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    CVE-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 upgrading past commit 56b88b50565cd8b946a2d00b0c83927b7ebb055e

    Published:Jan 13, 2023
    Last Modified:Oct 24, 2025
    EPS:Jan 30, 2023
    EPSS Score:0.00034
    CVSS Score:7.9

    CISA Notification

    Description

    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

    Required Action:

    Apply updates per vendor instructions.

    Notes:

    No extra notes provided.

    Due Date
    Apr 20, 2023
    1240 days ago
    Alert Date
    Mar 30, 2023
    1261 days ago

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Linux
    Product
    Linux Kernel
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel Aus
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Tus
    Vendor
    Redhat
    Product
    Rhev Hypervisor

    Exploits

    https://github.com/SeanHeelan/claude_opus_cve_2023_0266

    Common Weakness Enumeration

    CWE-416 Use After Free

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    References

    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://github.com/torvalds/linux/commit/56b88b50565cd8b946a2d00b0c83927b7ebb055e
    https://github.com/torvalds/linux/commit/becf9e5d553c2389d857a3c178ce80fdb34a02e1
    https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html
    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://github.com/torvalds/linux/commit/56b88b50565cd8b946a2d00b0c83927b7ebb055e
    https://github.com/torvalds/linux/commit/becf9e5d553c2389d857a3c178ce80fdb34a02e1
    https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html
    https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-0266

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High