CVE-2024-50133

LoongArch: Don't crash in stack_top() for tasks without vDSO

Severity Score

"-"

*CVSS v-

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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

LoongArch: Don't crash in stack_top() for tasks without vDSO

Not all tasks have a vDSO mapped, for example kthreads never do. If such
a task ever ends up calling stack_top(), it will derefence the NULL vdso
pointer and crash.

This can for example happen when using kunit:

[<9000000000203874>] stack_top+0x58/0xa8
[<90000000002956cc>] arch_pick_mmap_layout+0x164/0x220
[<90000000003c284c>] kunit_vm_mmap_init+0x108/0x12c
[<90000000003c1fbc>] __kunit_add_resource+0x38/0x8c
[<90000000003c2704>] kunit_vm_mmap+0x88/0xc8
[<9000000000410b14>] usercopy_test_init+0xbc/0x25c
[<90000000003c1db4>] kunit_try_run_case+0x5c/0x184
[<90000000003c3d54>] kunit_generic_run_threadfn_adapter+0x24/0x48
[<900000000022e4bc>] kthread+0xc8/0xd4
[<9000000000200ce8>] ret_from_kernel_thread+0xc/0xa4

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: LoongArch: No se bloquea en stack_top() para tareas sin vDSO No todas las tareas tienen un vDSO asignado, por ejemplo, kthreads nunca lo tiene. Si alguna vez una tarea de este tipo termina llamando a stack_top(), desreferenciará el puntero vdso NULL y se bloqueará. Esto puede suceder, por ejemplo, al usar kunit: [<9000000000203874>] stack_top+0x58/0xa8 [<90000000002956cc>] arch_pick_mmap_layout+0x164/0x220 [<90000000003c284c>] kunit_vm_mmap_init+0x108/0x12c [<90000000003c1fbc>] __kunit_add_resource+0x38/0x8c [<90000000003c2704>] kunit_vm_mmap+0x88/0xc8 [<9000000000410b14>] usercopy_test_init+0xbc/0x25c [<90000000003c1db4>] kunit_try_run_case+0x5c/0x184 [<90000000003c3d54>] kunit_generic_run_threadfn_adapter+0x24/0x48 [<900000000022e4bc>] kthread+0xc8/0xd4 [<9000000000200ce8>] ret_from_kernel_thread+0xc/0xa4

*Credits: N/A

CVSS Scores

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2024-10-21 CVE Reserved
2024-11-05 CVE Published
2024-11-05 CVE Updated
---------- EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (5)

URL	Tag	Source
https://git.kernel.org/stable/c/803b0fc5c3f2baa6e54978cd576407896f789b08	Vuln. Introduced

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/a67d4a02bf43e15544179895ede7d5f97b84b550	2024-11-01
https://git.kernel.org/stable/c/a94c197d4d749954dfaa37e907fcc8c04e4aad7e	2024-11-01
https://git.kernel.org/stable/c/041cc3860b06770357876d1114d615333b0fbf31	2024-11-01
https://git.kernel.org/stable/c/134475a9ab8487527238d270639a8cb74c10aab2	2024-10-21

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"				>= 5.19 < 6.1.115 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.19 < 6.1.115"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.19 < 6.6.59 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.19 < 6.6.59"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.19 < 6.11.6 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.19 < 6.11.6"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.19 < 6.12-rc5 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.19 < 6.12-rc5"		en		Affected