CVE-2024-35811

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]

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxe756af5b30b008f6ffcfebf8ad0b477f6f225b62 < 202c503935042272e2f9e1bb549d5f69a8681169affected
LinuxLinuxe756af5b30b008f6ffcfebf8ad0b477f6f225b62 < 8e3f03f4ef7c36091f46e7349096efb5a2cdb3a1affected
LinuxLinuxe756af5b30b008f6ffcfebf8ad0b477f6f225b62 < bacb8c3ab86dcd760c15903fcee58169bc3026aaaffected
LinuxLinuxe756af5b30b008f6ffcfebf8ad0b477f6f225b62 < 8c36205123dc57349b59b4f1a2301eb278cbc731affected
LinuxLinuxe756af5b30b008f6ffcfebf8ad0b477f6f225b62 < 0b812f706fd7090be74812101114a0e165b36744affected
LinuxLinuxe756af5b30b008f6ffcfebf8ad0b477f6f225b62 < 190794848e2b9d15de92d502b6ac652806904f5aaffected
LinuxLinuxe756af5b30b008f6ffcfebf8ad0b477f6f225b62 < 6678a1e7d896c00030b31491690e8ddc9a90767aaffected
LinuxLinuxe756af5b30b008f6ffcfebf8ad0b477f6f225b62 < 0a7591e14a8da794d0b93b5d1c6254ccb23adacbaffected
LinuxLinuxe756af5b30b008f6ffcfebf8ad0b477f6f225b62 < 0f7352557a35ab7888bc7831411ec8a3cbe20d78affected
LinuxLinux3.7affected
LinuxLinux0 < 3.7unaffected
LinuxLinux4.19.312 <= 4.19.*unaffected
LinuxLinux5.4.274 <= 5.4.*unaffected
LinuxLinux5.10.215 <= 5.10.*unaffected
LinuxLinux5.15.154 <= 5.15.*unaffected
LinuxLinux6.1.84 <= 6.1.*unaffected
LinuxLinux6.6.24 <= 6.6.*unaffected
LinuxLinux6.7.12 <= 6.7.*unaffected
LinuxLinux6.8.3 <= 6.8.*unaffected
LinuxLinux6.9 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

Additional References

References