A flaw was found in the udisks storage management daemon that allows unprivileged users to back up LUKS encryption headers without authorization. The issue occurs because a privileged D-Bus method responsible for exporting encryption metadata does not perform a policy check. As a result, sensitive cryptographic metadata can be read and written to attacker-controlled locations. This weakens the confidentiality guarantees of encrypted storage volumes.

The Rocky Linux 10.1 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-2026_3476 advisory.

    * udisks: Missing Authorization Check Allows Unprivileged Users to Back Up LUKS Headers via udisks D-Bus     API (CVE-2026-26104)

    * udisks: Missing Authorization Check Allows Unprivileged Users to Restore LUKS Headers via udisks D-Bus     API (CVE-2026-26103)

Tenable has extracted the preceding description block directly from the CIQ security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:5831 advisory.

    The Udisks project provides a daemon, tools, and libraries to access and manipulate disks, storage     devices, and technologies.

    Security Fix(es):

    * udisks: Missing Authorization Check Allows Unprivileged Users to Back Up LUKS Headers via udisks D-Bus     API (CVE-2026-26104)

    * udisks: Missing Authorization Check Allows Unprivileged Users to Restore LUKS Headers via udisks D-Bus     API (CVE-2026-26103)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-b8847e1e2c advisory.

    Rebase to latest upstream release

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote RockyLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2026:3476 advisory.

    * udisks: Missing Authorization Check Allows Unprivileged Users to Back Up LUKS Headers via udisks D-Bus     API (CVE-2026-26104)

    * udisks: Missing Authorization Check Allows Unprivileged Users to Restore LUKS Headers via udisks D-Bus     API (CVE-2026-26103)

Tenable has extracted the preceding description block directly from the RockyLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote AlmaLinux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:3476 advisory.

    * udisks: Missing Authorization Check Allows Unprivileged Users to Back Up LUKS Headers via udisks D-Bus     API (CVE-2026-26104)
      * udisks: Missing Authorization Check Allows Unprivileged Users to Restore LUKS Headers via udisks D-Bus     API (CVE-2026-26103)

Tenable has extracted the preceding description block directly from the AlmaLinux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:3476 advisory.

    The Udisks project provides a daemon, tools, and libraries to access and manipulate disks, storage     devices, and technologies.

    Security Fix(es):

    * udisks: Missing Authorization Check Allows Unprivileged Users to Back Up LUKS Headers via udisks D-Bus     API (CVE-2026-26104)

    * udisks: Missing Authorization Check Allows Unprivileged Users to Restore LUKS Headers via udisks D-Bus     API (CVE-2026-26103)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-3476 advisory.

    - Add missing polkit check for RestoreEncryptedHeader() (CVE-2026-26103) (RHEL-148565)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-c6d7c9de1d advisory.

    Rebase to latest upstream release

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
358059	Rocky Linux 10.1 [CIQ] Security Update: libudisks2 / libudisks2-debuginfo / libudisks2-devel / udisks2 / etc Multiple Vulnerabilities (crlsa-2026_3476)	Nessus	Rocky Linux Local Security Checks	Local	high
303757	RHEL 10 : udisks2 (RHSA-2026:5831)	Nessus	Red Hat Local Security Checks	Local	high
302044	Fedora 44 : udisks2 (2026-b8847e1e2c)	Nessus	Fedora Local Security Checks	Local	high
301124	RockyLinux 10 : udisks2 (RLSA-2026:3476)	Nessus	Rocky Linux Local Security Checks	Local	high
301098	AlmaLinux 10 : udisks2 (ALSA-2026:3476)	Nessus	Alma Linux Local Security Checks	Local	high
301028	RHEL 10 : udisks2 (RHSA-2026:3476)	Nessus	Red Hat Local Security Checks	Local	high
300901	Oracle Linux 10 : udisks2 (ELSA-2026-3476)	Nessus	Oracle Linux Local Security Checks	Local	high
300498	Fedora 43 : udisks2 (2026-c6d7c9de1d)	Nessus	Fedora Local Security Checks	Local	high

Detections

Analytics

CVE-2026-26104

medium

Tenable Plugins

high

high

high

high

high

high

high

high