CVE-2024-46798 ASoC: dapm: Fix UAF for snd_soc_pcm_runtime object

2024-09-1807:12:52

Linux

www.cve.org

linux kernel

asoc

fix uaf

snd_soc_pcm_runtime

use-after-free

EPSS

Percentile

11.0%

JSON

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

ASoC: dapm: Fix UAF for snd_soc_pcm_runtime object

When using kernel with the following extra config,

CONFIG_KASAN=y
CONFIG_KASAN_GENERIC=y
CONFIG_KASAN_INLINE=y
CONFIG_KASAN_VMALLOC=y
CONFIG_FRAME_WARN=4096

kernel detects that snd_pcm_suspend_all() access a freed
‘snd_soc_pcm_runtime’ object when the system is suspended, which
leads to a use-after-free bug:

[ 52.047746] BUG: KASAN: use-after-free in snd_pcm_suspend_all+0x1a8/0x270
[ 52.047765] Read of size 1 at addr ffff0000b9434d50 by task systemd-sleep/2330

[ 52.047785] Call trace:
[ 52.047787] dump_backtrace+0x0/0x3c0
[ 52.047794] show_stack+0x34/0x50
[ 52.047797] dump_stack_lvl+0x68/0x8c
[ 52.047802] print_address_description.constprop.0+0x74/0x2c0
[ 52.047809] kasan_report+0x210/0x230
[ 52.047815] __asan_report_load1_noabort+0x3c/0x50
[ 52.047820] snd_pcm_suspend_all+0x1a8/0x270
[ 52.047824] snd_soc_suspend+0x19c/0x4e0

The snd_pcm_sync_stop() has a NULL check on ‘substream->runtime’ before
making any access. So we need to always set ‘substream->runtime’ to NULL
everytime we kfree() it.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "sound/soc/soc-dapm.c"
    ],
    "versions": [
      {
        "version": "a72706ed8208",
        "lessThan": "993b60c7f93f",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "a72706ed8208",
        "lessThan": "8ca21e7a27c6",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "a72706ed8208",
        "lessThan": "3033ed903b4f",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "a72706ed8208",
        "lessThan": "fe5046ca91d6",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "a72706ed8208",
        "lessThan": "5d13afd021eb",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "a72706ed8208",
        "lessThan": "6a14fad8be17",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "a72706ed8208",
        "lessThan": "b4a90b543d9f",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "sound/soc/soc-dapm.c"
    ],
    "versions": [
      {
        "version": "5.4",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.4",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.4.284",
        "lessThanOrEqual": "5.4.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.226",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.167",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.110",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.51",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.10.10",
        "lessThanOrEqual": "6.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.11",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]