Udisks: missing authorization check allows unprivileged users to restore luks headers via udisks d-bus api
Priority LOW 30CWE-862Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-862.
Summary
A flaw was found in the udisks storage management daemon that exposes a privileged D-Bus API for restoring LUKS encryption headers without proper authorization checks. The issue allows a local unprivileged user to instruct the root-owned udisks daemon to overwrite encryption metadata on block devices. This can permanently invalidate encryption keys and render encrypted volumes inaccessible. Successful exploitation results in a denial-of-service condition through irreversible data loss.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00082 0th percentileScored 2026-11-07
Fix Fixed Red Hat: 2 advisories
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | 2.10.90-6.el10_1.1 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — | 2.10.90-5.el10_0.2 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 6 | — | — | Not affected | CNA |
| Red Hat | Red Hat Enterprise Linux 7 | — | — | Not affected | CNA |
| Red Hat | Red Hat Enterprise Linux 8 | — | — | Not affected | CNA |
| Red Hat | Red Hat Enterprise Linux 9 | — | — | Not affected | CNA |
- Red Hat Enterprise Linux 10 VendorRed Hat Affected — Fixed in 2.10.90-6.el10_1.1 Patch available CNA
- Red Hat Enterprise Linux 10.0 Extended Update Support VendorRed Hat Affected — Fixed in 2.10.90-5.el10_0.2 Patch available CNA
- Red Hat Enterprise Linux 6 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in — Not affected CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Red Hat |
| cpe:2.3:a:freedesktop:udisks:2.0.0:*:*:*:*:*:*:* | 2.0.0 | Vulnerable | Freedesktop |
- cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Red Hat
- cpe:2.3:a:freedesktop:udisks:2.0.0:*:*:*:*:*:*:* Versions 2.0.0 Vulnerable ·Freedesktop
Remediation
Red Hat 2 advisories
- RHSA-2026:5831 Released 2026-03-25 · Red Hat rating Importantudisks2 security update
- Red Hat Enterprise Linux AppStream EUS (v. 10.0) libudisks2-2.10.90-5.el10_0.2, udisks2-2.10.90-5.el10_0.2, udisks2-iscsi-2.10.90-5.el10_0.2 +2
- Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libudisks2-devel-2.10.90-5.el10_0.2
- RHSA-2026:3476 Released 2026-03-02 · Red Hat rating Importantudisks2 security update
- Red Hat Enterprise Linux AppStream (v. 10) libudisks2-2.10.90-6.el10_1.1, udisks2-2.10.90-6.el10_1.1, udisks2-iscsi-2.10.90-6.el10_1.1 +2
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libudisks2-devel-2.10.90-6.el10_1.1
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Advisory ·
Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support and 4 more products — RHSA-2026:3476
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2026-21098 Udisks: missing authorization check allows unprivileged users to back up luks headers via udisks d-bus apiPriority LOW 23
- Advisory ·
Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support and 4 more products — RHSA-2026:5831
2 records Highest priority Priority LOW 2 LOW
Other records, highest priority first
- TI-2026-21098 Udisks: missing authorization check allows unprivileged users to back up luks headers via udisks d-bus apiPriority LOW 23
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:3476 |
| Red Hat Enterprise Linux AppStream EUS (v. 10.0) | Fixed | RHSA-2026:5831 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) | Fixed | RHSA-2026:3476 |
| Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) | Fixed | RHSA-2026:5831 |
Not affected: 4 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2026-26103
- 2026-10-03 Alias added: GHSA-fw7p-cggr-9xm6
References
More Red Hat Enterprise Linux vulnerabilities
- TI-2019-08259 Underflow in PHP-FPM can lead to RCE KEVCVSS 3.1CRITICAL 9.8
- TI-2018-10530 Code injection in [UNKNOWN] RichFaces KEVCVSS 3.1CRITICAL 9.8
- TI-2014-05975 GNU Bash through 4.3 bash43-025 processes trailing strings after certain malformed… KEVCVSS 3.1CRITICAL 9.8
- TI-2014-05157 GNU Bash through 4.3 processes trailing strings after function definitions in the values… KEVCVSS 3.1CRITICAL 9.8
- TI-2025-23530 Sudo before 1.9.17p1 allows local users to obtain root access because /etc/nsswitch.conf… KEVCVSS 3.1CRITICAL 9.3
- TI-2021-17490 mod_proxy SSRF KEVCVSS 3.1CRITICAL 9.0
Sources
- CVE-2026-26103 · CVE Program
- CVE-2026-26103 · NVD
- FIRST EPSS
- GHSA-fw7p-cggr-9xm6 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-26103 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences