CVE-2024-46698 video/aperture: optionally match the device in sysfb_disable()

2024-09-1305:29:25

Linux

www.cve.org

linux kernel

vulnerability

resolution

aperture

pci devices

sysfb_disable

vga class

device pointer

EPSS

Percentile

9.6%

JSON

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

video/aperture: optionally match the device in sysfb_disable()

In aperture_remove_conflicting_pci_devices(), we currently only
call sysfb_disable() on vga class devices. This leads to the
following problem when the pimary device is not VGA compatible:

A PCI device with a non-VGA class is the boot display
That device is probed first and it is not a VGA device so
sysfb_disable() is not called, but the device resources
are freed by aperture_detach_platform_device()
Non-primary GPU has a VGA class and it ends up calling sysfb_disable()
NULL pointer dereference via sysfb_disable() since the resources
have already been freed by aperture_detach_platform_device() when
it was called by the other device.

Fix this by passing a device pointer to sysfb_disable() and checking
the device to determine if we should execute it or not.

v2: Fix build when CONFIG_SCREEN_INFO is not set
v3: Move device check into the mutex
Drop primary variable in aperture_remove_conflicting_pci_devices()
Drop __init on pci sysfb_pci_dev_is_enabled()

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/firmware/sysfb.c",
      "drivers/of/platform.c",
      "drivers/video/aperture.c",
      "include/linux/sysfb.h"
    ],
    "versions": [
      {
        "version": "5ae3716cfdcd",
        "lessThan": "17e78f43de0c",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "5ae3716cfdcd",
        "lessThan": "b49420d6a1ae",
        "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/firmware/sysfb.c",
      "drivers/of/platform.c",
      "drivers/video/aperture.c",
      "include/linux/sysfb.h"
    ],
    "versions": [
      {
        "version": "6.5",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.5",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.10.8",
        "lessThanOrEqual": "6.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.11",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]