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CVE-2023-0266 (GCVE-0-2023-0266)

Vulnerability from cvelistv5 – Published: 2023-01-30 13:09 – Updated: 2025-10-21 23:15
VLAI CISA Previdian
Title
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)
CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:C/C:L/I:H/A:H
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-01-29 15:07 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Kernel Affected: 4.14 , < 56b88b50565cd8b946a2d00b0c83927b7ebb055e (git)
guessed Create a notification for this product.
Date Public
2023-01-13 00:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: a17d340e-6173-450b-984f-3ae924ef01c0

Vulnerability ID: CVE-2023-0266

Status: Confirmed

Status Updated: 2023-03-30 00:00 UTC

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

Vulnerability ID: CVE-2023-0266

Status: Confirmed

Status Updated: 2023-03-30 00:00 UTC

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
Show details on NVD website
To clipboard 

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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.


Detection rules are retrieved from Rulezet.


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.