// For flags

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

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

*Credits: N/A
CVSS Scores
Attack Vector
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Attack Complexity
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Privileges Required
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User Interaction
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Scope
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Confidentiality
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Integrity
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Availability
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* 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
  • 2024-11-08 EPSS Updated
  • 2024-11-19 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"
>= 5.19 < 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
Search vendor "Linux" for product "Linux Kernel" and version " >= 5.19 < 6.12"
en
Affected