IM
IronMonkey Threat Research

CVE-2024-40942 MEDIUM

Published: 2024-07-12 | Last Modified: 2026-05-12 | Status: Modified

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: mesh: Fix leak of mesh_preq_queue objects The hwmp code use objects of type mesh_preq_queue, added to a list in ieee80211_if_mesh, to keep track of mpath we need to resolve. If the mpath gets deleted, ex mesh interface is removed, the entries in that list will never get cleaned. Fix this by flushing all corresponding items of the preq_queue in mesh_path_flush_pending(). This should take care of KASAN reports like this: unreferenced object 0xffff00000668d800 (size 128): comm "kworker/u8:4", pid 67, jiffies 4295419552 (age 1836.444s) hex dump (first 32 bytes): 00 1f 05 09 00 00 ff ff 00 d5 68 06 00 00 ff ff ..........h..... 8e 97 ea eb 3e b8 01 00 00 00 00 00 00 00 00 00 ....>........... backtrace: [<000000007302a0b6>] __kmem_cache_alloc_node+0x1e0/0x35c [<00000000049bd418>] kmalloc_trace+0x34/0x80 [<0000000000d792bb>] mesh_queue_preq+0x44/0x2a8 [<00000000c99c3696>] mesh_nexthop_resolve+0x198/0x19c [<00000000926bf598>] ieee80211_xmit+0x1d0/0x1f4 [<00000000fc8c2284>] __ieee80211_subif_start_xmit+0x30c/0x764 [<000000005926ee38>] ieee80211_subif_start_xmit+0x9c/0x7a4 [<000000004c86e916>] dev_hard_start_xmit+0x174/0x440 [<0000000023495647>] __dev_queue_xmit+0xe24/0x111c [<00000000cfe9ca78>] batadv_send_skb_packet+0x180/0x1e4 [<000000007bacc5d5>] batadv_v_elp_periodic_work+0x2f4/0x508 [<00000000adc3cd94>] process_one_work+0x4b8/0xa1c [<00000000b36425d1>] worker_thread+0x9c/0x634 [<0000000005852dd5>] kthread+0x1bc/0x1c4 [<000000005fccd770>] ret_from_fork+0x10/0x20 unreferenced object 0xffff000009051f00 (size 128): comm "kworker/u8:4", pid 67, jiffies 4295419553 (age 1836.440s) hex dump (first 32 bytes): 90 d6 92 0d 00 00 ff ff 00 d8 68 06 00 00 ff ff ..........h..... 36 27 92 e4 02 e0 01 00 00 58 79 06 00 00 ff ff 6'.......Xy..... backtrace: [<000000007302a0b6>] __kmem_cache_alloc_node+0x1e0/0x35c [<00000000049bd418>] kmalloc_trace+0x34/0x80 [<0000000000d792bb>] mesh_queue_preq+0x44/0x2a8 [<00000000c99c3696>] mesh_nexthop_resolve+0x198/0x19c [<00000000926bf598>] ieee80211_xmit+0x1d0/0x1f4 [<00000000fc8c2284>] __ieee80211_subif_start_xmit+0x30c/0x764 [<000000005926ee38>] ieee80211_subif_start_xmit+0x9c/0x7a4 [<000000004c86e916>] dev_hard_start_xmit+0x174/0x440 [<0000000023495647>] __dev_queue_xmit+0xe24/0x111c [<00000000cfe9ca78>] batadv_send_skb_packet+0x180/0x1e4 [<000000007bacc5d5>] batadv_v_elp_periodic_work+0x2f4/0x508 [<00000000adc3cd94>] process_one_work+0x4b8/0xa1c [<00000000b36425d1>] worker_thread+0x9c/0x634 [<0000000005852dd5>] kthread+0x1bc/0x1c4 [<000000005fccd770>] ret_from_fork+0x10/0x20

Additional Descriptions (1)

