CVE-2023-0266 (GCVE-0-2023-0266)
Vulnerability from cvelistv5 – Published: 2023-01-30 13:09 – Updated: 2025-10-21 23:15Title
Use after free in SNDRV_CTL_IOCTL_ELEM in Linux Kernel
Summary
A use after free vulnerability exists in the ALSA PCM package in the Linux Kernel. SNDRV_CTL_IOCTL_ELEM_{READ|WRITE}32 is missing locks that can be used in a use-after-free that can result in a priviledge escalation to gain ring0 access from the system user. We recommend upgrading past commit 56b88b50565cd8b946a2d00b0c83927b7ebb055e
Severity
7.9 (High)
SSVC
Exploitation: active
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-01-29 15:07 UTC
CWE
- CWE-416 - Use After Free
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux Kernel |
Affected:
4.14 , < 56b88b50565cd8b946a2d00b0c83927b7ebb055e
(git)
|
guessed |
Date Public
2023-01-13 00:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: a17d340e-6173-450b-984f-3ae924ef01c0
Exploited: Yes
Timestamps
First Seen: 2023-03-30
Asserted: 2023-03-30
Scope
Notes: KEV entry: Linux Kernel Use-After-Free Vulnerability | Affected: Linux / Kernel | Description: Linux kernel contains a use-after-free vulnerability that allows for privilege escalation to gain ring0 access from the system user. | Required action: Apply updates per vendor instructions. | Due date: 2023-04-20 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/queue-5.10/alsa-pcm-move-rwsem-lock-inside-snd_ctl_elem_read-to-prevent-uaf.patch?id=72783cf35e6c55bca84c4bb7b776c58152856fd4; https://nvd.nist.gov/vuln/detail/CVE-2023-0266
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-416 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Kernel |
| Due Date | 2023-04-20 |
| Date Added | 2023-03-30 |
| Vendorproject | Linux |
| Vulnerabilityname | Linux Kernel Use-After-Free Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-02-02 12:27 UTC
| Updated: 2026-02-06 07:17 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: c772770d-2948-4080-8fb4-bd6e7cf2055b
Exploited: Yes
Timestamps
First Seen: 2023-03-30
Asserted: 2023-03-30
Scope
Notes: KEVIntel entry: Use after free in SNDRV_CTL_IOCTL_ELEM in Linux Kernel | Affected: Linux / Linux Kernel | CVSS: 7.9 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | Use after free in SNDRV_CTL_IOCTL_ELEM in Linux Kernel |
| Vendor | Linux |
| Product | Linux Kernel |
| Added Date | 2023-03-30T00:00:00.000Z |
| Cvss Score | 7.9 |
| Epss Score | None |
| Cvss Severity | HIGH |
| Epss Percentile | None |
| Used In Malware | unknown |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-23 14:05 UTC
| Updated: 2026-07-10 06:14 UTC
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"value": "Existe una vulnerabilidad de Use-After-Free en el paquete ALSA PCM en el kernel de Linux. A SNDRV_CTL_IOCTL_ELEM_{READ|WRITE}32 le faltan bloqueos que se pueden usar en un Use-After-Free que puede resultar en una escalada de privilegios para obtener acceso al anillo 0 por parte del usuario del sistema. Recomendamos actualizar al commit anterior 56b88b50565cd8b946a2d00b0c83927b7ebb055e"
}
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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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