CVE-2026-99232

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    CVE-2026-99232

    Published: 2 Nov 2026Last Modified: 5 Nov 2026

    Summary: tracing/syscalls: Use copy_from_user for the faultable syscall buffer

    Details: In the Linux kernel, the following vulnerability has been resolved: tracing/syscalls: Use copy_from_user for the faultable syscall buffer syscall_copy_user_array() copies the buffer argument of faultable syscalls (write, pwrite64, ...) with __copy_from_user(), which skips access_ok(). Use copy_from_user() instead so a non-user address is rejected and the entry is recorded as faulted. It could be a security concern for machines that trust perf a bit too much.

    References: https://git.kernel.org/stable/c/041d1a568a11a7ed7415ef1408d0c65041c1ad69, https://git.kernel.org/stable/c/097fd0050089df17b032f2b852b9b65e548e342a, https://git.kernel.org/stable/c/e33e2718c62a602001ab549642a1aed0be797105, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99232.json, https://nvd.nist.gov/vuln/detail/CVE-2026-99232, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- baa031b7bd2ce7502339174a42974321859ecd6a
    Fixed -e33e2718c62a602001ab549642a1aed0be797105

    Affected versions

    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
    CVE-2026-99232 | CVE-DB