CVE-2024-36009

ax25: Fix netdev refcount issue

Severity Score

"-"

*CVSS v-

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

In the Linux kernel, the following vulnerability has been resolved:

ax25: Fix netdev refcount issue

The dev_tracker is added to ax25_cb in ax25_bind(). When the
ax25 device is detaching, the dev_tracker of ax25_cb should be
deallocated in ax25_kill_by_device() instead of the dev_tracker
of ax25_dev. The log reported by ref_tracker is shown below:

[ 80.884935] ref_tracker: reference already released.
[ 80.885150] ref_tracker: allocated in:
[ 80.885349] ax25_dev_device_up+0x105/0x540
[ 80.885730] ax25_device_event+0xa4/0x420
[ 80.885730] notifier_call_chain+0xc9/0x1e0
[ 80.885730] __dev_notify_flags+0x138/0x280
[ 80.885730] dev_change_flags+0xd7/0x180
[ 80.885730] dev_ifsioc+0x6a9/0xa30
[ 80.885730] dev_ioctl+0x4d8/0xd90
[ 80.885730] sock_do_ioctl+0x1c2/0x2d0
[ 80.885730] sock_ioctl+0x38b/0x4f0
[ 80.885730] __se_sys_ioctl+0xad/0xf0
[ 80.885730] do_syscall_64+0xc4/0x1b0
[ 80.885730] entry_SYSCALL_64_after_hwframe+0x67/0x6f
[ 80.885730] ref_tracker: freed in:
[ 80.885730] ax25_device_event+0x272/0x420
[ 80.885730] notifier_call_chain+0xc9/0x1e0
[ 80.885730] dev_close_many+0x272/0x370
[ 80.885730] unregister_netdevice_many_notify+0x3b5/0x1180
[ 80.885730] unregister_netdev+0xcf/0x120
[ 80.885730] sixpack_close+0x11f/0x1b0
[ 80.885730] tty_ldisc_kill+0xcb/0x190
[ 80.885730] tty_ldisc_hangup+0x338/0x3d0
[ 80.885730] __tty_hangup+0x504/0x740
[ 80.885730] tty_release+0x46e/0xd80
[ 80.885730] __fput+0x37f/0x770
[ 80.885730] __x64_sys_close+0x7b/0xb0
[ 80.885730] do_syscall_64+0xc4/0x1b0
[ 80.885730] entry_SYSCALL_64_after_hwframe+0x67/0x6f
[ 80.893739] ------------[ cut here ]------------
[ 80.894030] WARNING: CPU: 2 PID: 140 at lib/ref_tracker.c:255 ref_tracker_free+0x47b/0x6b0
[ 80.894297] Modules linked in:
[ 80.894929] CPU: 2 PID: 140 Comm: ax25_conn_rel_6 Not tainted 6.9.0-rc4-g8cd26fd90c1a #11
[ 80.895190] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qem4
[ 80.895514] RIP: 0010:ref_tracker_free+0x47b/0x6b0
[ 80.895808] Code: 83 c5 18 4c 89 eb 48 c1 eb 03 8a 04 13 84 c0 0f 85 df 01 00 00 41 83 7d 00 00 75 4b 4c 89 ff 9
[ 80.896171] RSP: 0018:ffff888009edf8c0 EFLAGS: 00000286
[ 80.896339] RAX: 1ffff1100141ac00 RBX: 1ffff1100149463b RCX: dffffc0000000000
[ 80.896502] RDX: 0000000000000001 RSI: 0000000000000246 RDI: ffff88800a0d6518
[ 80.896925] RBP: ffff888009edf9b0 R08: ffff88806d3288d3 R09: 1ffff1100da6511a
[ 80.897212] R10: dffffc0000000000 R11: ffffed100da6511b R12: ffff88800a4a31d4
[ 80.897859] R13: ffff88800a4a31d8 R14: dffffc0000000000 R15: ffff88800a0d6518
[ 80.898279] FS: 00007fd88b7fe700(0000) GS:ffff88806d300000(0000) knlGS:0000000000000000
[ 80.899436] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 80.900181] CR2: 00007fd88c001d48 CR3: 000000000993e000 CR4: 00000000000006f0
...
[ 80.935774] ref_tracker: sp%d@000000000bb9df3d has 1/1 users at
[ 80.935774] ax25_bind+0x424/0x4e0
[ 80.935774] __sys_bind+0x1d9/0x270
[ 80.935774] __x64_sys_bind+0x75/0x80
[ 80.935774] do_syscall_64+0xc4/0x1b0
[ 80.935774] entry_SYSCALL_64_after_hwframe+0x67/0x6f

