CVE-2024-27399

Bluetooth: l2cap: fix null-ptr-deref in l2cap_chan_timeout

Severity Score

5.5

*CVSS v3.1

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:

Bluetooth: l2cap: fix null-ptr-deref in l2cap_chan_timeout

There is a race condition between l2cap_chan_timeout() and
l2cap_chan_del(). When we use l2cap_chan_del() to delete the
channel, the chan->conn will be set to null. But the conn could
be dereferenced again in the mutex_lock() of l2cap_chan_timeout().
As a result the null pointer dereference bug will happen. The
KASAN report triggered by POC is shown below:

[ 472.074580] ==================================================================
[ 472.075284] BUG: KASAN: null-ptr-deref in mutex_lock+0x68/0xc0
[ 472.075308] Write of size 8 at addr 0000000000000158 by task kworker/0:0/7
[ 472.075308]
[ 472.075308] CPU: 0 PID: 7 Comm: kworker/0:0 Not tainted 6.9.0-rc5-00356-g78c0094a146b #36
[ 472.075308] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu4
[ 472.075308] Workqueue: events l2cap_chan_timeout
[ 472.075308] Call Trace:
[ 472.075308] <TASK>
[ 472.075308] dump_stack_lvl+0x137/0x1a0
[ 472.075308] print_report+0x101/0x250
[ 472.075308] ? __virt_addr_valid+0x77/0x160
[ 472.075308] ? mutex_lock+0x68/0xc0
[ 472.075308] kasan_report+0x139/0x170
[ 472.075308] ? mutex_lock+0x68/0xc0
[ 472.075308] kasan_check_range+0x2c3/0x2e0
[ 472.075308] mutex_lock+0x68/0xc0
[ 472.075308] l2cap_chan_timeout+0x181/0x300
[ 472.075308] process_one_work+0x5d2/0xe00
[ 472.075308] worker_thread+0xe1d/0x1660
[ 472.075308] ? pr_cont_work+0x5e0/0x5e0
[ 472.075308] kthread+0x2b7/0x350
[ 472.075308] ? pr_cont_work+0x5e0/0x5e0
[ 472.075308] ? kthread_blkcg+0xd0/0xd0
[ 472.075308] ret_from_fork+0x4d/0x80
[ 472.075308] ? kthread_blkcg+0xd0/0xd0
[ 472.075308] ret_from_fork_asm+0x11/0x20
[ 472.075308] </TASK>
[ 472.075308] ==================================================================
[ 472.094860] Disabling lock debugging due to kernel taint
[ 472.096136] BUG: kernel NULL pointer dereference, address: 0000000000000158
[ 472.096136] #PF: supervisor write access in kernel mode
[ 472.096136] #PF: error_code(0x0002) - not-present page
[ 472.096136] PGD 0 P4D 0
[ 472.096136] Oops: 0002 [#1] PREEMPT SMP KASAN NOPTI
[ 472.096136] CPU: 0 PID: 7 Comm: kworker/0:0 Tainted: G B 6.9.0-rc5-00356-g78c0094a146b #36
[ 472.096136] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu4
[ 472.096136] Workqueue: events l2cap_chan_timeout
[ 472.096136] RIP: 0010:mutex_lock+0x88/0xc0
[ 472.096136] Code: be 08 00 00 00 e8 f8 23 1f fd 4c 89 f7 be 08 00 00 00 e8 eb 23 1f fd 42 80 3c 23 00 74 08 48 88
[ 472.096136] RSP: 0018:ffff88800744fc78 EFLAGS: 00000246
[ 472.096136] RAX: 0000000000000000 RBX: 1ffff11000e89f8f RCX: ffffffff8457c865
[ 472.096136] RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88800744fc78
[ 472.096136] RBP: 0000000000000158 R08: ffff88800744fc7f R09: 1ffff11000e89f8f
[ 472.096136] R10: dffffc0000000000 R11: ffffed1000e89f90 R12: dffffc0000000000
[ 472.096136] R13: 0000000000000158 R14: ffff88800744fc78 R15: ffff888007405a00
[ 472.096136] FS: 0000000000000000(0000) GS:ffff88806d200000(0000) knlGS:0000000000000000
[ 472.096136] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 472.096136] CR2: 0000000000000158 CR3: 000000000da32000 CR4: 00000000000006f0
[ 472.096136] Call Trace:
[ 472.096136] <TASK>
[ 472.096136] ? __die_body+0x8d/0xe0
[ 472.096136] ? page_fault_oops+0x6b8/0x9a0
[ 472.096136] ? kernelmode_fixup_or_oops+0x20c/0x2a0
[ 472.096136] ? do_user_addr_fault+0x1027/0x1340
[ 472.096136] ? _printk+0x7a/0xa0
[ 472.096136] ? mutex_lock+0x68/0xc0
[ 472.096136] ? add_taint+0x42/0xd0
[ 472.096136] ? exc_page_fault+0x6a/0x1b0
[ 472.096136] ? asm_exc_page_fault+0x26/0x30
[ 472.096136] ? mutex_lock+0x75/0xc0
[ 472.096136] ? mutex_lock+0x88/0xc0
[ 472.096136] ? mutex_lock+0x75/0xc0
[ 472.096136] l2cap_chan_timeo
---truncated---

