GHSA-M253-3J38-482H
Vulnerability from github – Published: 2024-05-17 15:31 – Updated: 2026-05-12 12:31In 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": [],
"aliases": [
"CVE-2024-35811"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-05-17T14:15:15Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: brcmfmac: Fix use-after-free bug in brcmf_cfg80211_detach\n\nThis is the candidate patch of CVE-2023-47233 :\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-47233\n\nIn brcm80211 driver,it starts with the following invoking chain\nto start init a timeout worker:\n\n-\u003ebrcmf_usb_probe\n -\u003ebrcmf_usb_probe_cb\n -\u003ebrcmf_attach\n -\u003ebrcmf_bus_started\n -\u003ebrcmf_cfg80211_attach\n -\u003ewl_init_priv\n -\u003ebrcmf_init_escan\n -\u003eINIT_WORK(\u0026cfg-\u003eescan_timeout_work,\n\t\t brcmf_cfg80211_escan_timeout_worker);\n\nIf we disconnect the USB by hotplug, it will call\nbrcmf_usb_disconnect to make cleanup. The invoking chain is :\n\nbrcmf_usb_disconnect\n -\u003ebrcmf_usb_disconnect_cb\n -\u003ebrcmf_detach\n -\u003ebrcmf_cfg80211_detach\n -\u003ekfree(cfg);\n\nWhile the timeout woker may still be running. This will cause\na use-after-free bug on cfg in brcmf_cfg80211_escan_timeout_worker.\n\nFix it by deleting the timer and canceling the worker in\nbrcmf_cfg80211_detach.\n\n[arend.vanspriel@broadcom.com: keep timer delete as is and cancel work just before free]",
"id": "GHSA-m253-3j38-482h",
"modified": "2026-05-12T12:31:46Z",
"published": "2024-05-17T15:31:09Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-35811"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0a7591e14a8da794d0b93b5d1c6254ccb23adacb"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0b812f706fd7090be74812101114a0e165b36744"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0f7352557a35ab7888bc7831411ec8a3cbe20d78"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/190794848e2b9d15de92d502b6ac652806904f5a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/202c503935042272e2f9e1bb549d5f69a8681169"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6678a1e7d896c00030b31491690e8ddc9a90767a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8c36205123dc57349b59b4f1a2301eb278cbc731"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8e3f03f4ef7c36091f46e7349096efb5a2cdb3a1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/bacb8c3ab86dcd760c15903fcee58169bc3026aa"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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