Change ax25_dev->dev_tracker to the dev_tracker of ax25_cb
in order to mitigate the bug.

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: ax25: soluciona el problema de recuento de netdev. El dev_tracker se agrega a ax25_cb en ax25_bind(). Cuando el dispositivo ax25 se está desconectando, el dev_tracker de ax25_cb debe desasignarse en ax25_kill_by_device() en lugar del dev_tracker de ax25_dev. El registro informado por ref_tracker se muestra a continuación: [80.884935] ref_tracker: referencia ya publicada. [80.885150] ref_tracker: asignado en: [80.885349] ax25_dev_device_up+0x105/0x540 [80.885730] ax25_device_event+0xa4/0x420 [80.885730] notifier_call_chain+0xc9/0x1e0 [80. 885730] __dev_notify_flags+0x138/0x280 [ 80.885730] dev_change_flags+0xd7/0x180 [ 80.885730 ] dev_ifsioc+0x6a9/0xa30 [ 80.885730] dev_ioctl+0x4d8/0xd90 [ 80.885730] sock_do_ioctl+0x1c2/0x2d0 [ 80.885730] sock_ioctl+0x38b/0x4f0 [ 80.885730] __se_sys_ioctl+0xad/0xf0 [ 80.885730] do_syscall_64+0xc4/0x1b0 [ 80.885730] Entry_SYSCALL_64_after_hwframe +0x67/0x6f [ 80.885730] ref_tracker: liberado en: [ 80.885730] ax25_device_event+0x272/0x420 [ 80.885730] notifier_call_chain+0xc9/0x1e0 [ 80.885730] 370 [80.885730] unregister_netdevice_many_notify+0x3b5/0x1180 [80.885730] unregister_netdev+0xcf /0x120 [ 80.885730] sixpack_close+0x11f/0x1b0 [ 80.885730] tty_ldisc_kill+0xcb/0x190 [ 80.885730] tty_ldisc_hangup+0x338/0x3d0 [ 80.885730] x740 [ 80.885730] tty_release+0x46e/0xd80 [ 80.885730] __fput+0x37f/0x770 [80.885730] __x64_sys_close+0x7b/0xb0 [ 80.885730] do_syscall_64+0xc4/0x1b0 [ 80.885730] Entry_SYSCALL_64_after_hwframe+0x67/0x6f [ 80.893739] ------------[ cortar aquí ]--- ---- ----- [80.894030] ADVERTENCIA: CPU: 2 PID: 140 en lib/ref_tracker.c: 255 ref_tracker_free+0x47b/0x6b0 [80.894297] Módulos vinculados en: [80.894929] CPU: 2 pid: 140 Comm: ax25_conn_rel 6 no Tainted 6.9.0-rc4-g8cd26fd90c1a #11 [80.895190] Nombre del hardware: PC estándar QEMU (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qem4 [80.895514] RIP:ref_tracker_free +0x47b /0x6b0 [ 80.895808] Código: 83 c5 18 4c 89 eb 48 c1 eb 03 8a 04 13 84 c0 0f 85 df 01 00 00 41 83 7d 00 00 75 4b 4c 89 ff 9 [ 80.896171] 0018:ffff888009edf8c0 EFLAGS: 00000286 [ 80.896339] RAX: 1ffff1100141ac00 RBX: 1ffff1100149463b RCX: dffffc0000000000 [ 80.896502] RDX: 00000000000000001 RSI: 0000000000000246 RDI: ff88800a0d6518 [ 80.896925] RBP: ffff888009edf9b0 R08: ffff88806d3288d3 R09: 1ffff1100da6511a [ 80.897212] R10: dffffc0000000000 R11: 1b R12: ffff88800a4a31d4 [ 80.897859 ] R13: ffff88800a4a31d8 R14: dffffc0000000000 R15: ffff88800a0d6518 [ 80.898279] FS: 00007fd88b7fe700(0000) GS:ffff88806d300000(0000) 000000000000000 [ 80.899436] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 80.900181] CR2: 00007fd88c001d48 CR3 : 000000000993e000 CR4: 00000000000006f0 ... [ 80.935774] ref_tracker: sp%d@000000000bb9df3d tiene 1/1 usuarios en [ 80.935774] ax25_bind+0x424/0x4e0 [ 80.93577 4] __sys_bind+0x1d9/0x270 [ 80.935774] __x64_sys_bind+0x75/0x80 [ 80.935774 ] do_syscall_64+0xc4/0x1b0 [ 80.935774] Entry_SYSCALL_64_after_hwframe+0x67/0x6f Cambie ax25_dev->dev_tracker al dev_tracker de ax25_cb para mitigar el error.