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Bluetooth: l2cap: corrige null-ptr-deref en l2cap_chan_timeout Existe una condición de ejecución entre l2cap_chan_timeout() y l2cap_chan_del(). Cuando usamos l2cap_chan_del() para eliminar el canal, chan->conn se establecerá en nulo. Pero se podría desreferenciar la conexión nuevamente en mutex_lock() de l2cap_chan_timeout(). Como resultado, se producirá el error de desreferencia del puntero nulo. El informe KASAN activado por POC se muestra a continuación: [472.074580] ====================================== ============================= [472.075284] ERROR: KASAN: null-ptr-deref en mutex_lock+0x68/0xc0 [472.075308] Escritura de tamaño 8 en la dirección 0000000000000158 mediante tarea kworker/0:0/7 [ 472.075308] [ 472.075308] CPU: 0 PID: 7 Comm: kworker/0:0 Not tainted 6.9.0-rc5-00356-g78c0094a146b #36 [ 472. 075308 ] Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu4 [ 472.075308] Cola de trabajo: eventos l2cap_chan_timeout [ 472.075308] Seguimiento de llamadas: [ 472.075308] [ 4 72.075308 ] dump_stack_lvl+0x137/0x1a0 [ 472.075308] print_report+0x101/0x250 [ 472.075308] ? __virt_addr_valid+0x77/0x160 [472.075308] ? mutex_lock+0x68/0xc0 [ 472.075308] kasan_report+0x139/0x170 [ 472.075308] ? mutex_lock+0x68/0xc0 [ 472.075308] kasan_check_range+0x2c3/0x2e0 [ 472.075308] mutex_lock+0x68/0xc0 [ 472.075308] l2cap_chan_timeout+0x181/0x300 [ 472.075308] +0x5d2/0xe00 [ 472.075308] hilo_trabajador+0xe1d/0x1660 [ 472.075308] ? pr_cont_work+0x5e0/0x5e0 [ 472.075308] kthread+0x2b7/0x350 [ 472.075308] ? pr_cont_work+0x5e0/0x5e0 [472.075308]? kthread_blkcg+0xd0/0xd0 [ 472.075308] ret_from_fork+0x4d/0x80 [ 472.075308] ? kthread_blkcg+0xd0/0xd0 [ 472.075308] ret_from_fork_asm+0x11/0x20 [ 472.075308] [ 472.075308] ============================ ======================================= [ 472.094860] Deshabilitar la depuración de bloqueo debido a la corrupción del kernel [ 472.096136] ERROR: desreferencia del puntero NULL del kernel, dirección: 0000000000000158 [ 472.096136] #PF: acceso de escritura del supervisor en modo kernel [ 472.096136] #PF: error_code(0x0002) - página no presente [ 472.096136] PGD 0 P4D 0 [ 4 72.096136] Ups : 0002 [#1] PREEMPT SMP KASAN NOPTI [ 472.096136] CPU: 0 PID: 7 Comm: kworker/0:0 Contaminado: GB 6.9.0-rc5-00356-g78c0094a146b #36 [ 472.096136] Nombre de hardware: PC estándar QEMU ( i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu4 [ 472.096136] Cola de trabajo: eventos l2cap_chan_timeout [ 472.096136] RIP: 0010:mutex_lock+0x88/0xc0 [ 472.09613 6] Código: ser 08 00 00 00 e8 f8 23 1f fd 4c 89 f7 be 08 00 00 00 e8 eb 23 1f fd 42 80 3c 23 00 74 08 48 88 [ 472.096136] RSP: 0018:ffff88800744fc78 EFLAGS: 00000246 [ 472.096136] RAX: 0000000000000000 RBX: 1ffff11000e89f8f RCX: ffffffff8457c865 [ 472.096136] RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88800744fc78 [ 472.096136] RBP: 0000000000000158 R08: ffff88800744fc7 f R09: 1ffff11000e89f8f [ 472.096136] R10: dffffc0000000000 R11: ffffed1000e89f90 R12: dffffc0000000000 [ 472.096136] R13: 0000000000000158 : ffff88800744fc78 R15: ffff888007405a00 [ 472.096136 ] FS: 0000000000000000(0000) GS:ffff88806d200000(0000) knlGS:0000000000000000 [ 472.096136] CS: 0010 DS: 0000 ES: 0000 CR0: 00000000800500 33 [ 472.096136] CR2: 0000000000000158 CR3: 000000000da32000 CR4: 00000000000006f0 [ 472.096136] Seguimiento de llamadas: [ 472.096136] [ 472.096136] ? __die_body+0x8d/0xe0 [ 472.096136] ? page_fault_oops+0x6b8/0x9a0 [472.096136]? kernelmode_fixup_or_oops+0x20c/0x2a0 [472.096136]? do_user_addr_fault+0x1027/0x1340 [472.096136]? _printk+0x7a/0xa0 [ 472.096136] ? mutex_lock+0x68/0xc0 [472.096136]? add_taint+0x42/0xd0 [472.096136]? exc_page_fault+0x6a/0x1b0 [472.096136]? asm_exc_page_fault+0x26/0x30 [472.096136]? mutex_lock+0x75/0xc0 [472.096136]? mutex_lock+0x88/0xc0 [472.096136]? mutex_lock+0x75/0xc0 [472.096136] l2cap_chan_timeo ---truncado---

