CVE-2022-48771 drm/vmwgfx: Fix stale file descriptors on failed usercopy

2024-06-2011:13:45

Linux

www.cve.org

linux kernel

vulnerability

drm/vmwgfx

stale file descriptors

usercopy

exploitation

0.0004 Low

EPSS

Percentile

10.4%

JSON

In the Linux kernel, the following vulnerability has been resolved:

drm/vmwgfx: Fix stale file descriptors on failed usercopy

A failing usercopy of the fence_rep object will lead to a stale entry in
the file descriptor table as put_unused_fd() won’t release it. This
enables userland to refer to a dangling ‘file’ object through that still
valid file descriptor, leading to all kinds of use-after-free
exploitation scenarios.

Fix this by deferring the call to fd_install() until after the usercopy
has succeeded.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/gpu/drm/vmwgfx/vmwgfx_drv.h",
      "drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c",
      "drivers/gpu/drm/vmwgfx/vmwgfx_fence.c",
      "drivers/gpu/drm/vmwgfx/vmwgfx_kms.c"
    ],
    "versions": [
      {
        "version": "c906965dee22",
        "lessThan": "e8d092a62449",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "c906965dee22",
        "lessThan": "0008a0c78fc3",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "c906965dee22",
        "lessThan": "84b1259fe36a",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "c906965dee22",
        "lessThan": "ae2b20f27732",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "c906965dee22",
        "lessThan": "6066977961fc",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "c906965dee22",
        "lessThan": "1d833b27fb70",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "c906965dee22",
        "lessThan": "a0f90c881570",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/gpu/drm/vmwgfx/vmwgfx_drv.h",
      "drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c",
      "drivers/gpu/drm/vmwgfx/vmwgfx_fence.c",
      "drivers/gpu/drm/vmwgfx/vmwgfx_kms.c"
    ],
    "versions": [
      {
        "version": "4.14",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "4.14",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.14.264",
        "lessThanOrEqual": "4.14.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "4.19.227",
        "lessThanOrEqual": "4.19.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.175",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.95",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.18",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.16.4",
        "lessThanOrEqual": "5.16.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.17",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]