CVE-2022-48870

In the Linux kernel, the following vulnerability has been resolved: tty: fix possible null-ptr-defer in spk_ttyio_release Run the following tests on the qemu platform: syzkaller:~# modprobe speakup_audptr input: Speakup as /devices/virtual/input/input4 initialized device: /dev/synth, node (MAJOR 10, MINOR 125) speakup 3.1.6: initialized synth name on entry is: (null) synth probe spk_ttyio_initialise_ldisc failed because tty_kopen_exclusive returned failed (errno -16), then remove the module, we will get a null-ptr-defer problem, as follow: syzkaller:~# modprobe -r speakup_audptr releasing synth audptr BUG: kernel NULL pointer dereference, address: 0000000000000080 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: 0002 [#1] PREEMPT SMP PTI CPU: 2 PID: 204 Comm: modprobe Not tainted 6.1.0-rc6-dirty #1 RIP: 0010:mutex_lock+0x14/0x30 Call Trace: <TASK> spk_ttyio_release+0x19/0x70 [speakup] synth_release.part.6+0xac/0xc0 [speakup] synth_remove+0x56/0x60 [speakup] __x64_sys_delete_module+0x156/0x250 ? fpregs_assert_state_consistent+0x1d/0x50 do_syscall_64+0x37/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd </TASK> Modules linked in: speakup_audptr(-) speakup Dumping ftrace buffer: in_synth->dev was not initialized during modprobe, so we add check for in_synth->dev to fix this bug.
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

History

06 Sep 2024, 14:20

Type Values Removed Values Added
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
CVSS v2 : unknown
v3 : unknown
v2 : unknown
v3 : 5.5
CWE CWE-476
References () https://git.kernel.org/stable/c/2da67bff29ab49caafb0766e8b8383b735ff796f - () https://git.kernel.org/stable/c/2da67bff29ab49caafb0766e8b8383b735ff796f - Patch
References () https://git.kernel.org/stable/c/5abbeebd8296c2301023b8dc4b5a6c0d5229b4f5 - () https://git.kernel.org/stable/c/5abbeebd8296c2301023b8dc4b5a6c0d5229b4f5 - Patch
References () https://git.kernel.org/stable/c/64152e05a4de3ebf59f1740a0985a6d5fba0c77b - () https://git.kernel.org/stable/c/64152e05a4de3ebf59f1740a0985a6d5fba0c77b - Patch
First Time Linux linux Kernel
Linux
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tty: corrige posible null-ptr-defer en spk_ttyio_release Ejecute las siguientes pruebas en la plataforma qemu: syzkaller:~# modprobe Speakup_audptr input: Speakup as /devices/virtual/input/input4 dispositivo inicializado: /dev/synth, nodo (MAJOR 10, MINOR 125) Speakup 3.1.6: el nombre del sintetizador inicializado en la entrada es: (nulo) la sonda de sintetizador spk_ttyio_initialise_ldisc falló porque tty_kopen_exclusive devolvió un error (errno -16), luego elimine el módulo, obtendremos un problema de aplazamiento de ptr nulo, como sigue: syzkaller:~# modprobe -r Speakup_audptr liberando sintetizador audptr ERROR: desreferencia del puntero NULL del kernel, dirección: 00000000000000080 #PF: acceso de escritura del supervisor en modo kernel #PF: código_error(0x0002 ) - página no presente PGD 0 P4D 0 Ups: 0002 [#1] PREEMPT SMP PTI CPU: 2 PID: 204 Comm: modprobe No contaminado 6.1.0-rc6-dirty #1 RIP: 0010:mutex_lock+0x14/0x30 Llamada Seguimiento: spk_ttyio_release+0x19/0x70 [speakup] synth_release.part.6+0xac/0xc0 [speakup] synth_remove+0x56/0x60 [speakup] __x64_sys_delete_module+0x156/0x250? fpregs_assert_state_consistent+0x1d/0x50 do_syscall_64+0x37/0x90 entry_syscall_64_after_hwframe+0x63/0xcd módulos vinculados en: sheakup_audptr (-) volcando ftrace búfer: in_synth-&gt;&gt; nth-&gt; dev para corregir este error.

21 Aug 2024, 07:15

Type Values Removed Values Added
New CVE

Information

Published : 2024-08-21 07:15

Updated : 2024-09-06 14:20


NVD link : CVE-2022-48870

Mitre link : CVE-2022-48870

CVE.ORG link : CVE-2022-48870


JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-476

NULL Pointer Dereference