mmc: vub300: fix use-after-free on probe failure
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 v
CVE-2026-72073
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-72073
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "0613ad2401f88bdeae5594c30afe318e93b14676",
"lessThan": "face65f80c6946c631ca3490b4ebd2c016a4fd2c",
"versionType": "git"
},
{
"status": "affected",
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"lessThan": "6c66653dac9b25272d5fd4ed42a34aa5249e16df",
"versionType": "git"
},
{
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"versionType": "git"
},
{
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"versionType": "git"
},
{
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"versionType": "git"
},
{
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{
"status": "affected",
"version": "25f05d762ca5e1c685002a53dd44f68e78ca3feb",
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{
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{
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{
"status": "affected",
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"versionType": "git"
},
{
"status": "affected",
"version": "afc898019e7bf18c5eb7a0ac19852fcb1b341b3c",
"versionType": "git"
},
{
"status": "affected",
"version": "c9e85979b59cb86f0a15defa8199d740e2b36b90",
"versionType": "git"
},
{
"status": "affected",
"version": "2044b2ea77945f372ef161d1bbf814e471767ff2",
"versionType": "git"
},
{
"status": "affected",
"version": "4.9.337",
"lessThan": "4.10",
"versionType": "semver"
},
{
"status": "affected",
"version": "4.14.303",
"lessThan": "4.15",
"versionType": "semver"
},
{
"status": "affected",
"version": "4.19.270",
"lessThan": "4.20",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.4.229",
"lessThan": "5.5",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.10.163",
"lessThan": "5.11",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.86",
"lessThan": "5.16",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.0.16",
"lessThan": "6.1",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.2",
"lessThan": "6.2",
"versionType": "semver"
}
],
"programFiles": [
"drivers/mmc/host/vub300.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.2",
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},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.42",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/mmc/host/vub300.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-72073
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46489 · Revision 1
- Added to Heist Feed
- Publisher date