GHSA-F429-W42V-Q89C
Vulnerability from github – Published: 2026-03-25 12:30 – Updated: 2026-05-22 03:30In the Linux kernel, the following vulnerability has been resolved:
wifi: libertas: fix use-after-free in lbs_free_adapter()
The lbs_free_adapter() function uses timer_delete() (non-synchronous) for both command_timer and tx_lockup_timer before the structure is freed. This is incorrect because timer_delete() does not wait for any running timer callback to complete.
If a timer callback is executing when lbs_free_adapter() is called, the callback will access freed memory since lbs_cfg_free() frees the containing structure immediately after lbs_free_adapter() returns.
Both timer callbacks (lbs_cmd_timeout_handler and lbs_tx_lockup_handler) access priv->driver_lock, priv->cur_cmd, priv->dev, and other fields, which would all be use-after-free violations.
Use timer_delete_sync() instead to ensure any running timer callback has completed before returning.
This bug was introduced in commit 8f641d93c38a ("libertas: detect TX lockups and reset hardware") where del_timer() was used instead of del_timer_sync() in the cleanup path. The command_timer has had the same issue since the driver was first written.
{
"affected": [],
"aliases": [
"CVE-2026-23281"
],
"database_specific": {
"cwe_ids": [
"CWE-416"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-03-25T11:16:22Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: libertas: fix use-after-free in lbs_free_adapter()\n\nThe lbs_free_adapter() function uses timer_delete() (non-synchronous)\nfor both command_timer and tx_lockup_timer before the structure is\nfreed. This is incorrect because timer_delete() does not wait for\nany running timer callback to complete.\n\nIf a timer callback is executing when lbs_free_adapter() is called,\nthe callback will access freed memory since lbs_cfg_free() frees the\ncontaining structure immediately after lbs_free_adapter() returns.\n\nBoth timer callbacks (lbs_cmd_timeout_handler and lbs_tx_lockup_handler)\naccess priv-\u003edriver_lock, priv-\u003ecur_cmd, priv-\u003edev, and other fields,\nwhich would all be use-after-free violations.\n\nUse timer_delete_sync() instead to ensure any running timer callback\nhas completed before returning.\n\nThis bug was introduced in commit 8f641d93c38a (\"libertas: detect TX\nlockups and reset hardware\") where del_timer() was used instead of\ndel_timer_sync() in the cleanup path. The command_timer has had the\nsame issue since the driver was first written.",
"id": "GHSA-f429-w42v-q89c",
"modified": "2026-05-22T03:30:25Z",
"published": "2026-03-25T12:30:21Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23281"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/03cc8f90d0537fcd4985c3319b4fafbf2e3fb1f0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/09f3c30ab3b1371eaf9676a1b8add57bca763083"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3c5c818c78b03a1725f3dcd566865c77b48dd3a6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3f9dec4a6d95d7f1f5e9e9dfdfa173c053bba8dc"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a9f55b14486426d907459bced5825a25063bd922"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b15e0fa7adb4de3a03aee9e6fc4d83e5cf0a65e4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d0155fe68f31b339961cf2d4f92937d57e9384e6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ed7d30f90b77f73a47498686ede83f622b7e4f0d"
}
],
"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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