CVE-2026-64509 (GCVE-0-2026-64509)
Vulnerability from cvelistv5
Published
2026-07-25 08:52
Modified
2026-08-17 04:56
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
rust: block: fix GenDisk cleanup paths
GenDiskBuilder::build() still has fallible work after
__blk_mq_alloc_disk(), but its error path only recovers the
foreign queue data. That leaks the temporary gendisk and
request_queue until later teardown. If the caller moved the last
Arc<TagSet<T>> into build(), the leaked queue can retain blk-mq
state after the tag set is dropped.
Fix the pre-registration failure path by dropping the temporary
gendisk reference with put_disk() before recovering queue_data,
so disk_release() can tear down the owned queue.
Also pair GenDisk::drop() with put_disk() after del_gendisk().
Once a Rust GenDisk has been added with device_add_disk(),
del_gendisk() only unregisters it; the final gendisk reference
still has to be dropped to complete the release path.
References
| URL | Tags | |
|---|---|---|
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"rust/kernel/block/mq/gen_disk.rs"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "d1dcaa5229a63a6b6df7e0f673fe576cf3d6e8cb",
"status": "affected",
"version": "3253aba3408aa4eb2e4e09365eede3e63ef7536b",
"versionType": "git"
},
{
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"status": "affected",
"version": "3253aba3408aa4eb2e4e09365eede3e63ef7536b",
"versionType": "git"
},
{
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"status": "affected",
"version": "3253aba3408aa4eb2e4e09365eede3e63ef7536b",
"versionType": "git"
},
{
"lessThan": "2957771379fa335103a4b539db57bb2271e12142",
"status": "affected",
"version": "3253aba3408aa4eb2e4e09365eede3e63ef7536b",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"rust/kernel/block/mq/gen_disk.rs"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.11"
},
{
"lessThan": "6.11",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.39",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.97",
"versionStartIncluding": "6.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.39",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"vulnerable": true
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{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrust: block: fix GenDisk cleanup paths\n\nGenDiskBuilder::build() still has fallible work after\n__blk_mq_alloc_disk(), but its error path only recovers the\nforeign queue data. That leaks the temporary gendisk and\nrequest_queue until later teardown. If the caller moved the last\nArc\u003cTagSet\u003cT\u003e\u003e into build(), the leaked queue can retain blk-mq\nstate after the tag set is dropped.\n\nFix the pre-registration failure path by dropping the temporary\ngendisk reference with put_disk() before recovering queue_data,\nso disk_release() can tear down the owned queue.\n\nAlso pair GenDisk::drop() with put_disk() after del_gendisk().\nOnce a Rust GenDisk has been added with device_add_disk(),\ndel_gendisk() only unregisters it; the final gendisk reference\nstill has to be dropped to complete the release path."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T04:56:59.904Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/d1dcaa5229a63a6b6df7e0f673fe576cf3d6e8cb"
},
{
"url": "https://git.kernel.org/stable/c/e7636f26f77070a529c26d65afd217514ce85ce4"
},
{
"url": "https://git.kernel.org/stable/c/6822a2685b4da9a87efd1fce4b042678a31ff734"
},
{
"url": "https://git.kernel.org/stable/c/2957771379fa335103a4b539db57bb2271e12142"
}
],
"title": "rust: block: fix GenDisk cleanup paths",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-64509",
"datePublished": "2026-07-25T08:52:02.486Z",
"dateReserved": "2026-07-19T15:36:31.793Z",
"dateUpdated": "2026-08-17T04:56:59.904Z",
"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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