CVE-2026-77235 json
Missing privilege check in SecureContext_FreeContext in FreeRTOS-Kernel
published 2mo ago modified 28d ago also EUVD-2026-64013 , GHSA-55pf-q87x-c58c
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository FreeRTOS/FreeRTOS-Kernel. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 7.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 4%
- public exploits
- 0
- none known
Summary
Missing privilege verification in the secure context cleanup handler in FreeRTOS-Kernel before 11.3.1 might allow local users to cause a use-after-free condition in secure-world memory via the SVC handler for secure context deallocation. To remediate this issue, users should upgrade to version 11.3.1 or later.
Patch / fix
Is CVE-2026-77235 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2mo ago
Exploit prediction
0.16% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.3 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H |
| CNA | 4.0 | 8.3 | CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:H/SA:H |
| CNA | 4.0 | 8.3 | CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- FreeRTOS FreeRTOS-Kernel
Classification
- Weakness
-
- CWE-416 Use After Free
References
-
github.com
/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.1
patch, release-notes
-
aws.amazon.com
/security/security-bulletins/2026-086-aws/
vendor-advisory
-
github.com
/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-55pf-q87x-c58c
third-party-advisory, vendor-advisory, advisory
Sources
- CVE List CVE-2026-77235
- NVD CVE-2026-77235
- Maintainer advisory GHSA-55pf-q87x-c58c
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of FreeRTOS/FreeRTOS-Kernel published their own advisory on GitHub. Reviewed sources take precedence over it.