CVE-2025-68294 (GCVE-0-2025-68294)
Vulnerability from cvelistv5 – Published: 2025-12-16 15:06 – Updated: 2026-08-05 12:10
VLAI
EPSS
VEX
Title
io_uring/net: ensure vectored buffer node import is tied to notification
Summary
In the Linux kernel, the following vulnerability has been resolved:
io_uring/net: ensure vectored buffer node import is tied to notification
When support for vectored registered buffers was added, the import
itself is using 'req' rather than the notification io_kiocb, sr->notif.
For non-vectored imports, sr->notif is correctly used. This is important
as the lifetime of the two may be different. Use the correct io_kiocb
for the vectored buffer import.
Severity
7.8 (High)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
23371eac7d9a9bca5360cfb3eb3aa08648ee7246 , < 14459281e027f23b70885c1cc1032a71c0efd8d7
(git)
Affected: 23371eac7d9a9bca5360cfb3eb3aa08648ee7246 , < f6041803a831266a2a5a5b5af66f7de0845bcbf3 (git) |
|
| Linux | Linux |
Affected:
6.15
Unaffected: 0 , < 6.15 (semver) Unaffected: 6.17.11 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix) |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"io_uring/net.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
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"versionType": "git"
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"version": "23371eac7d9a9bca5360cfb3eb3aa08648ee7246",
"versionType": "git"
}
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},
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"product": "Linux",
"programFiles": [
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"vendor": "Linux",
"versions": [
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"status": "affected",
"version": "6.15"
},
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"status": "unaffected",
"version": "0",
"versionType": "semver"
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"status": "unaffected",
"version": "6.17.11",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.18",
"versionType": "original_commit_for_fix"
}
]
}
],
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"vulnerable": true
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}
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"negate": false,
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"descriptions": [
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/net: ensure vectored buffer node import is tied to notification\n\nWhen support for vectored registered buffers was added, the import\nitself is using \u0027req\u0027 rather than the notification io_kiocb, sr-\u003enotif.\nFor non-vectored imports, sr-\u003enotif is correctly used. This is important\nas the lifetime of the two may be different. Use the correct io_kiocb\nfor the vectored buffer import."
}
],
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"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - Exploitation requires a local process to submit an IORING_OP_SENDMSG_ZC operation through io_uring; incoming network traffic alone cannot reach the vulnerable import path.\nAC:L - The attacker controls buffer registration, the vectored send, notification lifetime, and buffer unregistration or replacement. A corked, congested, or deliberately stalled socket can reliably keep the notification outstanding after the main request completes.\nPR:L - An ordinary unprivileged user can create an io_uring instance, register their own memory, and use TCP or UDP sockets without capabilities when io_uring is enabled under its default policy.\nUI:N - No action by another user is required after the attacker submits the operations and manipulates the registered-buffer lifetime.\nS:U - Any resulting kernel compromise is a conventional local privilege escalation within the host kernel\u0027s security authority, not a mandatory cross-scope escape.\nC:H - The premature unpin permits network transmission to continue reading pages after they have been freed or recycled, potentially disclosing arbitrary kernel or other-process memory to an attacker-controlled peer.\nI:H - The stale managed fragments can cause page-reference and allocator corruption when subsequently referenced or downgraded, providing a use-after-free-class primitive that can plausibly be developed into arbitrary memory modification or kernel code execution.\nA:H - Accessing or changing references on prematurely released pages can trigger kernel faults, allocator corruption, oopses, or a system panic."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:10:41.250Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
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"url": "https://git.kernel.org/stable/c/14459281e027f23b70885c1cc1032a71c0efd8d7"
},
{
"url": "https://git.kernel.org/stable/c/f6041803a831266a2a5a5b5af66f7de0845bcbf3"
}
],
"title": "io_uring/net: ensure vectored buffer node import is tied to notification",
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"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2025-68294",
"datePublished": "2025-12-16T15:06:14.177Z",
"dateReserved": "2025-12-16T14:48:05.293Z",
"dateUpdated": "2026-08-05T12:10:41.250Z",
"state": "PUBLISHED"
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"dataVersion": "5.2",
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"epss": {
"cve": "CVE-2025-68294",
"date": "2026-10-12",
"epss": "0.00143",
"percentile": "0.03127"
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"nvd": {
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"affected": [
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"product": "Linux",
"programFiles": [
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"status": "affected",
"version": "23371eac7d9a9bca5360cfb3eb3aa08648ee7246",
"versionType": "git"
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"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.15"
},
{
"lessThan": "6.15",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.17.*",
"status": "unaffected",
"version": "6.17.11",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.18",
"versionType": "original_commit_for_fix"
}
]
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],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/net: ensure vectored buffer node import is tied to notification\n\nWhen support for vectored registered buffers was added, the import\nitself is using \u0027req\u0027 rather than the notification io_kiocb, sr-\u003enotif.\nFor non-vectored imports, sr-\u003enotif is correctly used. This is important\nas the lifetime of the two may be different. Use the correct io_kiocb\nfor the vectored buffer import."
}
],
"id": "CVE-2025-68294",
"lastModified": "2026-07-30T06:24:36.820",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
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"published": "2025-12-16T16:16:08.303",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/14459281e027f23b70885c1cc1032a71c0efd8d7"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/f6041803a831266a2a5a5b5af66f7de0845bcbf3"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Deferred"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-07-30T08:34:05+00:00",
"cve": "CVE-2025-68294",
"id": "CVE-2025-68294",
"initial_release_date": "2025-12-16T00:00:00+00:00",
"product_status:known_affected": "76",
"product_status:known_not_affected": "198",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: Linux kernel: Denial of Service in io_uring/net due to incorrect buffer handling",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68294.json",
"version": "3"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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