Security readout for executives and security teams
Plain-English summary
CVE-2026-26103 lets a local, low-privileged user abuse udisks to overwrite LUKS encryption header metadata. The business impact is not data theft; it is loss of access to encrypted volumes, potentially causing irreversible data loss and operational outage.
Executive priority
Treat as high priority for affected Linux fleets because the outcome can be business-disrupting data unavailability. It is local-only, so prioritize shared workstations, bastions, labs, and servers with broad user access.
Technical view
udisks exposes a privileged D-Bus API for restoring LUKS headers. The flaw is a missing authorization check, CWE-862, allowing a local authenticated user to trigger root-owned metadata overwrite on block devices. CVSS 3.1 is 7.1 with high integrity and availability impact.
Likely exposure
Exposure appears limited to local users on affected Red Hat Enterprise Linux 10 and 10.0 EUS systems running the listed udisks2 packages. The source bundle marks RHEL 6, 7, 8, and 9 as unaffected.
Exploitation context
The bundle does not show CISA KEV listing or cited evidence of active exploitation. Attackers need local low-privileged access, no user interaction, and can cause denial of service by invalidating encrypted volume access.
Researcher notes
Evidence supports a local authorization bypass in a privileged storage-management path. The impact is destructive availability and integrity loss, not confidentiality. The bundle does not provide exploit code, active exploitation evidence, or detailed fixed-version data beyond Red Hat advisories.
Mitigation direction
- Review Red Hat advisories RHSA-2026:3476 and RHSA-2026:5831 for applicable updates.
- Apply vendor-provided udisks2 updates for affected RHEL 10 streams.
- Prioritize systems using LUKS-encrypted block devices with local multi-user access.
- Limit unnecessary local shell or desktop access until vendor guidance is applied.
- Ensure encrypted volume recovery and backup procedures are current.
Validation and detection
- Inventory RHEL 10 and RHEL 10.0 EUS hosts with udisks2 installed.
- Compare installed udisks2 packages against the Red Hat advisory guidance.
- Confirm RHEL 6, 7, 8, and 9 are not tracked as affected for this CVE.
- Identify hosts with LUKS-encrypted volumes managed through udisks.
- Check patch compliance after applying relevant Red Hat errata.
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-2026-26103 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
- High
- CVSS
- 7.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
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.
SSVC decision data
CVSS vector scores
2 official scoresWe 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:N/I:H/A:H1.85.2redhatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H1.85.2redhat-SADPVulnerability scoring details
Base CVSS 3.1 score
7.1HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Base CVSS 3.1 score
7.1HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- ADP timelineredhat-SADP
Reported to Red Hat.
- Source timelineredhat
Reported to Red Hat.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- ADP timelineredhat-SADP
Made public.
- Source timelineredhat
Made public.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2026-01-28T07:52:03.200Z: Reported to Red Hat.
- 2026-02-25T06:00:00.000Z: Made public.
Source materials
- CVE List V5 sourceCVE List V5
- RHSA-2026:3476CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2026:5831CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-26103CVE reference, redhat · vdb-entry, x_refsource_REDHAT
- RHBZ#2433719CVE reference, redhat · issue-tracking, x_refsource_REDHAT
- https://github.com/storaged-project/udisks/security/advisories/GHSA-c75h-phf8-ccjmCVE reference, redhat
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26103.jsonCVE reference, redhat-SADP · x_sadp-csaf-vex
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.