CVE-2024-26859

net/bnx2x: Prevent access to a freed page in page_pool

Severity Score

4.1

*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:

net/bnx2x: Prevent access to a freed page in page_pool

Fix race condition leading to system crash during EEH error handling

During EEH error recovery, the bnx2x driver's transmit timeout logic
could cause a race condition when handling reset tasks. The
bnx2x_tx_timeout() schedules reset tasks via bnx2x_sp_rtnl_task(),
which ultimately leads to bnx2x_nic_unload(). In bnx2x_nic_unload()
SGEs are freed using bnx2x_free_rx_sge_range(). However, this could
overlap with the EEH driver's attempt to reset the device using
bnx2x_io_slot_reset(), which also tries to free SGEs. This race
condition can result in system crashes due to accessing freed memory
locations in bnx2x_free_rx_sge()

799 static inline void bnx2x_free_rx_sge(struct bnx2x *bp,
800 struct bnx2x_fastpath *fp, u16 index)
801 {
802 struct sw_rx_page *sw_buf = &fp->rx_page_ring[index];
803 struct page *page = sw_buf->page;
....
where sw_buf was set to NULL after the call to dma_unmap_page()
by the preceding thread.

EEH: Beginning: 'slot_reset'
PCI 0011:01:00.0#10000: EEH: Invoking bnx2x->slot_reset()
bnx2x: [bnx2x_io_slot_reset:14228(eth1)]IO slot reset initializing...
bnx2x 0011:01:00.0: enabling device (0140 -> 0142)
bnx2x: [bnx2x_io_slot_reset:14244(eth1)]IO slot reset --> driver unload
Kernel attempted to read user page (0) - exploit attempt? (uid: 0)
BUG: Kernel NULL pointer dereference on read at 0x00000000
Faulting instruction address: 0xc0080000025065fc
Oops: Kernel access of bad area, sig: 11 [#1]
.....
Call Trace:
[c000000003c67a20] [c00800000250658c] bnx2x_io_slot_reset+0x204/0x610 [bnx2x] (unreliable)
[c000000003c67af0] [c0000000000518a8] eeh_report_reset+0xb8/0xf0
[c000000003c67b60] [c000000000052130] eeh_pe_report+0x180/0x550
[c000000003c67c70] [c00000000005318c] eeh_handle_normal_event+0x84c/0xa60
[c000000003c67d50] [c000000000053a84] eeh_event_handler+0xf4/0x170
[c000000003c67da0] [c000000000194c58] kthread+0x1c8/0x1d0
[c000000003c67e10] [c00000000000cf64] ret_from_kernel_thread+0x5c/0x64

To solve this issue, we need to verify page pool allocations before
freeing.