*Credits: N/A

CVSS Scores

Red Hatv3.1 5.5

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-02-25 CVE Reserved
2024-05-13 CVE Published
2024-06-28 EPSS Updated
2024-09-26 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (15)

URL	Tag	Source
https://git.kernel.org/stable/c/3df91ea20e744344100b10ae69a17211fcf5b207	Vuln. Introduced
https://lists.debian.org/debian-lts-announce/2024/06/msg00019.html
https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DW2MIOIMOFUSNLHLRYX23AFR36BMKD65
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OTB4HWU2PTVW5NEYHHLOCXDKG3PYA534

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/e137e2ba96e51902dc2878131823a96bf8e638ae	2024-05-17
https://git.kernel.org/stable/c/6466ee65e5b27161c846c73ef407f49dfa1bd1d9	2024-05-17
https://git.kernel.org/stable/c/06acb75e7ed600d0bbf7bff5628aa8f24a97978c	2024-05-17
https://git.kernel.org/stable/c/e97e16433eb4533083b096a3824b93a5ca3aee79	2024-05-17
https://git.kernel.org/stable/c/8960ff650aec70485b40771cd8e6e8c4cb467d33	2024-05-17
https://git.kernel.org/stable/c/955b5b6c54d95b5e7444dfc81c95c8e013f27ac0	2024-05-17
https://git.kernel.org/stable/c/eb86f955488c39526534211f2610e48a5cf8ead4	2024-05-17
https://git.kernel.org/stable/c/adf0398cee86643b8eacde95f17d073d022f782c	2024-05-03

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2024-27399	2024-09-24
https://bugzilla.redhat.com/show_bug.cgi?id=2280462	2024-09-24

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"				>= 3.4 < 4.19.314 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.4 < 4.19.314"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.4 < 5.4.276 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.4 < 5.4.276"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.4 < 5.10.217 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.4 < 5.10.217"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.4 < 5.15.159 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.4 < 5.15.159"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.4 < 6.1.91 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.4 < 6.1.91"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.4 < 6.6.31 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.4 < 6.6.31"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.4 < 6.8.10 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.4 < 6.8.10"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.4 < 6.9 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.4 < 6.9"		en		Affected