CVE-2026-23281 (GCVE-0-2026-23281)
Vulnerability from cvelistv5
Published
2026-03-25 10:26
Modified
2026-04-18 08:57
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In 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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 954ee164f4f4598afc172c0ec3865d0352e55a0b Version: 954ee164f4f4598afc172c0ec3865d0352e55a0b Version: 954ee164f4f4598afc172c0ec3865d0352e55a0b Version: 954ee164f4f4598afc172c0ec3865d0352e55a0b Version: 954ee164f4f4598afc172c0ec3865d0352e55a0b Version: 954ee164f4f4598afc172c0ec3865d0352e55a0b Version: 954ee164f4f4598afc172c0ec3865d0352e55a0b Version: 954ee164f4f4598afc172c0ec3865d0352e55a0b |
||
{
"containers": {
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"programFiles": [
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"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.24"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.10.253",
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},
{
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"status": "unaffected",
"version": "5.15.203",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.167",
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},
{
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"status": "unaffected",
"version": "6.6.130",
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},
{
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"status": "unaffected",
"version": "6.12.78",
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},
{
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"status": "unaffected",
"version": "6.18.17",
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},
{
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"status": "unaffected",
"version": "6.19.7",
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{
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"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
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"negate": false,
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],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"providerMetadata": {
"dateUpdated": "2026-04-18T08:57:36.792Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/b15e0fa7adb4de3a03aee9e6fc4d83e5cf0a65e4"
},
{
"url": "https://git.kernel.org/stable/c/09f3c30ab3b1371eaf9676a1b8add57bca763083"
},
{
"url": "https://git.kernel.org/stable/c/3f9dec4a6d95d7f1f5e9e9dfdfa173c053bba8dc"
},
{
"url": "https://git.kernel.org/stable/c/3c5c818c78b03a1725f3dcd566865c77b48dd3a6"
},
{
"url": "https://git.kernel.org/stable/c/d0155fe68f31b339961cf2d4f92937d57e9384e6"
},
{
"url": "https://git.kernel.org/stable/c/ed7d30f90b77f73a47498686ede83f622b7e4f0d"
},
{
"url": "https://git.kernel.org/stable/c/a9f55b14486426d907459bced5825a25063bd922"
},
{
"url": "https://git.kernel.org/stable/c/03cc8f90d0537fcd4985c3319b4fafbf2e3fb1f0"
}
],
"title": "wifi: libertas: fix use-after-free in lbs_free_adapter()",
"x_generator": {
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}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-23281",
"datePublished": "2026-03-25T10:26:41.844Z",
"dateReserved": "2026-01-13T15:37:45.992Z",
"dateUpdated": "2026-04-18T08:57:36.792Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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