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/bnx2x: impide el acceso a una página liberada en page_pool. Repara la condición de carrera que provoca un bloqueo del sistema durante el manejo de errores EEH. Durante la recuperación de errores EEH, la lógica de tiempo de espera de transmisión del controlador bnx2x podría provocar una carrera. condición al manejar tareas de reinicio. El bnx2x_tx_timeout() programa tareas de reinicio a través de bnx2x_sp_rtnl_task(), lo que finalmente conduce a bnx2x_nic_unload(). En bnx2x_nic_unload(), los SGE se liberan utilizando bnx2x_free_rx_sge_range(). Sin embargo, esto podría superponerse con el intento del controlador EEH de restablecer el dispositivo usando bnx2x_io_slot_reset(), que también intenta liberar los SGE. This race condition can result in system crashes due to accessing freed memory locations in bnx2x_free_rx_sge() 799 static inline void bnx2x_free_rx_sge(struct bnx2x *bp, 800 struct bnx2x_fastpath *fp, u16 index) 801 { 802 struct sw_rx_page *sw_buf = &fp->rx_page_ring [índice]; 803 página de estructura *página = sw_buf->página; .... donde sw_buf se configuró en NULL después de la llamada a dma_unmap_page() por el hilo anterior. EEH: Comienzo: 'slot_reset' PCI 0011:01:00.0#10000: EEH: Invocando bnx2x->slot_reset() bnx2x: [bnx2x_io_slot_reset:14228(eth1)]Reinicio de ranura IO inicializando... bnx2x 0011:01:00.0: habilitando dispositivo (0140 -> 0142) bnx2x: [bnx2x_io_slot_reset:14244(eth1)]Restablecimiento de ranura IO --> descarga del controlador El kernel intentó leer la página del usuario (0): ¿intento de explotación? (uid: 0) ERROR: Desreferencia del puntero NULL del kernel al leer en 0x00000000 Dirección de instrucción errónea: 0xc0080000025065fc Ups: Acceso al kernel del área defectuosa, firma: 11 [#1] ..... Seguimiento de llamadas: [c000000003c67a20] [c00800000250658c] 2x_io_slot_reset +0x204/0x610 [bnx2x] (no confiable) [c000000003c67af0] [c0000000000518a8] eeh_report_reset+0xb8/0xf0 [c000000003c67b60] [c000000000052130] 180/0x550 [c000000003c67c70] [c00000000005318c] eeh_handle_normal_event+0x84c/0xa60 [c000000003c67d50] [c000000000053a84] eeh_event_handler +0xf4/0x170 [c000000003c67da0] [c000000000194c58] kthread+0x1c8/0x1d0 [c000000003c67e10] [c00000000000cf64] ret_from_kernel_thread+0x5c/0x64 Para resolver este problema, necesitamos verifique las asignaciones del grupo de páginas antes de liberarlas.

*Credits: N/A

CVSS Scores

Red Hatv3.1 4.1

Attack Vector

Local

Attack Complexity

High

Privileges Required

High

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

2024-02-19 CVE Reserved
2024-04-17 CVE Published
2024-04-18 EPSS Updated
2024-08-02 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CAPEC

References (14)

URL	Tag	Source
https://git.kernel.org/stable/c/4cace675d687ebd2d813e90af80ff87ee85202f9	Vuln. Introduced
https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/7bcc090c81116c66936a7415f2c6b1483a4bcfd9	2024-03-26
https://git.kernel.org/stable/c/4f37d3a7e004bbf560c21441ca9c022168017ec4	2024-03-26
https://git.kernel.org/stable/c/8eebff95ce9558be66a36aa7cfb43223f3ab4699	2024-03-26
https://git.kernel.org/stable/c/8ffcd3ccdbda0c918c4a0f922ef1c17010f1b598	2024-03-26
https://git.kernel.org/stable/c/cf7d8cba639ae792a42c2a137b495eac262ac36c	2024-03-26
https://git.kernel.org/stable/c/3a9f78b297e08ca8e88ae3ecff1f6fe2766dc5eb	2024-03-26
https://git.kernel.org/stable/c/c51f8b6930db3f259b8820b589f2459d2df3fc68	2024-03-26
https://git.kernel.org/stable/c/44f9f1abb0ecc43023225ab9539167facbabf0ec	2024-03-26
https://git.kernel.org/stable/c/d27e2da94a42655861ca4baea30c8cd65546f25d	2024-03-20

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2024-26859	2024-07-08
https://bugzilla.redhat.com/show_bug.cgi?id=2275733	2024-07-08

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"				>= 4.2 < 4.19.311 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.2 < 4.19.311"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.2 < 5.4.273 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.2 < 5.4.273"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.2 < 5.10.214 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.2 < 5.10.214"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.2 < 5.15.153 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.2 < 5.15.153"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.2 < 6.1.83 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.2 < 6.1.83"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.2 < 6.6.23 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.2 < 6.6.23"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.2 < 6.7.11 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.2 < 6.7.11"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.2 < 6.8.2 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.2 < 6.8.2"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.2 < 6.9 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.2 < 6.9"		en		Affected