Linux Kernel Use-After-Free Vulnerability

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

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• cpe debian/debian linux10.0
• cpe linux/linux kernelversion unspecified
• vendor Linux Kernelversion unspecified

How to fix CVE-2023-0266

• Recommended remediation

  Apply updates per vendor instructions. CISA due date Apr 20, 2023.

• Official advisories

  • Arch Linux Security · security.archlinux.org
  • CISA KEV · cisa.gov
  • CVE.org · cve.org
  • FIRST EPSS · first.org
  • NIST NVD · nvd.nist.gov
  • VulnCheck KEV · vulncheck.com

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Technology hubs

Code

The project this record applies to. Exploit listings stay in References.

• Repository · git.kernel.org
• Repository · github.com

Timeline

Detection, updates, and resolution for this record.

1. Jan 30, 2023 · Catalog

   Detected

   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

2. Mar 30, 2023 · CISA KEV

   Known exploited

   Apply updates per vendor instructions.

3. Apr 20, 2023 · CISA KEV

   Remediation due

   Apply updates per vendor instructions.

4. Jun 16, 2026 · Catalog

   Updated

   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

Sources

• Arch Linux SecurityVendor advisoryCVE-2023-0266

  CVE-2023-0266 is named on the public Arch Linux Security page.

  security.archlinux.org
• CISA KEVConfirmed exploitationCVE-2023-0266

  Linux kernel contains a use-after-free vulnerability that allows for privilege escalation to gain ring0 access from the system user.

  cisa.gov
• CVE.orgVulnerability recordCVE-2023-0266

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2023-0266

  30-day exploitation probability 3.7%

  first.org
• NIST NVDVulnerability recordCVE-2023-0266

  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 upgradin

  nvd.nist.gov
• VulnCheck KEVConfirmed exploitationCVE-2023-0266

  Linux kernel contains a use-after-free vulnerability that allows for privilege escalation to gain ring0 access from the system user.

  vulncheck.com

References

• VulnCheck exploitation evidence · blog.google
• VulnCheck exploitation evidence · docs.google.com
• CISA note · git.kernel.org
• Patch · github.com
• Patch · github.com
• VulnCheck exploitation evidence · googleprojectzero.blogspot.com
• Mailing List · lists.debian.org
• CISA note · nvd.nist.gov
• VulnCheck exploitation evidence · storage.googleapis.com
• VulnCheck exploitation evidence · ti.qianxin.com
• VulnCheck exploitation evidence · cisa.gov

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.