GHSA-VCQQ-2G47-GFP7
Vulnerability from github – Published: 2025-09-15 15:31 – Updated: 2025-11-25 18:32In the Linux kernel, the following vulnerability has been resolved:
wifi: brcmfmac: Fix potential stack-out-of-bounds in brcmf_c_preinit_dcmds()
This patch fixes a stack-out-of-bounds read in brcmfmac that occurs when 'buf' that is not null-terminated is passed as an argument of strsep() in brcmf_c_preinit_dcmds(). This buffer is filled with a firmware version string by memcpy() in brcmf_fil_iovar_data_get(). The patch ensures buf is null-terminated.
Found by a modified version of syzkaller.
[ 47.569679][ T1897] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43236b for chip BCM43236/3 [ 47.582839][ T1897] brcmfmac: brcmf_c_process_clm_blob: no clm_blob available (err=-2), device may have limited channels available [ 47.601565][ T1897] ================================================================== [ 47.602574][ T1897] BUG: KASAN: stack-out-of-bounds in strsep+0x1b2/0x1f0 [ 47.603447][ T1897] Read of size 1 at addr ffffc90001f6f000 by task kworker/0:2/1897 [ 47.604336][ T1897] [ 47.604621][ T1897] CPU: 0 PID: 1897 Comm: kworker/0:2 Tainted: G O 5.14.0+ #131 [ 47.605617][ T1897] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.org 04/01/2014 [ 47.606907][ T1897] Workqueue: usb_hub_wq hub_event [ 47.607453][ T1897] Call Trace: [ 47.607801][ T1897] dump_stack_lvl+0x8e/0xd1 [ 47.608295][ T1897] print_address_description.constprop.0.cold+0xf/0x334 [ 47.609009][ T1897] ? strsep+0x1b2/0x1f0 [ 47.609434][ T1897] ? strsep+0x1b2/0x1f0 [ 47.609863][ T1897] kasan_report.cold+0x83/0xdf [ 47.610366][ T1897] ? strsep+0x1b2/0x1f0 [ 47.610882][ T1897] strsep+0x1b2/0x1f0 [ 47.611300][ T1897] ? brcmf_fil_iovar_data_get+0x3a/0xf0 [ 47.611883][ T1897] brcmf_c_preinit_dcmds+0x995/0xc40 [ 47.612434][ T1897] ? brcmf_c_set_joinpref_default+0x100/0x100 [ 47.613078][ T1897] ? rcu_read_lock_sched_held+0xa1/0xd0 [ 47.613662][ T1897] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 47.614208][ T1897] ? lock_acquire+0x19d/0x4e0 [ 47.614704][ T1897] ? find_held_lock+0x2d/0x110 [ 47.615236][ T1897] ? brcmf_usb_deq+0x1a7/0x260 [ 47.615741][ T1897] ? brcmf_usb_rx_fill_all+0x5a/0xf0 [ 47.616288][ T1897] brcmf_attach+0x246/0xd40 [ 47.616758][ T1897] ? wiphy_new_nm+0x1703/0x1dd0 [ 47.617280][ T1897] ? kmemdup+0x43/0x50 [ 47.617720][ T1897] brcmf_usb_probe+0x12de/0x1690 [ 47.618244][ T1897] ? brcmf_usbdev_qinit.constprop.0+0x470/0x470 [ 47.618901][ T1897] usb_probe_interface+0x2aa/0x760 [ 47.619429][ T1897] ? usb_probe_device+0x250/0x250 [ 47.619950][ T1897] really_probe+0x205/0xb70 [ 47.620435][ T1897] ? driver_allows_async_probing+0x130/0x130 [ 47.621048][ T1897] __driver_probe_device+0x311/0x4b0 [ 47.621595][ T1897] ? driver_allows_async_probing+0x130/0x130 [ 47.622209][ T1897] driver_probe_device+0x4e/0x150 [ 47.622739][ T1897] __device_attach_driver+0x1cc/0x2a0 [ 47.623287][ T1897] bus_for_each_drv+0x156/0x1d0 [ 47.623796][ T1897] ? bus_rescan_devices+0x30/0x30 [ 47.624309][ T1897] ? lockdep_hardirqs_on_prepare+0x273/0x3e0 [ 47.624907][ T1897] ? trace_hardirqs_on+0x46/0x160 [ 47.625437][ T1897] __device_attach+0x23f/0x3a0 [ 47.625924][ T1897] ? device_bind_driver+0xd0/0xd0 [ 47.626433][ T1897] ? kobject_uevent_env+0x287/0x14b0 [ 47.627057][ T1897] bus_probe_device+0x1da/0x290 [ 47.627557][ T1897] device_add+0xb7b/0x1eb0 [ 47.628027][ T1897] ? wait_for_completion+0x290/0x290 [ 47.628593][ T1897] ? __fw_devlink_link_to_suppliers+0x5a0/0x5a0 [ 47.629249][ T1897] usb_set_configuration+0xf59/0x16f0 [ 47.629829][ T1897] usb_generic_driver_probe+0x82/0xa0 [ 47.630385][ T1897] usb_probe_device+0xbb/0x250 [ 47.630927][ T1897] ? usb_suspend+0x590/0x590 [ 47.631397][ T1897] really_probe+0x205/0xb70 [ 47.631855][ T1897] ? driver_allows_async_probing+0x130/0x130 [ 47.632469][ T1897] __driver_probe_device+0x311/0x4b0 [ 47.633002][ ---truncated---
{
"affected": [],
"aliases": [
"CVE-2022-50258"
],
"database_specific": {
"cwe_ids": [
"CWE-787"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-09-15T14:15:36Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: brcmfmac: Fix potential stack-out-of-bounds in brcmf_c_preinit_dcmds()\n\nThis patch fixes a stack-out-of-bounds read in brcmfmac that occurs\nwhen \u0027buf\u0027 that is not null-terminated is passed as an argument of\nstrsep() in brcmf_c_preinit_dcmds(). This buffer is filled with a firmware\nversion string by memcpy() in brcmf_fil_iovar_data_get().\nThe patch ensures buf is null-terminated.\n\nFound by a modified version of syzkaller.\n\n[ 47.569679][ T1897] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43236b for chip BCM43236/3\n[ 47.582839][ T1897] brcmfmac: brcmf_c_process_clm_blob: no clm_blob available (err=-2), device may have limited channels available\n[ 47.601565][ T1897] ==================================================================\n[ 47.602574][ T1897] BUG: KASAN: stack-out-of-bounds in strsep+0x1b2/0x1f0\n[ 47.603447][ T1897] Read of size 1 at addr ffffc90001f6f000 by task kworker/0:2/1897\n[ 47.604336][ T1897]\n[ 47.604621][ T1897] CPU: 0 PID: 1897 Comm: kworker/0:2 Tainted: G O 5.14.0+ #131\n[ 47.605617][ T1897] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.org 04/01/2014\n[ 47.606907][ T1897] Workqueue: usb_hub_wq hub_event\n[ 47.607453][ T1897] Call Trace:\n[ 47.607801][ T1897] dump_stack_lvl+0x8e/0xd1\n[ 47.608295][ T1897] print_address_description.constprop.0.cold+0xf/0x334\n[ 47.609009][ T1897] ? strsep+0x1b2/0x1f0\n[ 47.609434][ T1897] ? strsep+0x1b2/0x1f0\n[ 47.609863][ T1897] kasan_report.cold+0x83/0xdf\n[ 47.610366][ T1897] ? strsep+0x1b2/0x1f0\n[ 47.610882][ T1897] strsep+0x1b2/0x1f0\n[ 47.611300][ T1897] ? brcmf_fil_iovar_data_get+0x3a/0xf0\n[ 47.611883][ T1897] brcmf_c_preinit_dcmds+0x995/0xc40\n[ 47.612434][ T1897] ? brcmf_c_set_joinpref_default+0x100/0x100\n[ 47.613078][ T1897] ? rcu_read_lock_sched_held+0xa1/0xd0\n[ 47.613662][ T1897] ? rcu_read_lock_bh_held+0xb0/0xb0\n[ 47.614208][ T1897] ? lock_acquire+0x19d/0x4e0\n[ 47.614704][ T1897] ? find_held_lock+0x2d/0x110\n[ 47.615236][ T1897] ? brcmf_usb_deq+0x1a7/0x260\n[ 47.615741][ T1897] ? brcmf_usb_rx_fill_all+0x5a/0xf0\n[ 47.616288][ T1897] brcmf_attach+0x246/0xd40\n[ 47.616758][ T1897] ? wiphy_new_nm+0x1703/0x1dd0\n[ 47.617280][ T1897] ? kmemdup+0x43/0x50\n[ 47.617720][ T1897] brcmf_usb_probe+0x12de/0x1690\n[ 47.618244][ T1897] ? brcmf_usbdev_qinit.constprop.0+0x470/0x470\n[ 47.618901][ T1897] usb_probe_interface+0x2aa/0x760\n[ 47.619429][ T1897] ? usb_probe_device+0x250/0x250\n[ 47.619950][ T1897] really_probe+0x205/0xb70\n[ 47.620435][ T1897] ? driver_allows_async_probing+0x130/0x130\n[ 47.621048][ T1897] __driver_probe_device+0x311/0x4b0\n[ 47.621595][ T1897] ? driver_allows_async_probing+0x130/0x130\n[ 47.622209][ T1897] driver_probe_device+0x4e/0x150\n[ 47.622739][ T1897] __device_attach_driver+0x1cc/0x2a0\n[ 47.623287][ T1897] bus_for_each_drv+0x156/0x1d0\n[ 47.623796][ T1897] ? bus_rescan_devices+0x30/0x30\n[ 47.624309][ T1897] ? lockdep_hardirqs_on_prepare+0x273/0x3e0\n[ 47.624907][ T1897] ? trace_hardirqs_on+0x46/0x160\n[ 47.625437][ T1897] __device_attach+0x23f/0x3a0\n[ 47.625924][ T1897] ? device_bind_driver+0xd0/0xd0\n[ 47.626433][ T1897] ? kobject_uevent_env+0x287/0x14b0\n[ 47.627057][ T1897] bus_probe_device+0x1da/0x290\n[ 47.627557][ T1897] device_add+0xb7b/0x1eb0\n[ 47.628027][ T1897] ? wait_for_completion+0x290/0x290\n[ 47.628593][ T1897] ? __fw_devlink_link_to_suppliers+0x5a0/0x5a0\n[ 47.629249][ T1897] usb_set_configuration+0xf59/0x16f0\n[ 47.629829][ T1897] usb_generic_driver_probe+0x82/0xa0\n[ 47.630385][ T1897] usb_probe_device+0xbb/0x250\n[ 47.630927][ T1897] ? usb_suspend+0x590/0x590\n[ 47.631397][ T1897] really_probe+0x205/0xb70\n[ 47.631855][ T1897] ? driver_allows_async_probing+0x130/0x130\n[ 47.632469][ T1897] __driver_probe_device+0x311/0x4b0\n[ 47.633002][ \n---truncated---",
"id": "GHSA-vcqq-2g47-gfp7",
"modified": "2025-11-25T18:32:21Z",
"published": "2025-09-15T15:31:22Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50258"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0a06cadcc2a0044e4a117cc0e61436fc3a0dad69"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/17dbe90e13f52848c460d253f15b765038ec6dc0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3a3a5e3f94068cd562d62a57da6983c8cd07d53c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/881f50d76c3892262730ddf5c894eb00310e736c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/89243a7b0ea19606ba1c2873c9d569026ccb344f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ba166e0ebdde3dfa833f0a3edaf2b2934d4a87f7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d481fd6064bf215d7c5068e15aa390c3b16c9cd0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d6ef66194bb4a6c18f5b9649bf62597909b040e4"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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