CVE-2026-72073 (GCVE-0-2026-72073)
Vulnerability from cvelistv5
Published
2026-08-15 05:52
Modified
2026-08-17 05:07
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
mmc: vub300: fix use-after-free on probe failure
The vub300 driver lifetime-manages its controller state using
vub300->kref, with vub300_delete() freeing the mmc host when the last
reference is dropped. The probe error path after the inactivity timer has
been armed still bypasses that lifetime rule, however, and falls through
to mmc_free_host() directly if mmc_add_host() fails.
The race window is between arming the inactivity timer and reaching the
probe error unwind after mmc_add_host() fails:
probe thread timer/workqueue
------------ ---------------
kref_init(&vub300->kref) ref = 1
kref_get(&vub300->kref) ref = 2, timer ref
add_timer(inactivity_timer) fires after one second
|
| race window
|<---------------------------------------------------->
|
mmc_add_host(mmc)
inactivity timer fires
vub300_queue_dead_work()
kref_get() ref = 3
queue_work(deadwork)
mmc_add_host() fails
timer_delete_sync()
mmc_free_host(mmc)
frees vub300
deadwork runs
use-after-free
The inactivity timeout is one second, so this would require
mmc_add_host() to both fail and take more than one second to do so. This
is unlikely to happen in practice, but the error path is still wrong.
timer_delete_sync() only waits for the timer callback itself. It does
not flush deadwork that the callback may already have queued. As a
result, queued deadwork can still hold a kref while the probe error path
directly frees the backing mmc host, including the vub300 storage.
Fix this by using the same lifetime mechanism as disconnect. Clear
vub300->interface so that the timer callback and any queued deadwork
return early and drop their references, then drop the initial probe
reference and return without falling through to err_free_host.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 0613ad2401f88bdeae5594c30afe318e93b14676 Version: 0613ad2401f88bdeae5594c30afe318e93b14676 Version: 0613ad2401f88bdeae5594c30afe318e93b14676 Version: 41ed46bdbd2878cd6567abe0974a445f8b1b8ec8 Version: 25f05d762ca5e1c685002a53dd44f68e78ca3feb Version: a46e681151bbdacdf6b89ee8c4e5bad0555142bb Version: 3b29f8769d32016b2d89183db4d80c7a71b7e35e Version: 3049a3b927a40d89d4582ff1033cd7953be773c7 Version: afc898019e7bf18c5eb7a0ac19852fcb1b341b3c Version: c9e85979b59cb86f0a15defa8199d740e2b36b90 Version: 2044b2ea77945f372ef161d1bbf814e471767ff2 Version: 4.9.337 ≤ Version: 4.14.303 ≤ Version: 4.19.270 ≤ Version: 5.4.229 ≤ Version: 5.10.163 ≤ Version: 5.15.86 ≤ Version: 6.0.16 ≤ Version: 6.1.2 ≤ |
||
{
"containers": {
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"programFiles": [
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]
},
{
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"programFiles": [
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],
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"vendor": "Linux",
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}
]
}
],
"cpeApplicability": [
{
"nodes": [
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],
"negate": false,
"operator": "OR"
}
]
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmmc: vub300: fix use-after-free on probe failure\n\nThe vub300 driver lifetime-manages its controller state using\nvub300-\u003ekref, with vub300_delete() freeing the mmc host when the last\nreference is dropped. The probe error path after the inactivity timer has\nbeen armed still bypasses that lifetime rule, however, and falls through\nto mmc_free_host() directly if mmc_add_host() fails.\n\nThe race window is between arming the inactivity timer and reaching the\nprobe error unwind after mmc_add_host() fails:\n\n probe thread timer/workqueue\n ------------ ---------------\n kref_init(\u0026vub300-\u003ekref) ref = 1\n kref_get(\u0026vub300-\u003ekref) ref = 2, timer ref\n add_timer(inactivity_timer) fires after one second\n |\n | race window\n |\u003c----------------------------------------------------\u003e\n |\n mmc_add_host(mmc)\n inactivity timer fires\n vub300_queue_dead_work()\n kref_get() ref = 3\n queue_work(deadwork)\n mmc_add_host() fails\n timer_delete_sync()\n mmc_free_host(mmc)\n frees vub300\n deadwork runs\n use-after-free\n\nThe inactivity timeout is one second, so this would require\nmmc_add_host() to both fail and take more than one second to do so. This\nis unlikely to happen in practice, but the error path is still wrong.\n\ntimer_delete_sync() only waits for the timer callback itself. It does\nnot flush deadwork that the callback may already have queued. As a\nresult, queued deadwork can still hold a kref while the probe error path\ndirectly frees the backing mmc host, including the vub300 storage.\n\nFix this by using the same lifetime mechanism as disconnect. Clear\nvub300-\u003einterface so that the timer callback and any queued deadwork\nreturn early and drop their references, then drop the initial probe\nreference and return without falling through to err_free_host."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:07:41.431Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/5b82af744e06cd741938c3da54fdbe564a7e52d9"
},
{
"url": "https://git.kernel.org/stable/c/618cf6b139503ec18ef93ffd663396aaf99b763a"
},
{
"url": "https://git.kernel.org/stable/c/a3b5f242997a3be7404112fd48784881560aea57"
}
],
"title": "mmc: vub300: fix use-after-free on probe failure",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-72073",
"datePublished": "2026-08-15T05:52:24.676Z",
"dateReserved": "2026-08-09T03:40:39.904Z",
"dateUpdated": "2026-08-17T05:07:41.431Z",
"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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