CVE-2024-46798

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ASoC: dapm: Fix UAF for snd_soc_pcm_runtime object<br /> <br /> When using kernel with the following extra config,<br /> <br /> - CONFIG_KASAN=y<br /> - CONFIG_KASAN_GENERIC=y<br /> - CONFIG_KASAN_INLINE=y<br /> - CONFIG_KASAN_VMALLOC=y<br /> - CONFIG_FRAME_WARN=4096<br /> <br /> kernel detects that snd_pcm_suspend_all() access a freed<br /> &amp;#39;snd_soc_pcm_runtime&amp;#39; object when the system is suspended, which<br /> leads to a use-after-free bug:<br /> <br /> [ 52.047746] BUG: KASAN: use-after-free in snd_pcm_suspend_all+0x1a8/0x270<br /> [ 52.047765] Read of size 1 at addr ffff0000b9434d50 by task systemd-sleep/2330<br /> <br /> [ 52.047785] Call trace:<br /> [ 52.047787] dump_backtrace+0x0/0x3c0<br /> [ 52.047794] show_stack+0x34/0x50<br /> [ 52.047797] dump_stack_lvl+0x68/0x8c<br /> [ 52.047802] print_address_description.constprop.0+0x74/0x2c0<br /> [ 52.047809] kasan_report+0x210/0x230<br /> [ 52.047815] __asan_report_load1_noabort+0x3c/0x50<br /> [ 52.047820] snd_pcm_suspend_all+0x1a8/0x270<br /> [ 52.047824] snd_soc_suspend+0x19c/0x4e0<br /> <br /> The snd_pcm_sync_stop() has a NULL check on &amp;#39;substream-&gt;runtime&amp;#39; before<br /> making any access. So we need to always set &amp;#39;substream-&gt;runtime&amp;#39; to NULL<br /> everytime we kfree() it.