IM
IronMonkey Threat Research

CVE-2024-41006 MEDIUM

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

Description

In the Linux kernel, the following vulnerability has been resolved: netrom: Fix a memory leak in nr_heartbeat_expiry() syzbot reported a memory leak in nr_create() [0]. Commit 409db27e3a2e ("netrom: Fix use-after-free of a listening socket.") added sock_hold() to the nr_heartbeat_expiry() function, where a) a socket has a SOCK_DESTROY flag or b) a listening socket has a SOCK_DEAD flag. But in the case "a," when the SOCK_DESTROY flag is set, the file descriptor has already been closed and the nr_release() function has been called. So it makes no sense to hold the reference count because no one will call another nr_destroy_socket() and put it as in the case "b." nr_connect nr_establish_data_link nr_start_heartbeat nr_release switch (nr->state) case NR_STATE_3 nr->state = NR_STATE_2 sock_set_flag(sk, SOCK_DESTROY); nr_rx_frame nr_process_rx_frame switch (nr->state) case NR_STATE_2 nr_state2_machine() nr_disconnect() nr_sk(sk)->state = NR_STATE_0 sock_set_flag(sk, SOCK_DEAD) nr_heartbeat_expiry switch (nr->state) case NR_STATE_0 if (sock_flag(sk, SOCK_DESTROY) || (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) sock_hold() // ( !!! ) nr_destroy_socket() To fix the memory leak, let's call sock_hold() only for a listening socket. Found by InfoTeCS on behalf of Linux Verification Center (linuxtesting.org) with Syzkaller. [0]: https://syzkaller.appspot.com/bug?extid=d327a1f3b12e1e206c16

Additional Descriptions (1)

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: netrom: corrige una pérdida de memoria en nr_heartbeat_expiry() syzbot informó una pérdida de memoria en nr_create() [0]. El commit 409db27e3a2e ("netrom: Reparar el use-after-free de un socket de escucha") agregó sock_hold() a la función nr_heartbeat_expiry(), donde a) un socket tiene un indicador SOCK_DESTROY ob) un socket de escucha tiene un indicador SOCK_DEAD. Pero en el caso "a", cuando se establece el indicador SOCK_DESTROY, el descriptor de archivo ya se ha cerrado y se ha llamado a la función nr_release(). Por lo tanto, no tiene sentido mantener el recuento de referencias porque nadie llamará a otro nr_destroy_socket() y lo pondrá como en el caso "b". nr_connect nr_establecer_data_link nr_start_heartbeat nr_release interruptor (nr->estado) caso NR_STATE_3 nr->estado = NR_STATE_2 sock_set_flag(sk, SOCK_DESTROY); nr_rx_frame nr_process_rx_frame interruptor (nr->estado) caso NR_STATE_2 nr_state2_machine() nr_disconnect() nr_sk(sk)->estado = NR_STATE_0 sock_set_flag(sk, SOCK_DEAD) nr_heartbeat_expiry interruptor (nr->estado) caso NR_STATE_0 if (sock_flag(sk, OCK_DESTROY) || (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) sock_hold() // ( !!! ) nr_destroy_socket() Para solucionar la pérdida de memoria, llamemos a sock_hold() solo para un socket de escucha. Encontrado por InfoTeCS en nombre del Centro de verificación de Linux (linuxtesting.org) con Syzkaller. [0]: https://syzkaller.appspot.com/bug?extid=d327a1f3b12e1e206c16

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 0x7fd36b86c880> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd36b86f680> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd340ba0340> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd3686e5b00> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd36b86e100> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd36b86d080> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd370390900> Operating System
linux linux_kernel 6.10 <built-in method update of dict object at 0x7fd3686e59c0> Operating System
linux linux_kernel 6.10 <built-in method update of dict object at 0x7fd36b86fac0> Operating System
linux linux_kernel 6.10 <built-in method update of dict object at 0x7fd36b86de00> Operating System
linux linux_kernel 6.10 <built-in method update of dict object at 0x7fd36b8f8e80> 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:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:6.10:rc3:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:6.10:rc4:*:*:*:*:*:*

References