*Credits: N/A

CVSS Scores

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-05-17 CVE Reserved
2024-05-20 CVE Published
2024-06-11 EPSS Updated
2024-08-02 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (12)

URL	Tag	Source
https://git.kernel.org/stable/c/feef318c855a361a1eccd880f33e88c460eb63b4	Vuln. Introduced
https://git.kernel.org/stable/c/b8c07f33aa35dacf5444e7053ed9662d1869f536	Vuln. Introduced
https://git.kernel.org/stable/c/b1e0a6fc7f17500484c402ad1cd018c24dfc14b3	Vuln. Introduced
https://git.kernel.org/stable/c/7528d0f2210c3a1154186175516ed37aa970f2b1	Vuln. Introduced
https://git.kernel.org/stable/c/57cc15f5fd550316e4104eaf84b90fbc640fd7a5	Vuln. Introduced
https://git.kernel.org/stable/c/b982492ec3a115e0a136856a1b2dbe32f2d21a0e	Vuln. Introduced
http://www.openwall.com/lists/oss-security/2024/05/30/1
http://www.openwall.com/lists/oss-security/2024/05/30/2

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/0d14f104027e30720582448706c7d6b43065c851	2024-05-02
https://git.kernel.org/stable/c/4fee8fa86a15d7790268eea458b1aec69c695530	2024-05-02
https://git.kernel.org/stable/c/c42b073d9af4a5329b25b17390c63ab3847f30e8	2024-05-02
https://git.kernel.org/stable/c/467324bcfe1a31ec65d0cf4aa59421d6b7a7d52b	2024-04-23

URL	Date	SRC

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"				>= 5.17 < 6.1.90 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.17 < 6.1.90"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.17 < 6.6.30 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.17 < 6.6.30"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.17 < 6.8.9 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.17 < 6.8.9"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.17 < 6.9 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.17 < 6.9"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				4.14.277 Search vendor "Linux" for product "Linux Kernel" and version "4.14.277"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				4.19.240 Search vendor "Linux" for product "Linux Kernel" and version "4.19.240"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				5.4.190 Search vendor "Linux" for product "Linux Kernel" and version "5.4.190"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				5.10.112 Search vendor "Linux" for product "Linux Kernel" and version "5.10.112"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				5.15.35 Search vendor "Linux" for product "Linux Kernel" and version "5.15.35"		en		Affected