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CVE-2024-35811

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 4.19.312, 5.4.274, 5.10.215, 5.15.154, 6.1.84, and 3 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

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]

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From e756af5b30b008f6ffcfebf8ad0b477f6f225b62 · fixed in 202c503935042272e2f9e1bb549d5f69a8681169; From e756af5b30b008f6ffcfebf8ad0b477f6f225b62 · fixed in 8e3f03f4ef7c36091f46e7349096efb5a2cdb3a1; From e756af5b30b008f6ffcfebf8ad0b477f6f225b62 · fixed in bacb8c3ab86dcd760c15903fcee58169bc3026aa; From e756af5b30b008f6ffcfebf8ad0b477f6f225b62 · fixed in 8c36205123dc57349b59b4f1a2301eb278cbc731; From e756af5b30b008f6ffcfebf8ad0b477f6f225b62 · fixed in 0b812f706fd7090be74812101114a0e165b36744; From e756af5b30b008f6ffcfebf8ad0b477f6f225b62 · fixed in 190794848e2b9d15de92d502b6ac652806904f5a; From e756af5b30b008f6ffcfebf8ad0b477f6f225b62 · fixed in 6678a1e7d896c00030b31491690e8ddc9a90767a; From e756af5b30b008f6ffcfebf8ad0b477f6f225b62 · fixed in 0a7591e14a8da794d0b93b5d1c6254ccb23adacb; From e756af5b30b008f6ffcfebf8ad0b477f6f225b62 · fixed in 0f7352557a35ab7888bc7831411ec8a3cbe20d78

  • Linux Linux

    3.7

  • KernelLinux

    From 3.7.0 · fixed in 4.19.312; From 4.20.0 · fixed in 5.4.274; From 5.5.0 · fixed in 5.10.215; From 5.11.0 · fixed in 5.15.154; From 5.16.0 · fixed in 6.1.84; From 6.2.0 · fixed in 6.6.24; From 6.7.0 · fixed in 6.7.12; From 6.8.0 · fixed in 6.8.3

References 9

git.kernel.org