CVE-2024-35995

ACPI: CPPC: Use access_width over bit_width for system memory accesses

Severity Score

"-"

*CVSS v-

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

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

ACPI: CPPC: Use access_width over bit_width for system memory accesses

To align with ACPI 6.3+, since bit_width can be any 8-bit value, it
cannot be depended on to be always on a clean 8b boundary. This was
uncovered on the Cobalt 100 platform.

SError Interrupt on CPU26, code 0xbe000011 -- SError
CPU: 26 PID: 1510 Comm: systemd-udevd Not tainted 5.15.2.1-13 #1
Hardware name: MICROSOFT CORPORATION, BIOS MICROSOFT CORPORATION
pstate: 62400009 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : cppc_get_perf_caps+0xec/0x410
lr : cppc_get_perf_caps+0xe8/0x410
sp : ffff8000155ab730
x29: ffff8000155ab730 x28: ffff0080139d0038 x27: ffff0080139d0078
x26: 0000000000000000 x25: ffff0080139d0058 x24: 00000000ffffffff
x23: ffff0080139d0298 x22: ffff0080139d0278 x21: 0000000000000000
x20: ffff00802b251910 x19: ffff0080139d0000 x18: ffffffffffffffff
x17: 0000000000000000 x16: ffffdc7e111bad04 x15: ffff00802b251008
x14: ffffffffffffffff x13: ffff013f1fd63300 x12: 0000000000000006
x11: ffffdc7e128f4420 x10: 0000000000000000 x9 : ffffdc7e111badec
x8 : ffff00802b251980 x7 : 0000000000000000 x6 : ffff0080139d0028
x5 : 0000000000000000 x4 : ffff0080139d0018 x3 : 00000000ffffffff
x2 : 0000000000000008 x1 : ffff8000155ab7a0 x0 : 0000000000000000
Kernel panic - not syncing: Asynchronous SError Interrupt
CPU: 26 PID: 1510 Comm: systemd-udevd Not tainted
5.15.2.1-13 #1
Hardware name: MICROSOFT CORPORATION, BIOS MICROSOFT CORPORATION
Call trace:
dump_backtrace+0x0/0x1e0
show_stack+0x24/0x30
dump_stack_lvl+0x8c/0xb8
dump_stack+0x18/0x34
panic+0x16c/0x384
add_taint+0x0/0xc0
arm64_serror_panic+0x7c/0x90
arm64_is_fatal_ras_serror+0x34/0xa4
do_serror+0x50/0x6c
el1h_64_error_handler+0x40/0x74
el1h_64_error+0x7c/0x80
cppc_get_perf_caps+0xec/0x410
cppc_cpufreq_cpu_init+0x74/0x400 [cppc_cpufreq]
cpufreq_online+0x2dc/0xa30
cpufreq_add_dev+0xc0/0xd4
subsys_interface_register+0x134/0x14c
cpufreq_register_driver+0x1b0/0x354
cppc_cpufreq_init+0x1a8/0x1000 [cppc_cpufreq]
do_one_initcall+0x50/0x250
do_init_module+0x60/0x27c
load_module+0x2300/0x2570
__do_sys_finit_module+0xa8/0x114
__arm64_sys_finit_module+0x2c/0x3c
invoke_syscall+0x78/0x100
el0_svc_common.constprop.0+0x180/0x1a0
do_el0_svc+0x84/0xa0
el0_svc+0x2c/0xc0
el0t_64_sync_handler+0xa4/0x12c
el0t_64_sync+0x1a4/0x1a8

Instead, use access_width to determine the size and use the offset and
width to shift and mask the bits to read/write out. Make sure to add a
check for system memory since pcc redefines the access_width to
subspace id.

If access_width is not set, then fall back to using bit_width.

[ rjw: Subject and changelog edits, comment adjustments ]

