CVE-2026-44362

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1%, top 98% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
5.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.5Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on Arm; Cortex-A cores using the TrustZone technology. Starting in version 3.20.0 and prior to version 4.11.0, a vulnerability in OP-TEE’s subkey rollback protection allows the use of revoked or older subkey versions because the system fails to propagate versioning data during the Trusted Application (TA) loading process. In core/crypto/signed_hdr.c, the function shdr_load_pub_key() parses subkey headers but does not assign the subkey_version to the runtime shdr_pub_key structure. As a result, the key->version field remains at zero regardless of the version specified in the header. When ree_fs_ta_open() in core/kernel/ree_fs_ta.c calls check_update_version(), it passes this zeroed version to the rollback database. Because the database never receives a non-zero version to record, it never advances, effectively bypassing the rollback check and allowing TAs signed with downgraded subkey chains to load successfully. This impacts OP-TEE mainline configurations that utilize subkey-based signing chains for Trusted Application (TA) authentication. Version 4.11.0 contains a patch. No known workarounds are available.

CVSS v3
5.5
EG Score
5.5(medium)
EPSS
2.4%
KEV
Not listed

Published

July 6, 2026

Last Modified

July 7, 2026

Advisory Details (1)

Auto-updated Jul 7, 2026
Patch available. Sources: github.
github Patch Available

Subkey rollback protection can be bypassed with older subkey versions · Advisory · OP-TEE/optee_os · GitHub

https://github.com/OP-TEE/optee_os/security/advisories/GHSA-fhcg-pp56-8v75

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 13× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-12 16:01 UTCEG score recompute
  2. 2026-07-12 05:46 UTCEPSS rescore
  3. 2026-07-11 16:40 UTCEG score recompute
  4. 2026-07-11 08:27 UTCEPSS rescore
  5. 2026-07-10 17:19 UTCEG score recompute
  6. 2026-07-09 19:10 UTCEPSS rescore
  7. 2026-07-09 17:58 UTCEG score recompute
  8. 2026-07-08 18:36 UTCEG score recompute
  9. 2026-07-08 15:16 UTCEPSS rescore
  10. 2026-07-07 19:15 UTCEG score recompute
  11. 2026-07-07 13:46 UTCEPSS rescore
  12. 2026-07-06 19:47 UTCEG score recompute
  13. 2026-07-06 19:44 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-44362?
CVE-2026-44362 is a medium vulnerability published on July 6, 2026. OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on Arm; Cortex-A cores using the TrustZone technology. Starting in version 3.20.0 and prior to version 4.11.0, a vulnerability in OP-TEE’s subkey rollback protection allows the use of revoked…
When was CVE-2026-44362 disclosed?
CVE-2026-44362 was first published in the National Vulnerability Database on July 6, 2026, with the most recent update on July 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44362 actively exploited?
CVE-2026-44362 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-44362?
CVE-2026-44362 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-44362?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44362, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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