CVE-2024-40915

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2024-40915
In the Linux kernel, the following vulnerability has been resolved: riscv: rewrite __kernel_map_pages() to fix sleeping in invalid context __kernel_map_pages() is a debug function which clears the valid bit in page table entry for deallocated pages to detect illegal memory accesses to freed pages. This function set/clear the valid bit using __set_memory(). __set_memory() acquires init_mm's semaphore, and this operation may sleep. This is problematic, because __kernel_map_pages() can be called in atomic context, and thus is illegal to sleep. An example warning that this causes: BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1578 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 2, name: kthreadd preempt_count: 2, expected: 0 CPU: 0 PID: 2 Comm: kthreadd Not tainted 6.9.0-g1d4c6d784ef6 #37 Hardware name: riscv-virtio,qemu (DT) Call Trace: [<ffffffff800060dc>] dump_backtrace+0x1c/0x24 [<ffffffff8091ef6e>] show_stack+0x2c/0x38 [<ffffffff8092baf8>] dump_stack_lvl+0x5a/0x72 [<ffffffff8092bb24>] dump_stack+0x14/0x1c [<ffffffff8003b7ac>] __might_resched+0x104/0x10e [<ffffffff8003b7f4>] __might_sleep+0x3e/0x62 [<ffffffff8093276a>] down_write+0x20/0x72 [<ffffffff8000cf00>] __set_memory+0x82/0x2fa [<ffffffff8000d324>] __kernel_map_pages+0x5a/0xd4 [<ffffffff80196cca>] __alloc_pages_bulk+0x3b2/0x43a [<ffffffff8018ee82>] __vmalloc_node_range+0x196/0x6ba [<ffffffff80011904>] copy_process+0x72c/0x17ec [<ffffffff80012ab4>] kernel_clone+0x60/0x2fe [<ffffffff80012f62>] kernel_thread+0x82/0xa0 [<ffffffff8003552c>] kthreadd+0x14a/0x1be [<ffffffff809357de>] ret_from_fork+0xe/0x1c Rewrite this function with apply_to_existing_page_range(). It is fine to not have any locking, because __kernel_map_pages() works with pages being allocated/deallocated and those pages are not changed by anyone else in the meantime.

5.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://git.kernel.org/stable/c/8661a7af04991201640863ad1a0983173f84b5eb Patch
https://git.kernel.org/stable/c/919f8626099d9909b9a9620b05e8c8ab06581876 Patch
https://git.kernel.org/stable/c/d5257ceb19d92069195254866421f425aea42915 Patch
https://git.kernel.org/stable/c/fb1cf0878328fe75d47f0aed0a65b30126fcefc4 Patch
https://git.kernel.org/stable/c/8661a7af04991201640863ad1a0983173f84b5eb Patch
https://git.kernel.org/stable/c/919f8626099d9909b9a9620b05e8c8ab06581876 Patch
https://git.kernel.org/stable/c/d5257ceb19d92069195254866421f425aea42915 Patch
https://git.kernel.org/stable/c/fb1cf0878328fe75d47f0aed0a65b30126fcefc4 Patch
Configurations

Configuration 1 (hide)

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

17 Sep 2025, 15:32

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 5.5
First Time Linux
Linux linux Kernel
CWE CWE-667
References () https://git.kernel.org/stable/c/8661a7af04991201640863ad1a0983173f84b5eb - () https://git.kernel.org/stable/c/8661a7af04991201640863ad1a0983173f84b5eb - Patch
References () https://git.kernel.org/stable/c/919f8626099d9909b9a9620b05e8c8ab06581876 - () https://git.kernel.org/stable/c/919f8626099d9909b9a9620b05e8c8ab06581876 - Patch
References () https://git.kernel.org/stable/c/d5257ceb19d92069195254866421f425aea42915 - () https://git.kernel.org/stable/c/d5257ceb19d92069195254866421f425aea42915 - Patch
References () https://git.kernel.org/stable/c/fb1cf0878328fe75d47f0aed0a65b30126fcefc4 - () https://git.kernel.org/stable/c/fb1cf0878328fe75d47f0aed0a65b30126fcefc4 - Patch
CPE cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

21 Nov 2024, 09:31

Type Values Removed Values Added
References () https://git.kernel.org/stable/c/8661a7af04991201640863ad1a0983173f84b5eb - () https://git.kernel.org/stable/c/8661a7af04991201640863ad1a0983173f84b5eb -
References () https://git.kernel.org/stable/c/919f8626099d9909b9a9620b05e8c8ab06581876 - () https://git.kernel.org/stable/c/919f8626099d9909b9a9620b05e8c8ab06581876 -
References () https://git.kernel.org/stable/c/d5257ceb19d92069195254866421f425aea42915 - () https://git.kernel.org/stable/c/d5257ceb19d92069195254866421f425aea42915 -
References () https://git.kernel.org/stable/c/fb1cf0878328fe75d47f0aed0a65b30126fcefc4 - () https://git.kernel.org/stable/c/fb1cf0878328fe75d47f0aed0a65b30126fcefc4 -
Summary
  • (es) En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: riscv: reescribe __kernel_map_pages() para arreglar el modo de dormir en un contexto no válido. __kernel_map_pages() es una función de depuración que borra el bit válido en la entrada de la tabla de páginas para páginas designadas para detectar accesos ilegales a la memoria de las páginas liberadas. Esta función establece/borra el bit válido usando __set_memory(). __set_memory() adquiere el semáforo de init_mm y esta operación puede suspenderse. Esto es problemático, porque __kernel_map_pages() se puede llamar en un contexto atómico y, por lo tanto, es ilegal dormir. Un ejemplo de advertencia de que esto causa: ERROR: función inactiva llamada desde un contexto no válido en kernel/locking/rwsem.c:1578 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 2, nombre: kthreadd preempt_count: 2, esperado: 0 CPU: 0 PID: 2 Comm: kthreadd No contaminado 6.9.0-g1d4c6d784ef6 #37 Nombre de hardware: riscv-virtio,qemu (DT) Seguimiento de llamadas: [] dump_backtrace+0x1c/0x24 [] show_stack+0x2c/0x38 [] dump_stack_lvl+0x5a/0x72 [] dump_stack+0x14/0x1c [] __might_resched+0x104/0x10e [] __might_sleep+0x3e/0x62 [] down_write+0x20/0x72 [] __set_memory+0x82/0x2fa [] __kernel_map_pages+0x5a/0xd4 [] __alloc_pages_bulk+0x3b2/0x43a [] __vmalloc_node_range+0x196/0x6ba [] copy_process+0x72c/0x17ec [] kernel_clone+0x60/0x2fe [] kernel_thread+0x82/0xa0 [] kthreadd+0x14a/0x1be [] _from_fork+0xe/0x1c Reescribe esta función con apply_to_existing_page_range(). Está bien no tener ningún bloqueo, porque __kernel_map_pages() funciona con páginas que se asignan/desasignan y, mientras tanto, nadie más cambia esas páginas.

12 Jul 2024, 16:34

Type Values Removed Values Added
New CVE
Information

Published : 2024-07-12 13:15

Updated : 2025-09-17 15:32

NVD link : CVE-2024-40915

Mitre link : CVE-2024-40915

CVE.ORG link : CVE-2024-40915

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-667

Improper Locking