CVE-2024-26896

wifi: wfx: fix memory leak when starting AP

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:

wifi: wfx: fix memory leak when starting AP

Kmemleak reported this error:

unreferenced object 0xd73d1180 (size 184):
comm "wpa_supplicant", pid 1559, jiffies 13006305 (age 964.245s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 1e 00 01 00 00 00 00 00 ................
backtrace:
[<5ca11420>] kmem_cache_alloc+0x20c/0x5ac
[<127bdd74>] __alloc_skb+0x144/0x170
[<fb8a5e38>] __netdev_alloc_skb+0x50/0x180
[<0f9fa1d5>] __ieee80211_beacon_get+0x290/0x4d4 [mac80211]
[<7accd02d>] ieee80211_beacon_get_tim+0x54/0x18c [mac80211]
[<41e25cc3>] wfx_start_ap+0xc8/0x234 [wfx]
[<93a70356>] ieee80211_start_ap+0x404/0x6b4 [mac80211]
[<a4a661cd>] nl80211_start_ap+0x76c/0x9e0 [cfg80211]
[<47bd8b68>] genl_rcv_msg+0x198/0x378
[<453ef796>] netlink_rcv_skb+0xd0/0x130
[<6b7c977a>] genl_rcv+0x34/0x44
[<66b2d04d>] netlink_unicast+0x1b4/0x258
[<f965b9b6>] netlink_sendmsg+0x1e8/0x428
[<aadb8231>] ____sys_sendmsg+0x1e0/0x274
[<d2b5212d>] ___sys_sendmsg+0x80/0xb4
[<69954f45>] __sys_sendmsg+0x64/0xa8
unreferenced object 0xce087000 (size 1024):
comm "wpa_supplicant", pid 1559, jiffies 13006305 (age 964.246s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
10 00 07 40 00 00 00 00 00 00 00 00 00 00 00 00 ...@............
backtrace:
[<9a993714>] __kmalloc_track_caller+0x230/0x600
[<f83ea192>] kmalloc_reserve.constprop.0+0x30/0x74
[<a2c61343>] __alloc_skb+0xa0/0x170
[<fb8a5e38>] __netdev_alloc_skb+0x50/0x180
[<0f9fa1d5>] __ieee80211_beacon_get+0x290/0x4d4 [mac80211]
[<7accd02d>] ieee80211_beacon_get_tim+0x54/0x18c [mac80211]
[<41e25cc3>] wfx_start_ap+0xc8/0x234 [wfx]
[<93a70356>] ieee80211_start_ap+0x404/0x6b4 [mac80211]
[<a4a661cd>] nl80211_start_ap+0x76c/0x9e0 [cfg80211]
[<47bd8b68>] genl_rcv_msg+0x198/0x378
[<453ef796>] netlink_rcv_skb+0xd0/0x130
[<6b7c977a>] genl_rcv+0x34/0x44
[<66b2d04d>] netlink_unicast+0x1b4/0x258
[<f965b9b6>] netlink_sendmsg+0x1e8/0x428
[<aadb8231>] ____sys_sendmsg+0x1e0/0x274
[<d2b5212d>] ___sys_sendmsg+0x80/0xb4

However, since the kernel is build optimized, it seems the stack is not
accurate. It appears the issue is related to wfx_set_mfp_ap(). The issue
is obvious in this function: memory allocated by ieee80211_beacon_get()
is never released. Fixing this leak makes kmemleak happy.

