// For flags

CVE-2021-47027

mt76: mt7921: fix kernel crash when the firmware fails to download

Severity Score

"-"
*CVSS v-

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

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

mt76: mt7921: fix kernel crash when the firmware fails to download

Fix kernel crash when the firmware is missing or fails to download.

[ 9.444758] kernel BUG at drivers/pci/msi.c:375!
[ 9.449363] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
[ 9.501033] pstate: a0400009 (NzCv daif +PAN -UAO)
[ 9.505814] pc : free_msi_irqs+0x180/0x184
[ 9.509897] lr : free_msi_irqs+0x40/0x184
[ 9.513893] sp : ffffffc015193870
[ 9.517194] x29: ffffffc015193870 x28: 00000000f0e94fa2
[ 9.522492] x27: 0000000000000acd x26: 000000000000009a
[ 9.527790] x25: ffffffc0152cee58 x24: ffffffdbb383e0d8
[ 9.533087] x23: ffffffdbb38628d0 x22: 0000000000040200
[ 9.538384] x21: ffffff8cf7de7318 x20: ffffff8cd65a2480
[ 9.543681] x19: ffffff8cf7de7000 x18: 0000000000000000
[ 9.548979] x17: ffffff8cf9ca03b4 x16: ffffffdc13ad9a34
[ 9.554277] x15: 0000000000000000 x14: 0000000000080800
[ 9.559575] x13: ffffff8cd65a2980 x12: 0000000000000000
[ 9.564873] x11: ffffff8cfa45d820 x10: ffffff8cfa45d6d0
[ 9.570171] x9 : 0000000000000040 x8 : ffffff8ccef1b780
[ 9.575469] x7 : aaaaaaaaaaaaaaaa x6 : 0000000000000000
[ 9.580766] x5 : ffffffdc13824900 x4 : ffffff8ccefe0000
[ 9.586063] x3 : 0000000000000000 x2 : 0000000000000000
[ 9.591362] x1 : 0000000000000125 x0 : ffffff8ccefe0000
[ 9.596660] Call trace:
[ 9.599095] free_msi_irqs+0x180/0x184
[ 9.602831] pci_disable_msi+0x100/0x130
[ 9.606740] pci_free_irq_vectors+0x24/0x30
[ 9.610915] mt7921_pci_probe+0xbc/0x250 [mt7921e]
[ 9.615693] pci_device_probe+0xd4/0x14c
[ 9.619604] really_probe+0x134/0x2ec
[ 9.623252] driver_probe_device+0x64/0xfc
[ 9.627335] device_driver_attach+0x4c/0x6c
[ 9.631506] __driver_attach+0xac/0xc0
[ 9.635243] bus_for_each_dev+0x8c/0xd4
[ 9.639066] driver_attach+0x2c/0x38
[ 9.642628] bus_add_driver+0xfc/0x1d0
[ 9.646365] driver_register+0x64/0xf8
[ 9.650101] __pci_register_driver+0x6c/0x7c
[ 9.654360] init_module+0x28/0xfdc [mt7921e]
[ 9.658704] do_one_initcall+0x13c/0x2d0
[ 9.662615] do_init_module+0x58/0x1e8
[ 9.666351] load_module+0xd80/0xeb4
[ 9.669912] __arm64_sys_finit_module+0xa8/0xe0
[ 9.674430] el0_svc_common+0xa4/0x16c
[ 9.678168] el0_svc_compat_handler+0x2c/0x40
[ 9.682511] el0_svc_compat+0x8/0x10
[ 9.686076] Code: a94257f6 f9400bf7 a8c47bfd d65f03c0 (d4210000)
[ 9.692155] ---[ end trace 7621f966afbf0a29 ]---
[ 9.697385] Kernel panic - not syncing: Fatal exception
[ 9.702599] SMP: stopping secondary CPUs
[ 9.706549] Kernel Offset: 0x1c03600000 from 0xffffffc010000000
[ 9.712456] PHYS_OFFSET: 0xfffffff440000000
[ 9.716625] CPU features: 0x080026,2a80aa18
[ 9.720795] Memory Limit: none

