CVE-2026-80659 (GCVE-0-2026-80659)
Vulnerability from cvelistv5
Published
2026-08-28 06:49
Modified
2026-08-28 06:49
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
mmc: vub300: defer reset until cmd_mutex is unlocked
vub300_cmndwork_thread() holds cmd_mutex while it sends a command and
waits for the command response. If the response wait times out,
__vub300_command_response() kills the command URBs and then synchronously
resets the USB device through usb_reset_device().
That reset path re-enters the driver through vub300_pre_reset(), which
also takes cmd_mutex. The worker therefore tries to acquire the same
mutex recursively while it is still holding it from the command path.
This issue was found by our static analysis tool and then manually
reviewed against the current tree.
The grounded PoC kept the real worker and timeout/reset carrier:
vub300_cmndwork_thread()
__vub300_command_response()
usb_lock_device_for_reset()
usb_reset_device()
vub300_pre_reset()
Lockdep reported the same-task recursive acquisition on cmd_mutex:
WARNING: possible recursive locking detected
... (&test_vub300.cmd_mutex) ... at: usb_reset_device... [vuln_msv]
... (&test_vub300.cmd_mutex) ... at: vub300_cmndwork_thread+0x12/0x20 [vuln_msv]
Workqueue: vub300_cmd_wq vub300_cmndwork_thread [vuln_msv]
*** DEADLOCK ***
Return a flag from __vub300_command_response() when the timeout path needs
a device reset, then perform the reset after vub300_cmndwork_thread() has
cleared the in-flight command state and dropped cmd_mutex. The reset is
still attempted before mmc_request_done(), preserving the existing request
completion ordering while avoiding the recursive lock.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 88095e7b473a3d9ec3b9c60429576e9cbd327c89 Version: 88095e7b473a3d9ec3b9c60429576e9cbd327c89 Version: 88095e7b473a3d9ec3b9c60429576e9cbd327c89 Version: 88095e7b473a3d9ec3b9c60429576e9cbd327c89 Version: 88095e7b473a3d9ec3b9c60429576e9cbd327c89 Version: 88095e7b473a3d9ec3b9c60429576e9cbd327c89 Version: 88095e7b473a3d9ec3b9c60429576e9cbd327c89 Version: 88095e7b473a3d9ec3b9c60429576e9cbd327c89 |
||
{
"containers": {
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"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/mmc/host/vub300.c"
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"version": "3.0"
},
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"version": "0",
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},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.261",
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},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.212",
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},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
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{
"lessThanOrEqual": "6.6.*",
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{
"lessThanOrEqual": "*",
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"versionType": "original_commit_for_fix"
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}
],
"cpeApplicability": [
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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\nmmc: vub300: defer reset until cmd_mutex is unlocked\n\nvub300_cmndwork_thread() holds cmd_mutex while it sends a command and\nwaits for the command response. If the response wait times out,\n__vub300_command_response() kills the command URBs and then synchronously\nresets the USB device through usb_reset_device().\n\nThat reset path re-enters the driver through vub300_pre_reset(), which\nalso takes cmd_mutex. The worker therefore tries to acquire the same\nmutex recursively while it is still holding it from the command path.\n\nThis issue was found by our static analysis tool and then manually\nreviewed against the current tree.\n\nThe grounded PoC kept the real worker and timeout/reset carrier:\n\n vub300_cmndwork_thread()\n __vub300_command_response()\n usb_lock_device_for_reset()\n usb_reset_device()\n vub300_pre_reset()\n\nLockdep reported the same-task recursive acquisition on cmd_mutex:\n\n WARNING: possible recursive locking detected\n ... (\u0026test_vub300.cmd_mutex) ... at: usb_reset_device... [vuln_msv]\n ... (\u0026test_vub300.cmd_mutex) ... at: vub300_cmndwork_thread+0x12/0x20 [vuln_msv]\n Workqueue: vub300_cmd_wq vub300_cmndwork_thread [vuln_msv]\n *** DEADLOCK ***\n\nReturn a flag from __vub300_command_response() when the timeout path needs\na device reset, then perform the reset after vub300_cmndwork_thread() has\ncleared the in-flight command state and dropped cmd_mutex. The reset is\nstill attempted before mmc_request_done(), preserving the existing request\ncompletion ordering while avoiding the recursive lock."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-28T06:49:04.389Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/8672b8bdbd2063b3fcbd75f729e4706fcdad2257"
},
{
"url": "https://git.kernel.org/stable/c/8344611477c9241f45f20981990780fc5f0996f8"
},
{
"url": "https://git.kernel.org/stable/c/2e6b9a394206c76dd417c991312f349435ef35e6"
},
{
"url": "https://git.kernel.org/stable/c/7ee7a77ec2f446109ab52cc80ace7acc22ab6211"
},
{
"url": "https://git.kernel.org/stable/c/9f5e04235a0b59e6e30af9f45511addf2604d757"
},
{
"url": "https://git.kernel.org/stable/c/bf9848a22a8e50d39d5e8d871581f0a8110f16b3"
},
{
"url": "https://git.kernel.org/stable/c/c2e1d33929565fa14c48d8a5a45edc3ebfc941b2"
},
{
"url": "https://git.kernel.org/stable/c/ee5fb641c4ccac8406c668d3e947eb20ce44f233"
}
],
"title": "mmc: vub300: defer reset until cmd_mutex is unlocked",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-80659",
"datePublished": "2026-08-28T06:49:04.389Z",
"dateReserved": "2026-08-26T14:34:25.780Z",
"dateUpdated": "2026-08-28T06:49:04.389Z",
"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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