CVE-2023-52926 (GCVE-0-2023-52926)
Vulnerability from cvelistv5 – Published: 2025-02-24 09:01 – Updated: 2026-08-05 09:12
VLAI
EPSS
VEX
Title
io_uring/rw: split io_read() into a helper
Summary
In the Linux kernel, the following vulnerability has been resolved:
IORING_OP_READ did not correctly consume the provided buffer list when
read i/o returned < 0 (except for -EAGAIN and -EIOCBQUEUED return).
This can lead to a potential use-after-free when the completion via
io_rw_done runs at separate context.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-25 16:27 UTC
CWE
- CWE-416 - Use After Free
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
2b188cc1bb857a9d4701ae59aa7768b5124e262e , < 72060434a14caea20925e492310d6e680e3f9007
(git)
Affected: 2b188cc1bb857a9d4701ae59aa7768b5124e262e , < 6c27fc6a783c8a77c756dd5461b15e465020d075 (git) Affected: 2b188cc1bb857a9d4701ae59aa7768b5124e262e , < a08d195b586a217d76b42062f88f375a3eedda4d (git) |
guessed | |
| Linux | Linux |
Affected:
5.1
Unaffected: 0 , < 5.1 (semver) Unaffected: 6.1.122 , ≤ 6.1.* (semver) Unaffected: 6.6.68 , ≤ 6.6.* (semver) Unaffected: 6.7 , ≤ * (original_commit_for_fix) |
guessed |
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"value": "AV:L - The bug is in io_uring IORING_OP_READ handling, reachable only via local syscalls (io_uring_setup/io_uring_enter), not via network packet processing.\nAC:L - An unprivileged attacker can reliably trigger the bad path by registering provided buffers and submitting IORING_OP_READ that fails with an error other than -EAGAIN/-EIOCBQUEUED; any race with async io_rw_done task-work is attacker-controlled.\nPR:L - io_uring is usable by unprivileged users by default (sysctl kernel.io_uring_disabled=0); no CAP_SYS_ADMIN or init-namespace root is required.\nUI:N - The attacker submits their own io_uring SQEs and provided buffers; no victim action is required.\nS:U - This is kernel memory corruption within the host kernel\u0027s authority (local privilege escalation), not a VM escape or IOMMU/security-boundary crossover.\nC:H - CVE documents a use-after-free on provided buffer list mishandling; UAF enables control of freed object contents and arbitrary kernel memory disclosure.\nI:H - Kernel UAF on provided buffers is exploitable for heap reuse and arbitrary write/control-flow hijacking, enabling privilege escalation.\nA:H - Use-after-free in io_uring completion can cause kernel oops/panic even when not fully exploited for code execution."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T09:12:04.609Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/72060434a14caea20925e492310d6e680e3f9007"
},
{
"url": "https://git.kernel.org/stable/c/6c27fc6a783c8a77c756dd5461b15e465020d075"
},
{
"url": "https://git.kernel.org/stable/c/a08d195b586a217d76b42062f88f375a3eedda4d"
}
],
"title": "io_uring/rw: split io_read() into a helper",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2023-52926",
"datePublished": "2025-02-24T09:01:19.209Z",
"dateReserved": "2024-08-21T06:07:11.018Z",
"dateUpdated": "2026-08-05T09:12:04.609Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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