UBUNTU-CVE-2026-91786

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    UBUNTU-CVE-2026-91786

    Published: 15 Sept 2026Last Modified: 3 Nov 2026
    Upstream:
    CVE-2026-91786
    Aliases:
    USN-8971-1

    Summary:

    Details: A flaw was found in GNOME Shell. When processing icons from a remote search provider via D-Bus, the system fails to validate the icon's declared dimensions against the actual data buffer size. A malicious or compromised remote search provider could exploit this by providing oversized icon dimensions, leading to an out-of-bounds read. This can cause the GNOME Shell process to crash, disrupting the user's session, and potentially disclose sensitive information from adjacent memory.

    References: https://ubuntu.com/security/CVE-2026-91786, https://www.cve.org/CVERecord?id=CVE-2026-91786, https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/4418, https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/4417, https://ubuntu.com/security/notices/USN-8971-1

    Affected packages

    Package

    Name: gnome-shell

    Purl: pkg:deb/ubuntu/gnome-shell?arch=source&distro=esm-apps%2Fxenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    3.16.4-0ubuntu1

    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