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CVE-2024-35811

Disclosure Date: May 17, 2024 •
CVE-2024-35811
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Description

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]

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CVSS V3 Severity and Metrics
Base Score:
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Impact Score:
Unknown
Exploitability Score:
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Vector:
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Attack Vector (AV):
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Attack Complexity (AC):
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Privileges Required (PR):
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User Interaction (UI):
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Scope (S):
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Confidentiality (C):
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Integrity (I):
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Availability (A):
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General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
Linux 202c50393504
Linux not down converted
Prerequisites
Unknown
Discovered By
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PoC Author
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Metasploit Module
Unknown
Reporter
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Vendors

  • Linux

Products

  • Linux
Technical Analysis