En el kernel de Linux, se resolvió la siguiente vulnerabilidad: wifi: wfx: corrige la pérdida de memoria al iniciar AP Kmemleak informó este error: objeto sin referencia 0xd73d1180 (tamaño 184): comm "wpa_supplicant", pid 1559, jiffies 13006305 (edad 964.245 s) volcado hexadecimal (primeros 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 1e 00 01 00 00 00 00 00 ................ rastreo inverso: [<5ca11420>] kmem_cache_alloc+0x20c/0x5ac [<127bdd74>] __alloc_skb+0x144/0x170 [] __netdev_alloc_skb +0x50/0x180 [<0f9fa1d5>] __ieee80211_beacon_get+0x290/0x4d4 [mac80211] [<7accd02d>] ieee80211_beacon_get_tim+0x54/0x18c [mac80211] [<41e25cc3>] 8/0x234 [wfx] [<93a70356>] ieee80211_start_ap+ 0x404/0x6b4 [mac80211] [] nl80211_start_ap+0x76c/0x9e0 [cfg80211] [<47bd8b68>] genl_rcv_msg+0x198/0x378 [<453ef796>] 130 [<6b7c977a>] genl_rcv+0x34/0x44 [ <66b2d04d>] netlink_unicast+0x1b4/0x258 [] netlink_sendmsg+0x1e8/0x428 [] ____sys_sendmsg+0x1e0/0x274 [] b4 [<69954f45>] __sys_sendmsg+0x64/0xa8 sin referencia Objeto 0xCE087000 (tamaño 1024): Comm "WPA_Supplicant", PID 1559, Jiffies 13006305 (Edad 964.246s) Volcado hexagonal (Primero 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ... ............ 10 00 07 40 00 00 00 00 00 00 00 00 00 00 00 00 ...@............ retroceso: [<9a993714> ] __kmalloc_track_caller+0x230/0x600 [] kmalloc_reserve.constprop.0+0x30/0x74 [] __alloc_skb+0xa0/0x170 [] __netdev_alloc_skb+0x50/0x180 9fa1d5>] __ieee80211_beacon_get+0x290/0x4d4 [mac80211] [<7accd02d>] ieee80211_beacon_get_tim+0x54/0x18c [mac80211] [<41e25cc3>] wfx_start_ap+0xc8/0x234 [wfx] [<93a70356>] ieee80211_start_ap+0x404/0x6b4 [ mac80211] [] nl80211_start_ap+0x76c /0x9e0 [cfg80211] [<47bd8b68>] genl_rcv_msg+0x198/0x378 [<453ef796>] netlink_rcv_skb+0xd0/0x130 [<6b7c977a>] genl_rcv+0x34/0x44 [<66b2d04d>] x1b4/0x258 [] netlink_sendmsg+0x1e8/0x428 [] ____sys_sendmsg+0x1e0/0x274 [] ___sys_sendmsg+0x80/0xb4 Sin embargo, dado que el kernel está optimizado, parece que la pila no es precisa. Parece que el problema está relacionado con wfx_set_mfp_ap(). El problema es obvio en esta función: la memoria asignada por ieee80211_beacon_get() nunca se libera. Arreglar esta fuga hace feliz a kmemleak.

*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

Total

* 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-125: Out-of-bounds Read

CAPEC

References (6)

URL	Tag	Source
https://git.kernel.org/stable/c/268bceec1684932e194ae87877dcc73f534d921c	Vuln. Introduced

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/stable/c/a1f57a0127b89a6b6620514564aa7eaec16d9af3	2024-03-26
https://git.kernel.org/stable/c/3a71ec74e5e3478d202a1874f085ca3ef40be49b	2024-03-26
https://git.kernel.org/stable/c/12f00a367b2b62756e0396f14b54c2c15524e1c3	2024-03-26
https://git.kernel.org/stable/c/dadbb5d29d6c5f571a50272fce8c1505a9559487	2024-03-26
https://git.kernel.org/stable/c/b8cfb7c819dd39965136a66fe3a7fde688d976fc	2024-02-06

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"				>= 5.10 < 6.1.83 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.10 < 6.1.83"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.10 < 6.6.23 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.10 < 6.6.23"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.10 < 6.7.11 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.10 < 6.7.11"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.10 < 6.8.2 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.10 < 6.8.2"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 5.10 < 6.9 Search vendor "Linux" for product "Linux Kernel" and version " >= 5.10 < 6.9"		en		Affected