7.8

CVE-2022-49842

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

ASoC: core: Fix use-after-free in snd_soc_exit()

KASAN reports a use-after-free:

BUG: KASAN: use-after-free in device_del+0xb5b/0xc60
Read of size 8 at addr ffff888008655050 by task rmmod/387
CPU: 2 PID: 387 Comm: rmmod
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)
Call Trace:
<TASK>
dump_stack_lvl+0x79/0x9a
print_report+0x17f/0x47b
kasan_report+0xbb/0xf0
device_del+0xb5b/0xc60
platform_device_del.part.0+0x24/0x200
platform_device_unregister+0x2e/0x40
snd_soc_exit+0xa/0x22 [snd_soc_core]
__do_sys_delete_module.constprop.0+0x34f/0x5b0
do_syscall_64+0x3a/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
...
</TASK>

It's bacause in snd_soc_init(), snd_soc_util_init() is possble to fail,
but its ret is ignored, which makes soc_dummy_dev unregistered twice.

snd_soc_init()
    snd_soc_util_init()
        platform_device_register_simple(soc_dummy_dev)
        platform_driver_register() # fail
    	platform_device_unregister(soc_dummy_dev)
    platform_driver_register() # success
...
snd_soc_exit()
    snd_soc_util_exit()
    # soc_dummy_dev will be unregistered for second time

To fix it, handle error and stop snd_soc_init() when util_init() fail.
Also clean debugfs when util_init() or driver_register() fail.
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Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 3.0 < 4.9.334
Linux ≫ Linux Kernel Version >= 4.10 < 4.14.300
Linux ≫ Linux Kernel Version >= 4.15 < 4.19.267
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.225
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.156
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.80
Linux ≫ Linux Kernel Version >= 5.16 < 6.0.10
Linux ≫ Linux Kernel Version6.1 Updaterc1
Linux ≫ Linux Kernel Version6.1 Updaterc2
Linux ≫ Linux Kernel Version6.1 Updaterc3
Linux ≫ Linux Kernel Version6.1 Updaterc4
Linux ≫ Linux Kernel Version6.1 Updaterc5
Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.02% 0.033
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
134c704f-9b21-4f2e-91b3-4a467353bcc0 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.