CVE-2024-35811

wifi: brcmfmac: Fix use-after-free bug in brcmf_cfg80211_detach

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: brcmfmac: Fix use-after-free bug in brcmf_cfg80211_detach

This is the candidate patch of CVE-2023-47233 :
https://nvd.nist.gov/vuln/detail/CVE-2023-47233

In brcm80211 driver,it starts with the following invoking chain
to start init a timeout worker:

->brcmf_usb_probe
->brcmf_usb_probe_cb
->brcmf_attach
->brcmf_bus_started
->brcmf_cfg80211_attach
->wl_init_priv
->brcmf_init_escan
->INIT_WORK(&cfg->escan_timeout_work,
brcmf_cfg80211_escan_timeout_worker);

If we disconnect the USB by hotplug, it will call
brcmf_usb_disconnect to make cleanup. The invoking chain is :

brcmf_usb_disconnect
->brcmf_usb_disconnect_cb
->brcmf_detach
->brcmf_cfg80211_detach
->kfree(cfg);

While the timeout woker may still be running. This will cause
a use-after-free bug on cfg in brcmf_cfg80211_escan_timeout_worker.

Fix it by deleting the timer and canceling the worker in
brcmf_cfg80211_detach.

[arend.vanspriel@broadcom.com: keep timer delete as is and cancel work just before free]

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: wifi: brcmfmac: corregido el error de use after free en brcmf_cfg80211_detach Este es el parche candidato de CVE-2023-47233: https://nvd.nist.gov/vuln/detail /CVE-2023-47233 En el controlador brcm80211, comienza con la siguiente cadena de invocación para iniciar un trabajador de tiempo de espera: ->brcmf_usb_probe ->brcmf_usb_probe_cb ->brcmf_attach ->brcmf_bus_started ->brcmf_cfg80211_attach ->wl_init_priv ->brcmf_init_escan ->INIT_WORK(&cfg ->escan_timeout_work, brcmf_cfg80211_escan_timeout_worker); Si desconectamos el USB mediante hotplug, llamará a brcmf_usb_disconnect para realizar la limpieza. La cadena de invocación es: brcmf_usb_disconnect ->brcmf_usb_disconnect_cb ->brcmf_detach ->brcmf_cfg80211_detach ->kfree(cfg); Mientras que el activador de tiempo de espera aún puede estar ejecutándose. Esto provocará un error de use after free en cfg en brcmf_cfg80211_escan_timeout_worker. Soluciónelo eliminando el temporizador y cancelando el trabajador en brcmf_cfg80211_detach. [arend.vanspriel@broadcom.com: mantenga la eliminación del temporizador tal como está y cancele el trabajo justo antes de liberarlo]

*Credits: N/A

CVSS Scores

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Scope

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* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2024-05-17 CVE Reserved
2024-05-17 CVE Published
2024-05-18 EPSS Updated
2024-11-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CAPEC

References (12)

URL	Tag	Source
https://git.kernel.org/stable/c/e756af5b30b008f6ffcfebf8ad0b477f6f225b62	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/202c503935042272e2f9e1bb549d5f69a8681169	2024-04-13
https://git.kernel.org/stable/c/8e3f03f4ef7c36091f46e7349096efb5a2cdb3a1	2024-04-13
https://git.kernel.org/stable/c/bacb8c3ab86dcd760c15903fcee58169bc3026aa	2024-04-13
https://git.kernel.org/stable/c/8c36205123dc57349b59b4f1a2301eb278cbc731	2024-04-10
https://git.kernel.org/stable/c/0b812f706fd7090be74812101114a0e165b36744	2024-04-03
https://git.kernel.org/stable/c/190794848e2b9d15de92d502b6ac652806904f5a	2024-04-03
https://git.kernel.org/stable/c/6678a1e7d896c00030b31491690e8ddc9a90767a	2024-04-03
https://git.kernel.org/stable/c/0a7591e14a8da794d0b93b5d1c6254ccb23adacb	2024-04-03
https://git.kernel.org/stable/c/0f7352557a35ab7888bc7831411ec8a3cbe20d78	2024-01-18

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"				>= 3.7 < 4.19.312 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.7 < 4.19.312"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.7 < 5.4.274 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.7 < 5.4.274"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.7 < 5.10.215 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.7 < 5.10.215"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.7 < 5.15.154 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.7 < 5.15.154"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.7 < 6.1.84 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.7 < 6.1.84"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.7 < 6.6.24 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.7 < 6.6.24"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.7 < 6.7.12 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.7 < 6.7.12"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.7 < 6.8.3 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.7 < 6.8.3"		en		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.7 < 6.9 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.7 < 6.9"		en		Affected