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mt76: mt7921: soluciona el fallo del kernel cuando no se puede descargar el firmware. Se soluciona el fallo del kernel cuando falta el firmware o no se puede descargar. [9.444758] ¡ERROR del kernel en drivers/pci/msi.c:375! [0 x40/ 0x184 [ 9.513893] sp : ffffffc015193870 [ 9.517194] x29: ffffffc015193870 x28: 00000000f0e94fa2 [ 9.522492] x27: 0000000000000acd x26: 000000 000000009a [ 9.527790] x25: ffffffc0152cee58 x24: ffffffdbb383e0d8 [ 9.533087] x23: ffffffdbb38628d0 x22: 0000000000040200 [ 9.538384] x21: ffffff8cf 7de7318 x20 : ffffff8cd65a2480 [ 9.543681] x19: ffffff8cf7de7000 x18: 0000000000000000 [ 9.548979] x17: ffffff8cf9ca03b4 x16: ffffffdc13ad9a34 [ 9.554277] x15: 00 00000000000000 x14: 0000000000080800 [ 9.559575] x13: ffffff8cd65a2980 x12: 00000000000000000 [ 9.564873] x11: ffffff8cfa45d820 x10: ffffff8cfa45 d6d0 [9.570171] X9: 000000000000000040 X8: FFFFFF8CCEF1B780 [9.575469] x7: aaaaaaaaaaaaaaaaa X6: 00000000000000000000 [9.580766] x5: fffffffdc13824900 x4: fffff8ce 00000000000000 x2: 000000000000000000 [9.591362] X1: 000000000000000125 X0: FFFFFFF8CCEFE0000 [9.596660] Llame Trace: [9.599095 ] free_msi_irqs+0x180/0x184 [ 9.602831] pci_disable_msi+0x100/0x130 [ 9.606740] pci_free_irq_vectors+0x24/0x30 [ 9.610915] mt7921_pci_probe+0xbc/0x250 [mt7921 e] [ 9.615693] pci_device_probe+0xd4/0x14c [ 9.619604] very_probe+0x134/0x2ec [ 9.623252] driver_probe_device+0x64/0xfc [ 9.627335] dispositivo_driver_attach+0x4c/0x6c [ 9.631506] __driver_attach+0xac/0xc0 [ 9.635243] bus_for_each_dev+0x8c/0xd4 [ 9.639066] driver_ adjuntar+0x2c/0x38 [ 9.642628] bus_add_driver+0xfc/0x1d0 [ 9.646365] driver_register+0x64/0xf8 [ 9.650101] __pci_register_driver+0x6c/0x7c [ 9.654360] init_module+0x28/0xfdc [mt7921e] [ 9.658704] do_one_initcall+0x13c/0x2d0 [ 9.662615] do_ módulo_init+0x58/0x1e8 [ 9.666351] módulo_carga+0xd80/0xeb4 [ 9.669912 ] __arm64_sys_finit_module+0xa8/0xe0 [ 9.674430] el0_svc_common+0xa4/0x16c [ 9.678168] el0_svc_compat_handler+0x2c/0x40 [ 9.682511] el0_svc_compat+0x8/0x10 [ 9.68 6076] Código: a94257f6 f9400bf7 a8c47bfd d65f03c0 (d4210000) [ 9.692155] ---[ fin trace 7621f966afbf0a29 ]--- [ 9.697385] Pánico del kernel: no se sincroniza: excepción grave [ 9.702599] SMP: detención de CPU secundarias [ 9.706549] Compensación del kernel: 0x1c03600000 de 0xffffffc010000000 [ 9.712456] PHYS_OFF CONJUNTO: 0xffffff440000000 [9.716625] Características de la CPU: 0x080026,2a80aa18 [ 9.720795] Límite de memoria: ninguno

*Credits: N/A
CVSS Scores
Attack Vector
-
Attack Complexity
-
Privileges Required
-
User Interaction
-
Scope
-
Confidentiality
-
Integrity
-
Availability
-
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-02-27 CVE Reserved
  • 2024-02-28 CVE Published
  • 2024-02-29 EPSS Updated
  • 2024-08-04 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 5.12 < 5.12.4
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.12 < 5.12.4"
en
Affected
Linux
Search vendor "Linux"
 Linux Kernel
Search vendor "Linux" for product "Linux Kernel"
 >= 5.12 < 5.13
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.12 < 5.13"
en
Affected