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ACPI: CPPC: use access_width sobre bit_width para accesos a la memoria del sistema. Para alinearse con ACPI 6.3+, dado que bit_width puede ser cualquier valor de 8 bits, no se puede depender de que esté siempre encendido. un límite limpio de 8b. Esto fue descubierto en la plataforma Cobalt 100. Interrupción de error en CPU26, código 0xbe000011 - CPU de SError: 26 PID: 1510 Comm: systemd-udevd Not tainted 5.15.2.1-13 #1 Nombre de hardware: MICROSOFT CORPORATION, BIOS MICROSOFT CORPORATION pstate: 62400009 (nZCv daif +PAN -UAO + TCO -DIT -SSBS BTYPE=--) pc: cppc_get_perf_caps+0xec/0x410 lr: cppc_get_perf_caps+0xe8/0x410 sp: ffff8000155ab730 x29: ffff8000155ab730 x28: ffff0080139d0038 x27: 0080139d0078 x26: 0000000000000000 x25: ffff0080139d0058 x24: 00000000ffffffff x23: ffff0080139d0298 x22: ffff0080139d0278 x21: 0000000000000000 x20: ffff00802b251910 x19: ffff0080139d0000 x18: ffffffffffffffff x17: 0000000000000000 x16: d04 x15: ffff00802b251008 x14: ffffffffffffffff x13: ffff013f1fd63300 x12: 0000000000000006 x11: ffffdc7e128f4420 x10: 0000000000000000 x9: ffffdc7 e111badec x8: ffff00802b251980 x7: 0000000000000000 x6: ffff0080139d0028 x5 : 0000000000000000 x4 : ffff0080139d0018 x3 : 00000000ffffffff x2 : 0000000000000008 x1 : ffff8000155ab7a0 x0 : 0000000000000000 Pánico del kernel - no se sincroniza: SError asíncrono Interrupción CPU: 26 PID: 1510 Comunicación: systemd-udevd No contaminado 5.15.2.1-13 #1 Nombre de hardware: MICROSOFT CORPORATION, BIOS MICROSOFT CORPORATION Rastreo de llamadas: dump_backtrace+0x0/0x1e0 show_stack+0x24/0x30 dump_stack_lvl+0x8c/0xb8 dump_stack+0x18/0x34 panic+0x16c/0x384 add_taint+0x0/0xc0 arm64_serror_panic+0x7c/0x9 0 arm64_is_fatal_ras_serror+0x34/0xa4 do_serror+ 0x50/0x6c el1h_64_error_handler+0x40/0x74 el1h_64_error+0x7c/0x80 cppc_get_perf_caps+0xec/0x410 cppc_cpufreq_cpu_init+0x74/0x400 [cppc_cpufreq] cpufreq_add_dev+0xc0/0xd4 subsys_interface_register+0x134/0x14c cpufreq_register_driver+0x1b0/0x354 cppc_cpufreq_init+0x1a8/ 0x1000 [cppc_cpufreq] do_one_initcall+0x50/0x250 do_init_module+0x60/0x27c load_module+0x2300/0x2570 __do_sys_finit_module+0xa8/0x114 __arm64_sys_finit_module+0x2c/0x3c invoke_ llamada al sistema+0x78/0x100 el0_svc_common.constprop.0+0x180/0x1a0 do_el0_svc+0x84/0xa0 el0_svc+ 0x2c/0xc0 el0t_64_sync_handler+0xa4/0x12c el0t_64_sync+0x1a4/0x1a8 En su lugar, use access_width para determinar el tamaño y use el desplazamiento y el ancho para desplazar y enmascarar los bits para leer/escribir. Asegúrese de agregar una verificación de la memoria del sistema, ya que pcc redefine el ancho de acceso al ID del subespacio. Si access_width no está configurado, vuelva a utilizar bit_width. [rjw: ediciones de asunto y registro de cambios, ajustes de comentarios]

*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

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-05-17 CVE Reserved
2024-05-20 CVE Published
2024-05-21 EPSS Updated
2024-08-02 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (7)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/4949affd5288b867cdf115f5b08d6166b2027f87	2024-04-10
https://git.kernel.org/stable/c/b54c4632946ae42f2b39ed38abd909bbf78cbcc2	2024-04-13
https://git.kernel.org/stable/c/6dfd79ed04c578f1d9a9a41ba5b2015cf9f03fc3	2024-05-17
https://git.kernel.org/stable/c/01fc53be672acae37e611c80cc0b4f3939584de3	2024-05-02
https://git.kernel.org/stable/c/1b890ae474d19800a6be1696df7fb4d9a41676e4	2024-05-02
https://git.kernel.org/stable/c/6cb6b12b78dcd8867a3fdbb1b6d0ed1df2b208d1	2024-05-02
https://git.kernel.org/stable/c/2f4a4d63a193be6fd530d180bb13c3592052904c	2024-03-05

URL	Date	SRC

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"				< 5.15.154 Search vendor "Linux" for product "Linux Kernel" and version " < 5.15.154"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.15.155 Search vendor "Linux" for product "Linux Kernel" and version " < 5.15.155"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 5.15.159 Search vendor "Linux" for product "Linux Kernel" and version " < 5.15.159"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 6.1.90 Search vendor "Linux" for product "Linux Kernel" and version " < 6.1.90"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 6.6.30 Search vendor "Linux" for product "Linux Kernel" and version " < 6.6.30"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 6.8.9 Search vendor "Linux" for product "Linux Kernel" and version " < 6.8.9"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 6.9 Search vendor "Linux" for product "Linux Kernel" and version " < 6.9"		en		Affected