 [ +0.003716] Code: 92402c04 b200c3e8 f13fc09f 5400088c (a9400c02 ) [+0.006180] ---[ 结束跟踪 0000000000000000]--- (CVE-2022-50884)

请注意，Nessus 依赖供应商报告的程序包是否存在进行判断。

检测

Linux Distros 未修补的漏洞：CVE-2022-50884

medium Nessus 插件 ID 280787

版本 1.21