CVE-2026-74313 (GCVE-0-2026-74313)
Vulnerability from cvelistv5
Published
2026-08-15 05:58
Modified
2026-08-17 05:45
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
vduse: hold vduse_lock across IDR lookup in open path
vduse_dev_open() looks up struct vduse_dev through the IDR and then
acquires dev->lock only after vduse_lock has been dropped.
This leaves a window where a concurrent VDUSE_DESTROY_DEV can remove the
same object from the IDR and free it before the open path locks the
device, leading to a use-after-free.
Close this race by keeping vduse_lock held until dev->lock has been
acquired in the open path, matching the lock ordering already used by
the destroy path.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: c8a6153b6c59d95c0e091f053f6f180952ade91e Version: c8a6153b6c59d95c0e091f053f6f180952ade91e Version: c8a6153b6c59d95c0e091f053f6f180952ade91e Version: c8a6153b6c59d95c0e091f053f6f180952ade91e Version: c8a6153b6c59d95c0e091f053f6f180952ade91e Version: c8a6153b6c59d95c0e091f053f6f180952ade91e Version: c8a6153b6c59d95c0e091f053f6f180952ade91e |
||
{
"containers": {
"cna": {
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{
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"product": "Linux",
"programFiles": [
"drivers/vdpa/vdpa_user/vduse_dev.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"versionType": "git"
},
{
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},
{
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"product": "Linux",
"programFiles": [
"drivers/vdpa/vdpa_user/vduse_dev.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"version": "5.15"
},
{
"lessThan": "5.15",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.5",
"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": "5.15.212",
"versionStartIncluding": "5.15",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
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},
{
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},
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{
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},
{
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"versionStartIncluding": "5.15",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvduse: hold vduse_lock across IDR lookup in open path\n\nvduse_dev_open() looks up struct vduse_dev through the IDR and then\nacquires dev-\u003elock only after vduse_lock has been dropped.\n\nThis leaves a window where a concurrent VDUSE_DESTROY_DEV can remove the\nsame object from the IDR and free it before the open path locks the\ndevice, leading to a use-after-free.\n\nClose this race by keeping vduse_lock held until dev-\u003elock has been\nacquired in the open path, matching the lock ordering already used by\nthe destroy path."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The vulnerability is only reachable via local syscalls on VDUSE character devices: open(2) on /dev/vduse/$NAME racing with ioctl(VDUSE_DESTROY_DEV) on /dev/vduse/control. It is not triggered by remote network traffic, adjacent wireless protocols, or physical device attachment.\nAC:L - The attacker fully controls both sides of the race by creating a VDUSE device, then concurrently calling open() and VDUSE_DESTROY_DEV from their own threads. No timing or layout conditions outside attacker control are required beyond standard thread scheduling.\nPR:L - Neither the open nor destroy paths enforce capabilities beyond device-node access; only VIRTIO_ID_NET creation requires CAP_NET_ADMIN. VDUSE is designed so userspace dataplane operators with access to /dev/vduse nodes can create, open, and destroy block devices without full host admin rights.\nUI:N - Exploitation requires no victim interaction. The attacker creates their own VDUSE instance and triggers the open/destroy race from their process; no separate user must mount, configure, or open the device.\nS:C - On cloud and virtualization hosts where VDUSE is delegated to containers or NFV tenant workloads, kernel UAF exploitation crosses from the tenant/container security boundary to full host kernel compromise, comparable to a VM or sandbox escape.\nC:H - The race produces a use-after-free of kmalloc\u0027d struct vduse_dev. Locking and dereferencing the freed object, plus subsequent ioctl/read/write using dangling file-\u003eprivate_data, enables slab reuse and arbitrary kernel memory disclosure.\nI:H - UAF of vduse_dev allows heap grooming over mutexes, virtqueue pointers, and config buffers. Follow-on VDUSE ioctls (SET_CONFIG, VQ_SETUP, IOTLB) on the dangling fd provide exploitable arbitrary-write and control-flow hijack primitives.\nA:H - Use-after-free during mutex_lock on the freed device or later VDUSE operations can immediately corrupt kernel memory and trigger oops/panic, fully denying system availability even before full exploitation."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:45:46.036Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/35483c5306e09b3190ff937089d404a78012695c"
},
{
"url": "https://git.kernel.org/stable/c/5c1560be8aa6849356455af67518d35c551cbd95"
},
{
"url": "https://git.kernel.org/stable/c/93ed4692f2299a40346025979f40e4a9b7b33af7"
},
{
"url": "https://git.kernel.org/stable/c/d94e2947203aead590fd63f667d316d4475d65af"
},
{
"url": "https://git.kernel.org/stable/c/a2d0a57538fd0b3b3ab75d64bb64f4cd2fab13a2"
},
{
"url": "https://git.kernel.org/stable/c/79e12c891940b0c4c75881b7fd82a8cbb8ac97be"
},
{
"url": "https://git.kernel.org/stable/c/e440e077748939839d9f76e24383b76b785f80ce"
}
],
"title": "vduse: hold vduse_lock across IDR lookup in open path",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74313",
"datePublished": "2026-08-15T05:58:12.058Z",
"dateReserved": "2026-08-15T05:44:03.883Z",
"dateUpdated": "2026-08-17T05:45:46.036Z",
"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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