CVE-2022-39842

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    CVE-2022-39842

    Published: 5 Sept 2022Last Modified: 12 Aug 2026

    Summary:

    Details: An issue was discovered in the Linux kernel before 5.19. In pxa3xx_gcu_write in drivers/video/fbdev/pxa3xx-gcu.c, the count parameter has a type conflict of size_t versus int, causing an integer overflow and bypassing the size check. After that, because it is used as the third argument to copy_from_user(), a heap overflow may occur. NOTE: the original discoverer disputes that the overflow can actually happen.

    References: https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19, https://lore.kernel.org/all/YylaC1wHHyLw22D3%40kadam/T/, https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/39xxx/CVE-2022-39842.json, https://nvd.nist.gov/vuln/detail/CVE-2022-39842, https://www.debian.org/security/2022/dsa-5257, https://github.com/torvalds/linux/commit/a09d2d00af53b43c6f11e6ab3cb58443c2cac8a7, https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html, https://lists.debian.org/debian-lts-announce/2022/11/msg00001.html

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -3d7cb6b04c3f3115719235cc6866b10326de34cd

    Affected versions

    v5.19-rc1

    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-2022-39842 | CVE-DB