Security readout for executives and security teams
Plain-English summary
CVE-2026-26104 lets a logged-in, unprivileged local user use udisks to export LUKS encryption header metadata without the expected authorization. This does not directly decrypt disks, but it exposes sensitive cryptographic material that can weaken encrypted-volume confidentiality if combined with other access or attacks.
Executive priority
Treat as a moderate confidentiality issue. It is not known to be remotely exploitable, but it affects encrypted-storage assurances on certain RHEL 10 systems. Patch through Red Hat guidance during the next security update window, faster for shared or high-sensitivity systems.
Technical view
udisks exposes a privileged D-Bus method for backing up LUKS headers. The method lacks a required policy authorization check, allowing low-privileged local users to read encryption metadata and write it to attacker-controlled locations. Red Hat maps this to CWE-862 with CVSS 3.1 score 5.5, local attack vector, low complexity, and high confidentiality impact.
Likely exposure
Exposure is primarily Linux systems running affected Red Hat Enterprise Linux 10 udisks2 packages listed by Red Hat. RHEL 6, 7, 8, and 9 are listed as unaffected in the provided data. The issue requires local low-privileged access, so shared workstations, multi-user servers, and compromised user accounts matter most.
Exploitation context
The provided sources do not indicate known active exploitation, and the CVE is not listed as KEV in the supplied bundle. Exploitation is local and does not require user interaction. The security impact is disclosure of LUKS header metadata, not immediate privilege escalation or direct disk decryption.
Researcher notes
Key uncertainty is fixed-version detail: the provided bundle names affected package builds and advisories but does not include full remediation text. Validate against Red Hat errata and the upstream GHSA before closing. Avoid assuming broader Linux distribution impact unless their maintainers publish affected status.
Mitigation direction
- Review Red Hat advisories RHSA-2026:3476 and RHSA-2026:5831 for applicable udisks2 updates.
- Prioritize updates on RHEL 10 systems using encrypted storage and local user access.
- Restrict unnecessary local shell access on affected systems until vendor guidance is applied.
- Check the upstream udisks GHSA advisory for project-level remediation details.
Validation and detection
- Inventory systems running RHEL 10 or RHEL 10.0 EUS.
- Identify installed udisks2 package versions and compare against Red Hat advisories.
- Confirm RHEL 6, 7, 8, and 9 are not treated as affected from this source set.
- Review local account exposure on encrypted-storage hosts.
- Document whether vendor updates from the referenced RHSAs are installed.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-862: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-26104 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N1.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- RHSA-2026:3476CVE reference · vendor-advisory, x_refsource_REDHAT
- RHSA-2026:5831CVE reference · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-26104CVE reference · vdb-entry, x_refsource_REDHAT
- RHBZ#2433717CVE reference · issue-tracking, x_refsource_REDHAT
- https://github.com/storaged-project/udisks/security/advisories/GHSA-fcvx-497g-6xmwCVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Missing Authorization
Missing Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.