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: wifi: mac80211: mesh: corrige la fuga de objetos mesh_preq_queue El código hwmp usa objetos de tipo mesh_preq_queue, agregados a una lista en ieee80211_if_mesh, para realizar un seguimiento del mpath que necesitamos resolver. Si se elimina mpath, se elimina la interfaz ex mesh, las entradas en esa lista nunca se limpiarán. Solucione este problema eliminando todos los elementos correspondientes de preq_queue en mesh_path_flush_pending(). Esto debería encargarse de informes KASAN como este: objeto sin referencia 0xffff00000668d800 (tamaño 128): comm "kworker/u8:4", pid 67, jiffies 4295419552 (edad 1836.444s) volcado hexadecimal (primeros 32 bytes): 00 1f 05 09 00 00 ff ff 00 d5 68 06 00 00 ff ff ..........h..... 8e 97 ea eb 3e b8 01 00 00 00 00 00 00 00 00 00 ....&gt;.. ......... retroceso: [&lt;000000007302a0b6&gt;] __kmem_cache_alloc_node+0x1e0/0x35c [&lt;00000000049bd418&gt;] kmalloc_trace+0x34/0x80 [&lt;0000000000d792bb&gt;] 8 [&lt;00000000c99c3696&gt;] mesh_nexthop_resolve+0x198/ 0x19c [&lt;00000000926bf598&gt;] ieee80211_xmit+0x1d0/0x1f4 [&lt;00000000fc8c2284&gt;] __ieee80211_subif_start_xmit+0x30c/0x764 [&lt;000000005926ee38&gt;] 11_subif_start_xmit+0x9c/0x7a4 [&lt;000000004c86e916&gt;] dev_hard_start_xmit+0x174/0x440 [&lt;0000000023495647&gt;] __dev_queue_xmit+0xe24/ 0x111c [&lt;00000000cfe9ca78&gt;] batadv_send_skb_packet+0x180/0x1e4 [&lt;000000007bacc5d5&gt;] batadv_v_elp_periodic_work+0x2f4/0x508 [&lt;00000000adc3cd94&gt;] xa1c [&lt;00000000b36425d1&gt;] hilo_trabajador+0x9c/0x634 [&lt;0000000005852dd5&gt;] kthread+0x1bc/ 0x1c4 [&lt;000000005fccd770&gt;] ret_from_fork+0x10/0x20 objeto sin referencia 0xffff000009051f00 (tamaño 128): comm "kworker/u8:4", pid 67, jiffies 4295419553 (edad 1836.440s) volcado hexadecimal (primero 32 bytes): 90 d6 92 0d 00 00 ff ff 00 d8 68 06 00 00 ff ff ..........h..... 36 27 92 e4 02 e0 01 00 00 58 79 06 00 00 ff ff 6'.... ...Xy..... retroceso: [&lt;000000007302a0b6&gt;] __kmem_cache_alloc_node+0x1e0/0x35c [&lt;00000000049bd418&gt;] kmalloc_trace+0x34/0x80 [&lt;0000000000d792bb&gt;] 0x2a8 [&lt;00000000c99c3696&gt;] mesh_nexthop_resolve+0x198/ 0x19c [&lt;00000000926bf598&gt;] ieee80211_xmit+0x1d0/0x1f4 [&lt;00000000fc8c2284&gt;] __ieee80211_subif_start_xmit+0x30c/0x764 [&lt;000000005926ee38&gt;] 11_subif_start_xmit+0x9c/0x7a4 [&lt;000000004c86e916&gt;] dev_hard_start_xmit+0x174/0x440 [&lt;0000000023495647&gt;] __dev_queue_xmit+0xe24/ 0x111c [&lt;00000000cfe9ca78&gt;] batadv_send_skb_packet+0x180/0x1e4 [&lt;000000007bacc5d5&gt;] batadv_v_elp_periodic_work+0x2f4/0x508 [&lt;00000000adc3cd94&gt;] xa1c [&lt;00000000b36425d1&gt;] hilo_trabajador+0x9c/0x634 [&lt;0000000005852dd5&gt;] kthread+0x1bc/ 0x1c4 [&lt;000000005fccd770&gt;] ret_from_fork+0x10/0x20

CVSS Metrics

Base Score: 5.5 (MEDIUM)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack VectorLOCAL
Attack ComplexityLOW
Privileges RequiredLOW
User InteractionNONE
ScopeUNCHANGED
Confidentiality ImpactNONE
Integrity ImpactNONE
Availability ImpactHIGH

Source: [email protected]

Type: Primary

Exploitability Score: 1.8

Impact Score: 3.6

Weaknesses

Source Type Description
[email protected] Primary
en CWE-401

Affected Products

Vendor Product Version Update Type
linux linux_kernel * <built-in method update of dict object at 0x7fd370266980> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd340226040> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd3701cf780> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd34b8d8740> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd370264cc0> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd340224280> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd340227740> Operating System
linux linux_kernel 6.10 <built-in method update of dict object at 0x7fd340224a80> Operating System
linux linux_kernel 6.10 <built-in method update of dict object at 0x7fd340ad5a40> Operating System

Affected Configurations

Operator: OR

Vulnerable CPE
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:6.10:rc1:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:6.10:rc2:*:*:*:*:*:*

References