Security readout for executives and security teams
Plain-English summary
This vulnerability lets a local, low-privileged user ask the root-owned udisks service to overwrite LUKS encryption header metadata. That can make encrypted volumes unrecoverable, causing a serious denial of service and possible permanent data loss. It is not described as remotely exploitable in the supplied sources.
Executive priority
Treat this as high priority for RHEL 10 systems because the impact can be permanent loss of access to encrypted data. It is lower urgency than a remote code execution issue, but shared hosts and critical encrypted systems should be patched promptly.
Technical view
CVE-2026-26103 is a missing authorization check in udisks around a privileged D-Bus API for restoring LUKS headers. The CVSS vector is local, low complexity, low privileges, no user interaction, with high integrity and availability impact and no confidentiality impact.
Likely exposure
Exposure is local. The supplied affected list names Red Hat Enterprise Linux 10 and RHEL 10.0 Extended Update Support udisks2 packages. RHEL 6, 7, 8, and 9 are listed as unaffected. Shared Linux systems with local users and encrypted block devices have the clearest business risk.
Exploitation context
The source bundle does not cite active exploitation, and KEV status is false. Exploitation requires local access with low privileges. The main impact is destructive availability loss: corrupting encryption metadata so volumes become inaccessible.
Researcher notes
The key issue is CWE-862: a privileged D-Bus method lacks proper authorization before restoring LUKS headers. Available evidence supports local denial of service through integrity and availability damage, not data theft. Public source detail is limited; avoid assuming broader distribution impact beyond cited vendor data.
Mitigation direction
- Apply Red Hat fixes from RHSA-2026:3476 or RHSA-2026:5831 where applicable.
- Prioritize RHEL 10 and RHEL 10.0 EUS systems running affected udisks2 builds.
- Limit local shell access on systems with encrypted block devices.
- Review vendor guidance before applying nonstandard workarounds.
- Ensure recoverable backups exist for encrypted volumes before maintenance windows.
Validation and detection
- Inventory RHEL versions and installed udisks2 package builds.
- Compare affected hosts against Red Hat CVE and errata status.
- Confirm RHEL 6, 7, 8, and 9 systems are not in scope per vendor data.
- Check whether exposed systems allow untrusted local user accounts.
- Verify updated packages are deployed after patching.
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.