CVE-2024-41006

CVE Details

Release Date:

2024-07-12

Description

In the Linux kernel, the following vulnerability has been resolved:\nnetrom: Fix a memory leak in nr_heartbeat_expiry()\nsyzbot reported a memory leak in nr_create() [0].\nCommit 409db27e3a2e ('netrom: Fix use-after-free of a listening socket.')\nadded sock_hold() to the nr_heartbeat_expiry() function, where\na) a socket has a SOCK_DESTROY flag or\nb) a listening socket has a SOCK_DEAD flag.\nBut in the case 'a,' when the SOCK_DESTROY flag is set, the file descriptor\nhas already been closed and the nr_release() function has been called.\nSo it makes no sense to hold the reference count because no one will\ncall another nr_destroy_socket() and put it as in the case 'b.'\nnr_connect\nnr_establish_data_link\nnr_start_heartbeat\nnr_release\nswitch (nr->state)\ncase NR_STATE_3\nnr->state = NR_STATE_2\nsock_set_flag(sk, SOCK_DESTROY);\nnr_rx_frame\nnr_process_rx_frame\nswitch (nr->state)\ncase NR_STATE_2\nnr_state2_machine()\nnr_disconnect()\nnr_sk(sk)->state = NR_STATE_0\nsock_set_flag(sk, SOCK_DEAD)\nnr_heartbeat_expiry\nswitch (nr->state)\ncase NR_STATE_0\nif (sock_flag(sk, SOCK_DESTROY) ||\n(sk->sk_state == TCP_LISTEN\n&& sock_flag(sk, SOCK_DEAD)))\nsock_hold() // ( !!! )\nnr_destroy_socket()\nTo fix the memory leak, let's call sock_hold() only for a listening socket.\nFound by InfoTeCS on behalf of Linux Verification Center\n(linuxtesting.org) with Syzkaller.\n[0]: https://syzkaller.appspot.com/bug?extid=d327a1f3b12e1e206c16

See more information about CVE-2024-41006 from MITRE CVE dictionary and NIST NVD

CVSS Scoring

NOTE: The following CVSS v3.1 metrics and score provided are preliminary and subject to review.

Base Score:	4.7	CVSS Vector:	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector:	Local network	Attack Complexity:	High
Privileges Required:	Low	User Interaction:	None
Scope:	Unchanged	Confidentiality Impact:	None
Integrity Impact:	None	Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 7 (kernel-uek)	ELSA-2024-12610	2024-09-10
Oracle Linux version 7 (kernel-uek)	ELSA-2024-12779	2024-10-11
Oracle Linux version 7 (kernel-uek-container)	ELSA-2024-12612	2024-09-11
Oracle Linux version 8 (kernel-uek)	ELSA-2024-12610	2024-09-10
Oracle Linux version 8 (kernel-uek)	ELSA-2024-12618	2024-09-12
Oracle Linux version 8 (kernel-uek-container)	ELSA-2024-12612	2024-09-11
Oracle Linux version 9 (kernel-uek)	ELSA-2024-12618	2024-09-12